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{{Accessibility dispute|date=July 2023|reason=screen readers can not read flag icons}}
{{Use mdy dates|date=January 2017}}
{{Use American English|date=July 2023}}
{{TennisEventInfo|2009|US Open|
| logo=US Open tennis 2009 poster.jpg
| logo_size=250px
| date=August 31 – September 14
| edition=129th
| surface=Hardcourt
| category  = [[Grand Slam (tennis)|Grand Slam]] (ITF)
| location  = New York City, U.S.
| venue=[[USTA Billie Jean King National Tennis Center]]
| champms={{Flagicon|ARG}} [[Juan Martín del Potro]]
| champws={{Flagicon|BEL}} [[Kim Clijsters]]
| champmd={{Flagicon|CZE}} [[Lukáš Dlouhý]] / {{Flagicon|IND}} [[Leander Paes]]
| champwd={{Flagicon|USA}} [[Serena Williams]] / {{Flagicon|USA}} [[Venus Williams]]
| champxd={{Flagicon|USA}} [[Carly Gullickson]] / {{Flagicon|USA}} [[Travis Parrott]]
| champbs={{Flagicon|AUS}} [[Bernard Tomic]]
| champgs={{Flagicon|GBR}} [[Heather Watson]]
| champbd={{Flagicon|HUN}} [[Márton Fucsovics]] / {{Flagicon|TPE}} [[Hsieh Cheng-peng]]
| champgd={{Flagicon|RUS}} [[Valeria Solovieva]] / {{Flagicon|UKR}} [[Maryna Zanevska]]
| champwcms={{Flagicon|JPN}} [[Shingo Kunieda]]
| champwcws={{Flagicon|NED}} [[Esther Vergeer]]
| champwcqs={{Flagicon|GBR}} [[Peter Norfolk]]
| champwcmd={{Flagicon|FRA}} [[Stéphane Houdet]] / {{Flagicon|SWE}} [[Stefan Olsson]]
| champwcwd={{Flagicon|NED}} [[Korie Homan]] / {{Flagicon|NED}} [[Esther Vergeer]]
| champwcqd={{Flagicon|USA}} [[Nicholas Taylor (tennis)|Nicholas Taylor]] / {{Flagicon|USA}} [[David Wagner (tennis)|David Wagner]]

}}

The '''2009 US Open''' was a [[tennis]] tournament played on [[Hardcourt|outdoor hard courts]], held from August 31 to September 14, 2009, in the [[USTA Billie Jean King National Tennis Center]] at [[Flushing Meadows-Corona Park|Flushing Meadows]], New York City, United States. Originally, it was scheduled to end with the [[2009 US Open – Men's singles|men's singles]] final match on Sunday, September 13, but due to rain the tournament was extended by one day. Like the [[Australian Open]], the tournament featured night matches.

Former World No. 1 and [[2005 US Open (tennis)|2005 US Open]] [[2005 US Open – Women's singles|women's singles champion]], [[Kim Clijsters]], competed in the 2009 US Open<ref>{{cite news |author=usopen.org |title=Clijsters' comeback continues at the US Open |url=http://www.usopen.org/en_US/news/articles/2009-08-28/200908171250522269641.html |archive-url=https://web.archive.org/web/20090901180726/http://www.usopen.org/en_US/news/articles/2009-08-28/200908171250522269641.html |archive-date=September 1, 2009 |url-status=dead |access-date=September 6, 2009 |df=mdy-all }}</ref> after being granted a [[wild card (tennis)|wild card]] entry, returning to professional tennis after more than two years of retirement. She made it to the [[2009 US Open – Women's singles|women's singles]] semi-finals, where she knocked out the defending champion [[Serena Williams]] in [[Serena Williams#2009 US Open|controversial circumstances]]. In the final, Clijsters defeated [[Caroline Wozniacki]], the first [[Denmark|Dane]], man or woman, to reach a [[Grand Slam (tennis)|Grand Slam]] final in the [[Open Era]], in straight sets: 7–5, 6–3. Clijsters thus became the first mother to win a Grand Slam since [[Evonne Goolagong Cawley]] in 1980. In the process, she also became the first unseeded player and wildcard to win the tournament.

In the men's singles final, five-time defending champion [[Roger Federer]] lost to Argentina's [[Juan Martín del Potro]] in a match lasting over four hours.

== Arthur Ashe Kids' Day ==
The Arthur Ashe Kids' Day was held on August 29, 2009, prior to the start of the tournament. It featured an exhibition tennis match involving American player [[Andy Roddick]] and Great Britain's [[Andy Murray]], who were joined by actor and comedian [[Will Ferrell]]. ''[[American Idol]]'' winner [[Jordin Sparks]] performed her hit single "[[Battlefield (song)|Battlefield]]", along with rising stars [[Honor Society (band)|Honor Society]] and [[Justin Bieber]]. There were also tennis matches and contests featuring [[Serena Williams]], [[Ana Ivanovic]] [[Andy Roddick]], [[Roger Federer]], [[Maria Sharapova]], [[Kim Clijsters]], and [[James Blake (tennis)|James Blake]]. The popular tennis and music festival, which included interactive games, musical entertainment and tennis clinics, was hosted by television personalities [[Susie Castillo]] and [[Quddus (television personality)|Quddus]].<ref>{{cite web |title=The US Open 2009 - Grand Slam Tennis - Official Site by IBM |url=http://www.usopen.org/en_US/news/aakd.html?promo=leftnav |url-status=dead |access-date=September 6, 2009 |archive-url=https://web.archive.org/web/20090828165217/http://www.usopen.org/en_US/news/aakd.html?promo=leftnav |archive-date=August 28, 2009 |df=mdy-all }}</ref>

== Singles players ==
{{unreferenced section|date=June 2011}}

;[[2009 US Open – Men's singles|Men's singles]]
{| class="wikitable collapsible collapsed" style="font-size:90%"
|-
!colspan="2"|'''Champion'''
!colspan="2"|Runner-up
|-
| style="text-align:center;" colspan="2"|'''{{flagicon|ARG}} [[Juan Martín del Potro]] [6]'''
| style="text-align:center;" colspan="2"|{{flagicon|SUI}} [[Roger Federer]] [1]
|-
!colspan="4"|Semifinals out
|-
| style="text-align:center;" colspan="2"|{{flagicon|SRB|2004}} [[Novak Djokovic]] [4]
| style="text-align:center;" colspan="2"|{{flagicon|ESP}} [[Rafael Nadal]] [3]
|-
!colspan="4"|Quarterfinals out
|-
|{{flagicon|SWE}} [[Robin Söderling]] [12]
|{{flagicon|ESP}} [[Fernando Verdasco]] [10]
|{{flagicon|CHI}} [[Fernando González]] [11]
|{{flagicon|CRO}} [[Marin Čilić]] [16]
|-
!colspan="4"|4th round out
|-
|{{flagicon|ESP}} [[Tommy Robredo]] [14]
|{{flagicon|RUS}} [[Nikolay Davydenko]] [8]
|{{flagicon|CZE}} [[Radek Štěpánek]] [15]
|{{flagicon|USA}} [[John Isner]]
|-
|{{flagicon|FRA}} [[Jo-Wilfried Tsonga]] [7]
|{{flagicon|FRA}} [[Gaël Monfils]] [13]
|{{flagicon|ESP}} [[Juan Carlos Ferrero]] [24]
|{{flagicon|GBR}} [[Andy Murray]] [2]
|-
!colspan="4"|3rd round out
|-
|{{flagicon|AUS}} [[Lleyton Hewitt]] [31]
|{{flagicon|USA}} [[James Blake (tennis)|James Blake]] [21]
|{{flagicon|USA}} [[Sam Querrey]] [22]
|{{flagicon|SUI}} [[Marco Chiudinelli]] (Q)
|-
|{{flagicon|USA}} [[Jesse Witten]] (Q)
|{{flagicon|GER}} [[Philipp Kohlschreiber]] [23]
|{{flagicon|GER}} [[Tommy Haas]] [20]
|{{flagicon|USA}} [[Andy Roddick]] [5]
|-
|{{flagicon|FRA}} [[Julien Benneteau]]
|{{flagicon|CZE}} [[Tomáš Berdych]] [17]
|{{flagicon|ARG}} [[José Acasuso]]
|{{flagicon|ESP}} [[Nicolás Almagro]] [32]
|-
|{{flagicon|AUT}} [[Daniel Köllerer]]
|{{flagicon|FRA}} [[Gilles Simon]] [9]
|{{flagicon|UZB}} [[Denis Istomin]]
|{{flagicon|USA}} [[Taylor Dent]] (WC)
|-
!colspan="4"|2nd round out
|-
|{{flagicon|GER}} [[Simon Greul]]
|{{flagicon|ARG}} [[Juan Ignacio Chela]] (PR)
|{{flagicon|BEL}} [[Olivier Rochus]]
|{{flagicon|ESP}} [[Guillermo García López]]
|-
|{{flagicon|ESP}} [[Marcel Granollers]]
|{{flagicon|USA}} [[Kevin Kim]]
|{{flagicon|RUS}} [[Mikhail Youzhny]]
|{{flagicon|CZE}} [[Jan Hernych]]
|-
|{{flagicon|AUS}} [[Carsten Ball]] (Q)
|{{flagicon|ARG}} [[Máximo González]]
|{{flagicon|IND}} [[Somdev Devvarman]] (Q)
|{{flagicon|ARG}} [[Leonardo Mayer]]
|-
|{{flagicon|FRA}} [[Florent Serra]]
|{{flagicon|USA}} [[Robert Kendrick]]
|{{flagicon|TUR}} [[Marsel İlhan]] (Q)
|{{flagicon|FRA}} [[Marc Gicquel]]
|-
|{{flagicon|FIN}} [[Jarkko Nieminen]]
|{{flagicon|SRB|2004}} [[Viktor Troicki]] [30]
|{{flagicon|ARG}} [[Horacio Zeballos]] (Q)
|{{flagicon|FRA}} [[Josselin Ouanna]] (Q)
|-
|{{flagicon|GER}} [[Andreas Beck (tennis)|Andreas Beck]]
|{{flagicon|ESP}} [[David Ferrer]] [18]
|{{flagicon|USA}} [[Robby Ginepri]]
|{{flagicon|GER}} [[Nicolas Kiefer]]
|-
|{{flagicon|AUT}} [[Jürgen Melzer]]
|{{flagicon|URU}} [[Pablo Cuevas]]
|{{flagicon|GER}} [[Philipp Petzschner]]
|{{flagicon|BRA}} [[Thomaz Bellucci]] (Q)
|-
|{{flagicon|USA}} [[Jesse Levine]] (WC)
|{{flagicon|ECU}} [[Nicolás Lapentti]]
|{{flagicon|ESP}} [[Iván Navarro (tennis)|Iván Navarro]]
|{{flagicon|CHI}} [[Paul Capdeville]]
|-
!colspan="4"|1st round out
|-
|{{flagicon|USA}} [[Devin Britton]] (WC)
|{{flagicon|ECU}} [[Giovanni Lapentti]] (Q)
|{{flagicon|ESP}} [[Óscar Hernández (tennis)|Óscar Hernández]]
|{{flagicon|BRA}} [[Thiago Alves (tennis)|Thiago Alves]]
|-
|{{flagicon|ESP}} [[Rubén Ramírez Hidalgo]]
|{{flagicon|RUS}} [[Igor Kunitsyn]]
|{{flagicon|CAN}} [[Peter Polansky]] (Q)
|{{flagicon|USA}} [[Donald Young (tennis)|Donald Young]] (Q)
|-
|{{flagicon|ESP}} [[Albert Montañés]]
|{{flagicon|GER}} [[Mischa Zverev]]
|{{flagicon|ISR}} [[Dudi Sela]]
|{{flagicon|USA}} [[Michael Yani]] (Q)
|-
|{{flagicon|FRA}} [[Paul-Henri Mathieu]] [26]
|{{flagicon|ITA}} [[Potito Starace]]
|{{flagicon|GER}} [[Rainer Schüttler]]
|{{flagicon|GER}} [[Dieter Kindlmann]] (Q)
|-
|{{flagicon|CRO}} [[Ivan Ljubičić]]
|{{flagicon|ARG}} [[Juan Pablo Brzezicki]] (Q)
|{{flagicon|SVK}} [[Karol Beck]]
|{{flagicon|RUS}} [[Igor Andreev]] [29]
|-
|{{flagicon|ITA}} [[Andreas Seppi]]
|{{flagicon|POR}} [[Fred Gil]]
|{{flagicon|KAZ}} [[Andrey Golubev]]
|{{flagicon|ITA}} [[Simone Bolelli]]
|-
|{{flagicon|GER}} [[Benjamin Becker]]
|{{flagicon|SRB|2004}} [[Janko Tipsarević]]
|{{flagicon|ARG}} [[Martín Vassallo Argüello]]
|{{flagicon|COL}} [[Alejandro Falla]] (Q)
|-
|{{flagicon|ROM}} [[Victor Hănescu]] [28]
|{{flagicon|BEL}} [[Christophe Rochus]]
|{{flagicon|RUS}} [[Dmitry Tursunov]]
|{{flagicon|GER}} [[Björn Phau]]
|-
|{{flagicon|USA}} [[Chase Buchanan]] (WC)
|{{flagicon|ITA}} [[Fabio Fognini]]
|{{flagicon|ITA}} [[Flavio Cipolla]]
|{{flagicon|AUS}} [[Peter Luczak]] (LL)
|-
|{{flagicon|USA}} [[Wayne Odesnik]]
|{{flagicon|GER}} [[Michael Berrer]] (Q)
|{{flagicon|USA}} [[Rajeev Ram]]
|{{flagicon|CHI}} [[Nicolás Massú]]
|-
|{{flagicon|FRA}} [[Jérémy Chardy]]
|{{flagicon|RUS}} [[Evgeny Korolev]]
|{{flagicon|BRA}} [[Marcos Daniel]]
|{{flagicon|ESP}} [[Alberto Martín]]
|-
|{{flagicon|BEL}} [[Steve Darcis]]
|{{flagicon|ROU}} [[Andrei Pavel]] (PR)
|{{flagicon|FRA}} [[Michaël Llodra]] (WC)
|{{flagicon|FRA}} [[Richard Gasquet]]
|-
|{{flagicon|ARG}} [[Juan Mónaco]]
|{{flagicon|RUS}} [[Marat Safin]]
|{{flagicon|AUS}} [[Chris Guccione (tennis)|Chris Guccione]] (WC)
|{{flagicon|POR}} [[Rui Machado]] (LL)
|-
|{{flagicon|FRA}} [[Fabrice Santoro]]
|{{flagicon|UKR}} [[Sergiy Stakhovsky]]
|{{flagicon|TPE}} [[Lu Yen-hsun]]
|{{flagicon|ESP}} [[Daniel Gimeno Traver]]
|-
|{{flagicon|USA}} [[Ryan Sweeting]] (WC)
|{{flagicon|RUS}} [[Teymuraz Gabashvili]]
|{{flagicon|USA}} [[Brendan Evans]] (WC)
|{{flagicon|SUI}} [[Stan Wawrinka]] [19]
|-
|{{flagicon|CRO}} [[Ivo Karlović]] [27]
|{{flagicon|ESP}} [[Feliciano López]]
|{{flagicon|ROU}} [[Victor Crivoi]]
|{{flagicon|LAT}} [[Ernests Gulbis]]
|}

;[[2009 US Open – Women's singles|Women's singles]]
{| class="wikitable collapsible collapsed" style="font-size:90%"
|-
!colspan="2"|'''Champion'''
!colspan="2"|Runner-up
|-
| style="text-align:center;" colspan="2"|{{flagicon|BEL}} '''[[Kim Clijsters]] (WC)'''
| style="text-align:center;" colspan="2"|{{flagicon|DEN}} [[Caroline Wozniacki]] [9]
|-
!colspan="4"|Semifinals out
|-
| style="text-align:center;" colspan="2"|{{flagicon|BEL}} [[Yanina Wickmayer]]
| style="text-align:center;" colspan="2"|{{flagicon|USA}} [[Serena Williams]] [2]
|-
!colspan="4"|Quarterfinals out
|-
|{{flagicon|UKR}} [[Kateryna Bondarenko]]
|{{flagicon|USA}} [[Melanie Oudin]]
|{{flagicon|CHN}} [[Li Na]] [18]
|{{flagicon|ITA}} [[Flavia Pennetta]] [10]
|-
!colspan="4"|4th round out
|-
|{{flagicon|CZE}} [[Petra Kvitová]]
|{{flagicon|ARG}} [[Gisela Dulko]]
|{{flagicon|RUS}} [[Nadia Petrova]] [13]
|{{flagicon|RUS}} [[Svetlana Kuznetsova]] [6]
|-
|{{flagicon|ITA}} [[Francesca Schiavone]] [26]
|{{flagicon|USA}} [[Venus Williams]] [3]
|{{flagicon|RUS}} [[Vera Zvonareva]] [7]
|{{flagicon|SVK}} [[Daniela Hantuchová]] [22]
|-
!colspan="4"|3rd round out
|-
|{{flagicon|RUS}} [[Dinara Safina]] [1]
|{{flagicon|ITA}} [[Sara Errani]]
|{{flagicon|AUS}} [[Anastasia Rodionova]] (Q)
|{{flagicon|KAZ}} [[Yaroslava Shvedova]]
|-
|{{flagicon|RUS}} [[Maria Sharapova]] [29]
|{{flagicon|CHN}} [[Zheng Jie]] [21]
|{{flagicon|ROU}} [[Sorana Cîrstea]] [24]
|{{flagicon|ISR}} [[Shahar Pe'er]]
|-
|{{flagicon|BLR|1995}} [[Victoria Azarenka]] [8]
|{{flagicon|RUS}} [[Maria Kirilenko]]
|{{flagicon|BEL}} [[Kirsten Flipkens]]
|{{flagicon|SVK}} [[Magdaléna Rybáriková]]
|-
|{{flagicon|RUS}} [[Elena Vesnina]] [31]
|{{flagicon|CAN}} [[Aleksandra Wozniak]]
|{{flagicon|USA}} [[Vania King]] (WC)
|{{flagicon|ESP}} [[María José Martínez Sánchez]]
|-
!colspan="4"|2nd round out
|-
|{{flagicon|GER}} [[Kristina Barrois]]
|{{flagicon|ITA}} [[Tathiana Garbin]]
|{{flagicon|SUI}} [[Patty Schnyder]] [19]
|{{flagicon|CHN}} [[Peng Shuai]]
|-
|{{flagicon|USA}} [[Shenay Perry]] (Q)
|{{flagicon|GER}} [[Sabine Lisicki]] [23]
|{{flagicon|UKR}} [[Alona Bondarenko]] [30]
|{{flagicon|SRB|2004}} [[Jelena Janković]] [5]
|-
|{{flagicon|RUS}} [[Elena Dementieva]] [4]
|{{flagicon|ESP}} [[Carla Suárez Navarro]]
|{{flagicon|FRA}} [[Alizé Cornet]]
|{{flagicon|FRA}} [[Julie Coin]]
|-
|{{flagicon|CRO}} [[Petra Martić]] (Q)
|{{flagicon|CAN}} [[Stéphanie Dubois]]
|{{flagicon|USA}} [[Christina McHale]] (WC)
|{{flagicon|LAT}} [[Anastasija Sevastova]]
|-
|{{flagicon|CZE}} [[Barbora Strýcová|Barbora Záhlavová-Strýcová]] (Q)
|{{flagicon|SUI}} [[Stefanie Vögele]]
|{{flagicon|POR}} [[Michelle Larcher de Brito]]
|{{flagicon|POL}} [[Agnieszka Radwańska]] [12]
|-
|{{flagicon|FRA}} [[Marion Bartoli]] [14]
|{{flagicon|ESP}} [[Anabel Medina Garrigues]] [20]
|{{flagicon|TPE}} [[Chang Kai-chen]] (Q)
|{{flagicon|USA}} [[Bethanie Mattek-Sands]]
|-
|{{flagicon|RUS}} [[Anna Chakvetadze]]
|{{flagicon|USA}} [[Jill Craybas]]
|{{flagicon|FRA}} [[Amélie Mauresmo]] [17]
|{{flagicon|IND}} [[Sania Mirza]]
|-
|{{flagicon|AUS}} [[Samantha Stosur]] [15]
|{{flagicon|SUI}} [[Timea Bacsinszky]]
|{{flagicon|GER}} [[Angelique Kerber]] (Q)
|{{flagicon|HUN}} [[Melinda Czink]]
|-
!colspan="4"|1st round out
|-
|{{flagicon|AUS}} [[Olivia Rogowska]] (WC)
|{{flagicon|POL}} [[Urszula Radwańska]]
|{{flagicon|USA}} [[Mallory Cecil]] (WC)
|{{flagicon|RUS}} [[Alisa Kleybanova]] [27]
|-
|{{flagicon|CZE}} [[Lucie Šafářová]]
|{{flagicon|NED}} [[Arantxa Rus]]
|{{flagicon|AUS}} [[Jarmila Wolfe|Jarmila Groth]]
|{{flagicon|FRA}} [[Virginie Razzano]] [16]
|-
|{{flagicon|SRB|2004}} [[Ana Ivanovic]] [11]
|{{flagicon|ROU}} [[Monica Niculescu]]
|{{flagicon|ESP}} [[Lourdes Domínguez Lino]]
|{{flagicon|FRA}} [[Aravane Rezaï]]
|-
|{{flagicon|RUS}} [[Alla Kudryavtseva]]
|{{flagicon|RUS}} [[Ekaterina Makarova]]
|{{flagicon|SLO}} [[Maša Zec Peškirič]]
|{{flagicon|ITA}} [[Roberta Vinci]]
|-
|{{flagicon|FRA}} [[Camille Pin]] (Q)
|{{flagicon|RUS}} [[Anastasia Pavlyuchenkova]]
|{{flagicon|SLO}} [[Polona Hercog]]
|{{flagicon|BUL}} [[Tsvetana Pironkova]]
|-
|{{flagicon|GER}} [[Anna-Lena Grönefeld]]
|{{flagicon|AUS}} [[Monique Adamczak]] (Q)
|{{flagicon|CZE}} [[Eva Hrdinová]] (Q)
|{{flagicon|SLO}} [[Katarina Srebotnik]]
|-
|{{flagicon|KAZ}} [[Galina Voskoboeva]]
|{{flagicon|FRA}} [[Séverine Beltrame|Séverine Brémond Beltrame]]
|{{flagicon|FRA}} [[Kristina Mladenovic]] (WC)
|{{flagicon|JPN}} [[Ayumi Morita]]
|-
|{{flagicon|HUN}} [[Ágnes Szávay]] [32]
|{{flagicon|USA}} [[Varvara Lepchenko]]
|{{flagicon|THA}} [[Tamarine Tanasugarn]]
|{{flagicon|GER}} [[Julia Görges]]
|-
|{{flagicon|ROM}} [[Alexandra Dulgheru]]
|{{flagicon|POL}} [[Marta Domachowska]] (Q)
|{{flagicon|ITA}} [[Alberta Brianti]]
|{{flagicon|AUT}} [[Yvonne Meusburger]] (Q)
|-
|{{flagicon|ROM}} [[Raluca Olaru]]
|{{flagicon|FRA}} [[Mathilde Johansson]]
|{{flagicon|UKR}} [[Mariya Koryttseva]] (Q)
|{{flagicon|AUT}} [[Patricia Mayr-Achleitner|Patricia Mayr]]
|-
|{{flagicon|PAR}} [[Rossana de los Ríos]]
|{{flagicon|UKR}} [[Viktoriya Kutuzova]]
|{{flagicon|AUS}} [[Jelena Dokić]]
|{{flagicon|USA}} [[Gail Brodsky]] (WC)
|-
|{{flagicon|EST}} [[Kaia Kanepi]] [25]
|{{flagicon|CAN}} [[Valérie Tétreault]] (Q)
|{{flagicon|CZE}} [[Iveta Benešová]]
|{{flagicon|RUS}} [[Vera Dushevina]]
|-
|{{flagicon|ESP}} [[Nuria Llagostera Vives]]
|{{flagicon|JPN}} [[Yurika Sema]] (Q)
|{{flagicon|USA}} [[Carly Gullickson]] (Q)
|{{flagicon|CZE}} [[Lucie Hradecká]]
|-
|{{flagicon|GER}} [[Tatjana Maria|Tatjana Malek]]
|{{flagicon|USA}} [[Laura Granville]] (PR)
|{{flagicon|BLR|1995}} [[Olga Govortsova]]
|{{flagicon|ROM}} [[Edina Gallovits-Hall|Edina Gallovits]]
|-
|{{flagicon|JPN}} [[Ai Sugiyama]]
|{{flagicon|BLR|1995}} [[Anastasiya Yakimova]]
|{{flagicon|RUS}} [[Vesna Dolonc|Vesna Manasieva]] (Q)
|{{flagicon|USA}} [[Meghann Shaughnessy]] (PR)
|-
|{{flagicon|AUT}} [[Sybille Bammer]] [28]
|{{flagicon|GER}} [[Andrea Petkovic]]
|{{flagicon|ITA}} [[Maria Elena Camerin]]
|{{flagicon|USA}} [[Alexa Glatch]] (WC)
|}

== Player of the day ==
* Day 1: '''{{Flagicon|BEL}} [[Kim Clijsters]]''', for winning her first match at the US Open in 4 years.<ref>{{cite web|title=Player of the Day: Day 1 |work=usopen.org |url=http://www.usopen.org/en_US/news/playerday/20090831.html |date=August 31, 2009 |access-date=September 14, 2009 |url-status=dead |archive-url=https://web.archive.org/web/20090905162428/http://www.usopen.org/en_US/news/playerday/20090831.html |archive-date=September 5, 2009 }}</ref>
* Day 2: '''{{Flagicon|USA}} [[Jesse Witten]]''', for defeating 29th-seeded {{Flagicon|RUS}} [[Igor Andreev]] 6–4, 6–0, 6–2 his first career win at a Grand Slam at the age of 26 and ranked 276.<ref>{{cite web|title=Player of the Day: Day 2 |work=usopen.org |url=http://www.usopen.org/en_US/news/playerday/20090901.html |date=September 1, 2009 |access-date=September 14, 2009 |url-status=dead |archive-url=https://web.archive.org/web/20090905162433/http://www.usopen.org/en_US/news/playerday/20090901.html |archive-date=September 5, 2009 }}</ref>
* Day 3: '''{{Flagicon|ITA}} [[Flavia Pennetta]]''', for defeating {{Flagicon|IND}} [[Sania Mirza]] 6–0, 6–0, which was her third consecutive 6–0 set.<ref>{{cite web|title=Player of the Day: Day 3 |work=usopen.org |url=http://www.usopen.org/en_US/news/playerday/20090902.html |date=September 2, 2009 |access-date=September 14, 2009 |url-status=dead |archive-url=https://web.archive.org/web/20090906064009/http://www.usopen.org/en_US/news/playerday/20090902.html |archive-date=September 6, 2009 }}</ref>
* Day 4: '''{{Flagicon|USA}} [[Melanie Oudin]]''', ranked 70th, for eliminating world #4 {{Flagicon|RUS}} [[Elena Dementieva]], after losing the first set and overcoming a thigh injury to win the final set.<ref>{{cite web|title=Player of the Day: Day 4 |work=usopen.org |url=http://www.usopen.org/en_US/news/playerday/20090903.html |date=September 3, 2009 |access-date=September 14, 2009 |url-status=dead |archive-url=https://web.archive.org/web/20090908152620/http://www.usopen.org/en_US/news/playerday/20090903.html |archive-date=September 8, 2009 }}</ref>
* Day 5: '''{{Flagicon|ITA}} [[Francesca Schiavone]]''', for defeating #8 seed {{Flagicon|BLR|1995}} [[Victoria Azarenka]] despite losing the first set.<ref>{{cite web|title=Player of the Day: Day 5 |work=usopen.org |url=http://www.usopen.org/en_US/news/playerday/20090904.html |date=September 4, 2009 |access-date=September 14, 2009 |url-status=dead |archive-url=https://web.archive.org/web/20090910071116/http://www.usopen.org/en_US/news/playerday/20090904.html |archive-date=September 10, 2009 }}</ref>
* Day 6: '''{{Flagicon|USA}} [[Melanie Oudin]]''', for defeating former world #1 and the 29th seed {{Flagicon|RUS}} [[Maria Sharapova]], losing the first set and winning 7–5 in the third.<ref>{{cite web|title=Player of the Day: Day 6 |work=usopen.org |url=http://www.usopen.org/en_US/news/playerday/20090905.html |date=September 5, 2009 |access-date=September 14, 2009 |url-status=dead |archive-url=https://web.archive.org/web/20090910071121/http://www.usopen.org/en_US/news/playerday/20090905.html |archive-date=September 10, 2009 }}</ref>
* Day 7: '''{{Flagicon|FRA}} [[Jo-Wilfried Tsonga]]''', For reaching the round of 16 for the first time, and for not dropping a set to this point.<ref>{{cite web|title=Player of the Day: Day 7 |work=usopen.org |url=http://www.usopen.org/en_US/news/playerday/20090906.html |date=September 6, 2009 |access-date=September 14, 2009 |url-status=dead |archive-url=https://web.archive.org/web/20090910101717/http://www.usopen.org/en_US/news/playerday/20090906.html |archive-date=September 10, 2009 }}</ref>
* Day 8: '''{{Flagicon|UKR}} [[Kateryna Bondarenko]]''', for beating {{Flagicon|ARG}} [[Gisela Dulko]] in only 47 minutes 6–0, 6–0, advancing to her first grand slam quarterfinal.<ref>{{cite web|title=Player of the Day: Day 8 |work=usopen.org |url=http://www.usopen.org/en_US/news/playerday/20090907.html |date=September 7, 2009 |access-date=September 14, 2009 |url-status=dead |archive-url=https://web.archive.org/web/20090912055155/http://www.usopen.org/en_US/news/playerday/20090907.html |archive-date=September 12, 2009 }}</ref>
* Day 9: '''{{Flagicon|CRO}} [[Marin Čilić]]''', for defeating ATP No. 2 {{Flagicon|GBR}} [[Andy Murray]] in three sets.<ref>{{cite web|title=Player of the Day: Day 9 |work=usopen.org |url=http://www.usopen.org/en_US/news/playerday/20090908.html |date=September 8, 2009 |access-date=September 14, 2009 |url-status=dead |archive-url=https://web.archive.org/web/20090912115330/http://www.usopen.org/en_US/news/playerday/20090908.html |archive-date=September 12, 2009 }}</ref>
* Day 10: '''{{Flagicon|BEL}} [[Yanina Wickmayer]]''', for defeating {{Flagicon|UKR}} [[Kateryna Bondarenko]] in straight sets and becoming the second Belgian player in the semifinals.<ref>{{cite web|title=Player of the Day: Day 10 |work=usopen.org |url=http://www.usopen.org/en_US/news/playerday/20090909.html |date=September 9, 2009 |access-date=September 14, 2009 |url-status=dead |archive-url=https://web.archive.org/web/20090913221102/http://www.usopen.org/en_US/news/playerday/20090909.html |archive-date=September 13, 2009 }}</ref>
* Day 11: '''{{Flagicon|ARG}} [[Juan Martín del Potro]]''', for defeating {{Flagicon|CRO}} [[Marin Čilić]] in four sets to advance to the semifinals of the US Open for the first time.<ref>{{cite web |title=Player of the Day: Day 11 |work=usopen.org |url=http://www.usopen.org/en_US/news/playerday/20090910.html |date=September 10, 2009 |access-date=September 14, 2009 |archive-url=https://web.archive.org/web/20090914041725/http://www.usopen.org/en_US/news/playerday/20090910.html |archive-date=September 14, 2009 |url-status=dead |df=mdy-all }}</ref>
* Day 12: ''[[#Day 12 (September 11)|No matches played due to rain]].''
* Day 13: '''{{Flagicon|DEN}} [[Caroline Wozniacki]]''', for beating {{Flagicon|BEL}} [[Yanina Wickmayer]] 6–3, 6–3 in the semifinals, thus becoming the first Dane, man or woman, to reach a Grand Slam final in the [[Open Era]].<ref>{{cite web |title=Player of the Day: Day 13 |work=usopen.org |url=http://www.usopen.org/en_US/news/playerday/20090912.html |date=September 12, 2009 |access-date=September 14, 2009 |archive-url=https://web.archive.org/web/20090915234252/http://www.usopen.org/en_US/news/playerday/20090912.html |archive-date=September 15, 2009 |url-status=dead |df=mdy-all }}</ref>
* Day 14: '''{{Flagicon|SUI}} [[Roger Federer]]''', for beating {{Flagicon|SRB|2004}} [[Novak Djokovic]] in the semifinals 7–6<sup>(7–3)</sup>, 7–5, 7–5, thus reaching his 21st Grand Slam and 6th consecutive [[US Open (tennis)|US Open]] final.<ref>{{cite web |title=Player of the Day: Day 14 |url=http://www.usopen.org/en_US/news/playerday/20090913.html |work=usopen.org |date=September 13, 2009 |access-date=September 14, 2009 |archive-url=https://web.archive.org/web/20090922221025/http://www.usopen.org/en_US/news/playerday/20090913.html |archive-date=September 22, 2009 |url-status=dead |df=mdy-all }}</ref>
* Day 15: '''{{Flagicon|ARG}} [[Juan Martín del Potro]]''', for winning his first Grand Slam title, ending {{Flagicon|SUI}} [[Roger Federer]]'s streak of consecutive US Open championships at five.<ref>{{cite web |title=Player of the Day: Day 15 |work=usopen.org |url=http://www.usopen.org/en_US/news/playerday/20090914.html |date=September 14, 2009 |access-date=September 14, 2009 |archive-url=https://web.archive.org/web/20090922221030/http://www.usopen.org/en_US/news/playerday/20090914.html |archive-date=September 22, 2009 |url-status=dead |df=mdy-all }}</ref>

== Day-by-day summaries ==

=== Day 1 (August 31) ===
[[File:Simon-greul.png|thumb|[[Simon Greul]] serving to [[Giovanni Lapentti]] in Round 1|175px]]
The first day of the tournaments saw many seeds get through pretty easily in straight sets: [[Roger Federer]], [[James Blake (tennis)|James Blake]], [[Lleyton Hewitt]], [[Nikolay Davydenko]] and [[Radek Štěpánek]]. The day also produced a couple of upsets, when [[Mikhail Youzhny]] continued 26th seeded [[Paul-Henri Mathieu]]'s horrible US Open record by beating him in four. While, tall American [[John Isner]] did the same to 28th seeded [[Victor Hănescu]] by ending the Romanian's 2009 bid in three with the second set going to a tie-break 16–14. The exciting day continued with a couple of five-set marathons, with [[Simon Greul]] defeating [[Giovanni Lapentti]], [[Guillermo García López]] out-lasting [[Peter Polansky]], and [[Jan Hernych]] surviving against [[Rainer Schüttler]]. The days last match featured America's hope [[Andy Roddick]] prevailing over [[Björn Phau]] in straight sets in a match that started at 11:00 pm.<ref>{{cite news|url=http://www.nydailynews.com/sports/more_sports/2009/09/01/2009-09-01_andy_roddick.html |title=Roddick show improve form |archive-url=https://web.archive.org/web/20090904200921/http://www.nydailynews.com/sports/more_sports/2009/09/01/2009-09-01_andy_roddick.html |archive-date=September 4, 2009 |url-status=live |access-date=September 6, 2009 |location=New York |work=Daily News |first=Wayne |last=Coffey |date=September 1, 2009 }}</ref>

[[File:Venus at us open 2009.jpg|thumb|left|[[Venus Williams]] returns against [[Vera Dushevina]] on the opening day|175px]]
On the women's side, former world no. 1 [[Kim Clijsters]] opened the play, winning over [[Viktoriya Kutuzova]] losing only two games. Joining her were defending [[2009 Wimbledon]] and [[Australian Open]] champion [[Serena Williams]], [[Amélie Mauresmo]], [[Victoria Azarenka]], [[Flavia Pennetta]], [[Elena Vesnina]], [[Agnieszka Radwańska]], [[Li Na]] and [[Marion Bartoli]] who all won in two sets. Australian [[Samantha Stosur]] was pushed by veteran player [[Ai Sugiyama]] in three sets, [[Daniela Hantuchová]] got past American [[Meghann Shaughnessy]] in three as well. In the first night match, [[Venus Williams]] was able to claw her way to avoid an upset to win against Russian [[Vera Dushevina]] in a very close three-setter. Venus committed four foot faults in the match.<ref>{{cite web |url=http://nbcsports.msnbc.com/id/32628812/ns/sports-tennis/ |title=Venus struggles in opener |archive-url=https://web.archive.org/web/20090903035510/http://nbcsports.msnbc.com/id/32628812/ns/sports-tennis |archive-date=September 3, 2009 |url-status=dead |access-date=September 6, 2009 }}</ref> With Venus and Serena getting past the first round, a few American players saw success on the women's side with [[Vania King]], [[Bethanie Mattek-Sands]], and [[Jill Craybas]] getting to the second round. Austrian and 28th seeded [[Sybille Bammer]], who defeated [[Serena Williams]] in Cincinnati, and 25th seeded [[Kaia Kanepi]] were the only casualties of the day.
{{Clear}}

* Seeds out:
** [[2009 US Open – Men's singles|Men's singles]]: {{Flagicon|FRA}} [[Paul-Henri Mathieu]] [26], {{Flagicon|ROU}} [[Victor Hănescu]] [28]
** [[2009 US Open – Women's singles|Women's singles]]: {{Flagicon|EST}} [[Kaia Kanepi]] [25], {{Flagicon|AUT}} [[Sybille Bammer]] [28]
* [https://web.archive.org/web/20090904112356/http://www.usopen.org/en_US/scores/schedule/schedule7.html Schedule of play]

<div style="text-align: center;">
{| class="wikitable collapsible uncollapsed"
! colspan=4|{{Nowrap|'''Matches on main courts'''<ref>{{cite web|url=http://www.usopen.org/en_US/scores/schedule/schedule7.html |title=Day 1 Schedule |access-date=September 12, 2009 |publisher=USOpen |archive-url=https://web.archive.org/web/20090904112356/http://www.usopen.org/en_US/scores/schedule/schedule7.html |archive-date=September 4, 2009 |url-status=live }}</ref>}}
|-
! colspan=4|'''Matches on [[Arthur Ashe Stadium]]'''
|-
! Event
! Winner
! Loser
! Score
|- align=left
| [[2009 US Open – Women's singles#Section 6|Women's singles – 1st round]]
| {{Flagicon|BEL}} '''[[Kim Clijsters]] [WC]'''
| {{Flagicon|UKR}} [[Viktoriya Kutuzova]]
| 6–1, 6–1
|- align=left
| [[2009 US Open – Men's singles#Section 1|Men's singles – 1st round]]
| {{Flagicon|SUI}} '''[[Roger Federer]] [1]'''
| {{Flagicon|USA}} [[Devin Britton]] [WC]
| 6–1, 6–3, 7–5
|- align=left
| [[2009 US Open – Women's singles#Section 8|Women's singles – 1st round]]
| {{Flagicon|USA}} '''[[Serena Williams]] [2]'''
| {{Flagicon|USA}} [[Alexa Glatch]] [WC]
| 6–4, 6–1
|-
! colspan="4" align="center"|''2009 US Open Opening Night Ceremony''
|-  style="text-align:left; background:lavender;"
| [[2009 US Open – Women's singles#Section 6|Women's singles – 1st round]]
| {{Flagicon|USA}} '''[[Venus Williams]] [3]'''
| {{Flagicon|RUS}} [[Vera Dushevina]]
| 6–7<sup>(5–7)</sup>, 7–5, 6–3
|-  style="text-align:left; background:lavender;"
| [[2009 US Open – Men's singles#Section 4|Men's singles – 1st round]]
| {{Flagicon|USA}} '''[[Andy Roddick]] [5]'''
| {{Flagicon|GER}} [[Björn Phau]]
| 6–1, 6–4, 6–2
|-
! colspan=4|'''Matches on [[Louis Armstrong Stadium]]'''
|-
! Event
! Winner
! Loser
! Score
|- align=left
| [[2009 US Open – Women's singles#Section 5|Women's singles – 1st round]]
| {{Flagicon|BLR|1995}} '''[[Victoria Azarenka]] [8]'''
| {{Flagicon|ROU}} [[Alexandra Dulgheru]]
| 6–1, 6–1
|- align=left
| [[2009 US Open – Men's singles#Section 4|Men's singles – 1st round]]
| {{Flagicon|USA}} '''[[John Isner]]'''
| {{Flagicon|ROU}} [[Victor Hănescu]] [28]
| 6–1, 7–6<sup>(16–14)</sup>, 7–6<sup>(7–5)</sup>
|- align=left
| [[2009 US Open – Women's singles#Section 7|Women's singles – 1st round]]
| {{Flagicon|FRA}} '''[[Amélie Mauresmo]] [17]'''
| {{Flagicon|GER}} [[Tatjana Maria|Tatjana Malek]]
| 6–3, 6–4
|- align=left
| [[2009 US Open – Men's singles#Section 1|Men's singles – 1st round]]
| {{Flagicon|USA}} '''[[James Blake (tennis)|James Blake]] [21]'''
| {{Flagicon|ESP}} [[Rubén Ramírez Hidalgo]]
| 6–1, 6–4, 7–5
|- align=left
| [[2009 US Open – Women's singles#Section 8|Women's singles – 1st round]]
| {{Flagicon|SVK}} '''[[Daniela Hantuchová]] [22]'''
| {{Flagicon|USA}} [[Meghann Shaughnessy]] [PR]
| 6–2, 4–6, 6–1
|-
! colspan=4|'''Matches on the Grandstand'''
|-
! Event
! Winner
! Loser
! Score
|- align=left
| [[2009 US Open – Men's singles#Section 2|Men's singles – 1st round]]
| {{Flagicon|RUS}} '''[[Mikhail Youzhny]]'''
| {{Flagicon|FRA}} [[Paul-Henri Mathieu]] [26]
| 2–6, 7–5, 6–0, 6–2
|- align=left
| [[2009 US Open – Women's singles#Section 7|Women's singles – 1st round]]
| {{Flagicon|ITA}}  '''[[Flavia Pennetta]]'''
| {{Flagicon|ROU}} [[Edina Gallovits-Hall|Edina Gallovits]]
| 6–0, 6–4
|- align=left
| [[2009 US Open – Women's singles#Section 7|Women's singles – 1st round]]
| {{Flagicon|RUS}} '''[[Vera Zvonareva]] [7]'''
| {{Flagicon|ESP}} [[Nuria Llagostera Vives]]
| 6–0, 6–4
|- align=left
| [[2009 US Open – Men's singles#Section 1|Men's singles – 1st round]]
| {{Flagicon|AUS}} '''[[Lleyton Hewitt]] [31]'''
| {{Flagicon|BRA}} [[Thiago Alves (tennis)|Thiago Alves]]
| 6–0, 6–3, 6–4
|-
! colspan=4|''Colored background indicates a night match''
|}
</div>

=== Day 2 (September 1) ===
On the men's side, many seeded players got through in straight sets: 2008 US Open runner-up [[Andy Murray]], [[2008 Australian Open]] Champion [[Novak Djokovic]], [[Tomáš Berdych]], [[Jo-Wilfried Tsonga]], [[Fernando González]], and [[Fernando Verdasco]]. No. 30 seed [[Victor Troicki]] survived a five-set scare, 6–3, 6–3, 1–6, 2–6, 6–1. However, some seeds failed to be as lucky and fell in the first round with [[Ivo Karlović]] falling to [[Iván Navarro (tennis)|Iván Navarro]] and [[Igor Andreev]] falling to American [[Jesse Witten]], both in straight sets, while [[Stan Wawrinka]] fell in five. American players were once again successful, with 5 out of the 11 getting past the first round: [[Sam Querrey]], [[Kevin Kim]], [[Jesse Witten]], [[Jesse Levine]], and [[Taylor Dent]].

On the women's side, the first major upset of the tournament occurred with Ukrainian [[Kateryna Bondarenko]] upsetting 11th seed and former world no. 1 [[Ana Ivanovic]]. Ivanovic committed 50 unforced errors. In the second round, her sister [[Alona Bondarenko]], [[2009 French Open]] champion [[Svetlana Kuznetsova]], [[Maria Sharapova]], [[Elena Dementieva]], [[Nadia Petrova]] and [[Tathiana Garbin]] all advanced. Other seeded players that were eliminated in the first round were 32nd seed [[Ágnes Szávay]], losing to Israeli [[Shahar Pe'er]] in straight sets, [[Alisa Kleybanova]], losing to [[Petra Kvitová]] in three and [[Virginie Razzano]] losing to [[Yanina Wickmayer]] in straight sets. Day 2 was a good day for women American players with three out of five getting through: [[Melanie Oudin]], [[Shenay Perry]], and [[Christina McHale]]. However, world no. 1 [[Dinara Safina]] struggled in her match against [[Olivia Rogowska]] but manage to survive, winning in three sets<ref>{{Cite news|author=latimes.com |title=Safina struggles |url=http://www.latimes.com/sports/la-spw-us-open2-2009sep02,0,1414099.story |url-status=dead |archive-url=https://web.archive.org/web/20090904144133/http://www.latimes.com/sports/la-spw-us-open2-2009sep02%2C0%2C1414099.story |archive-date=September 4, 2009 }}</ref>

On the doubles side, the day was led by 2nd seeded [[Daniel Nestor]] and [[Nenad Zimonjić]], who won in straight sets, and the only seeds that were eliminated were No. 15 seed [[Stephen Huss (tennis)|Stephen Huss]] and [[Ross Hutchins]].

* Seeds out:
** [[2009 US Open – Men's singles|Men's singles]]: {{Flagicon|SUI}} [[Stan Wawrinka]] [19], {{Flagicon|CRO}} [[Ivo Karlović]] [27], {{Flagicon|RUS}} [[Igor Andreev]] [29]
** [[2009 US Open – Women's singles|Women's singles]]: {{Flagicon|SRB|2004}} [[Ana Ivanovic]] [11], {{flagicon|FRA}} [[Virginie Razzano]] [16], {{Flagicon|RUS}} [[Alisa Kleybanova]] [27], {{Flagicon|HUN}} [[Ágnes Szávay]] [32]
** [[2009 US Open – Men's doubles|Men's doubles]]: {{Flagicon|AUS}} [[Stephen Huss (tennis)|Stephen Huss]] / {{Flagicon|GBR}} [[Ross Hutchins]] [15]
* [https://web.archive.org/web/20090904093552/http://www.usopen.org/en_US/scores/schedule/schedule8.html Schedule of play]

<div style="text-align: center;">
{| class="wikitable collapsible uncollapsed"
! colspan=4|{{Nowrap|'''Matches on main courts'''<ref>{{cite web|url=http://www.usopen.org/en_US/scores/schedule/schedule8.html|title=Day 2 Schedule|access-date=September 12, 2009|publisher=USOpen}}</ref>}}
|-
! colspan=4|'''Matches on [[Arthur Ashe Stadium]]'''
|-
! Event
! Winner
! Loser
! Score
|- align=left
| [[2009 US Open – Women's singles#Section 4|Women's singles – 1st round]]
| {{Flagicon|RUS}} '''[[Svetlana Kuznetsova]] [6]'''
| {{Flagicon|GER}} [[Julia Görges]]
| 6–3, 6–2
|- align=left
| [[2009 US Open – Women's singles#Section 1|Women's singles – 1st round]]
| {{Flagicon|RUS}} '''[[Dinara Safina]] [1]'''
| {{Flagicon|AUS}} [[Olivia Rogowska]] [WC]
| 6–7<sup>(5–7)</sup>, 6–2, 6–4
|- align=left
| [[2009 US Open – Men's singles#Section 3|Men's singles – 1st round]]
| {{Flagicon|SRB|2004}} '''[[Novak Djokovic]] [4]'''
| {{Flagicon|CRO}} [[Ivan Ljubičić]]
| 6–3, 6–1, 6–3
|-  style="text-align:left; background:lavender;"
| [[2009 US Open – Women's singles#Section 3|Women's singles – 1st round]]
| {{Flagicon|RUS}} '''[[Maria Sharapova]] [29]'''
| {{Flagicon|BUL}} [[Tsvetana Pironkova]]
| 6–3, 6–0
|-  style="text-align:left; background:lavender;"
| [[2009 US Open – Men's singles#Section 8|Men's singles – 1st round]]
| {{Flagicon|GBR}} '''[[Andy Murray]] [2]'''
| {{Flagicon|LAT}} [[Ernests Gulbis]]
| 7–5, 6–3, 7–5
|-
! colspan=4|'''Matches on [[Louis Armstrong Stadium]]'''
|-
! Event
! Winner
! Loser
! Score
|- align=left
| [[2009 US Open – Women's singles#Section 4|Women's singles – 1st round]]
| {{Flagicon|DEN}} '''[[Caroline Wozniacki]] [9]'''
| {{Flagicon|KAZ}} [[Galina Voskoboeva]]
| 6–4, 6–0
|- align=left
| [[2009 US Open – Men's singles#Section 5|Men's singles – 1st round]]
| {{Flagicon|CZE}} '''[[Tomáš Berdych]] [17]'''
| {{Flagicon|USA}} [[Wayne Odesnik]]
| 7–5, 6–4, 6–4
|- align=left
| [[2009 US Open – Women's singles#Section 2|Women's singles – 1st round]]
| {{Flagicon|SRB|2004}} '''[[Jelena Janković]] [5]'''
| {{Flagicon|ITA}} [[Roberta Vinci]]
| 6–2, 6–3
|- align=left
| [[2009 US Open – Men's singles#Section 2|Men's singles – 1st round]]
| {{Flagicon|USA}} '''[[Sam Querrey]] [22]'''
| {{Flagicon|USA}} [[Michael Yani]] [Q]
| 6–3, 7–5, 6–4
|- align=left
| [[2009 US Open – Women's singles#Section 2|Women's singles – 1st round]]
| {{Flagicon|UKR}} '''[[Kateryna Bondarenko]]'''
| {{Flagicon|SRB|2004}} [[Ana Ivanovic]] [11]
| 2–6, 6–3, 7–6<sup>(9–7)</sup>
|-
! colspan=4|'''Matches on the Grandstand'''
|-
! Event
! Winner
! Loser
! Score
|- align=left
| [[2009 US Open – Men's singles#Section 5|Men's singles – 1st round]]
| {{Flagicon|FRA}} '''[[Jo-Wilfried Tsonga]] [7]'''
| {{Flagicon|USA}} [[Chase Buchanan]] [WC]
| 6–0, 6–2, 6–1
|- align=left
| [[2009 US Open – Women's singles#Section 3|Women's singles – 1st round]]
| {{Flagicon|USA}}  '''[[Melanie Oudin]]'''
| {{Flagicon|RUS}} [[Anastasia Pavlyuchenkova]]
| 6–1, 6–2
|- align=left
| [[2009 US Open – Men's singles#Section 8|Men's singles – 1st round]]
| {{Flagicon|CRO}} '''[[Marin Čilić]] [16]'''
| {{Flagicon|USA}} [[Ryan Sweeting]]
| 7–6<sup>(7–2)</sup>, 6–4, 7–6<sup>(7–4)</sup>
|- align=left
| [[2009 US Open – Women's singles#Section 3|Women's singles – 1st round]]
| {{Flagicon|RUS}} '''[[Elena Dementieva]] [4]'''
| {{Flagicon|FRA}} [[Camille Pin]] [Q]
| 6–1, 6–2
|-
! colspan=4|''Colored background indicates a night match''
|}
</div>

=== Day 3 (September 2) ===
The men's side saw [[Rafael Nadal]] playing his first match at the 2009 US Open and winning against his friend [[Richard Gasquet]]. He was joined by no. 1 seed [[Roger Federer]], [[Juan Martín del Potro]], [[Gaël Monfils]], [[Lleyton Hewitt]], [[Juan Carlos Ferrero]], and [[Gilles Simon]], who all won in straight sets, while [[David Ferrer]], [[Nicolás Almagro]] and American [[Robby Ginepri]] won in 4. Joining them was Austrian [[Jürgen Melzer]], who defeated [[Marat Safin]] in Safin's last Grand Slam match.<ref>{{Cite news|author=espn.com|title=Safin bids farewell| url= https://www.espn.com/sports/tennis/usopen09/news/story?id=4440324}}</ref>

On the women's side, upsets continued with [[Amélie Mauresmo]] falling to [[Aleksandra Wozniak]], [[Anabel Medina Garrigues]] losing to [[Kirsten Flipkens]], and dark horse favorite Australian [[Samantha Stosur]] losing to American [[Vania King]],<ref>{{Cite news|author=taragana.com|title=American Vania King upsets No. 15 seed Samantha Stosur in second round of US Open| url =http://sports.gaeatimes.com/2009/09/02/american-vania-king-upsets-no-15-seed-samantha-stosur-in-second-round-of-us-open-25101/}}</ref> all in straight sets, while [[Marion Bartoli]] and [[Agnieszka Radwańska]] both fell to resurging players [[Kim Clijsters]] and [[Maria Kirilenko]] in three. However, the day also saw half of the seeds getting through easily and was led by former champion [[Venus Williams]] and [[Flavia Pennetta]], who won in [[double bagel]], [[Victoria Azarenka]], [[Francesca Schiavone]], [[Elena Vesnina]], and [[Li Na]]. The day ended for the first time in over 30 years in the US Open history by a women's match, which saw [[Serena Williams]] dispatching [[Melinda Czink]] in just 53 minutes.<ref>{{Cite news|author=nytimes.com|title=Federer and Serena Williams Cruise at Night| url =https://www.nytimes.com/2009/09/03/sports/tennis/03night.html | work=The New York Times | date=September 3, 2009 | access-date=April 23, 2010}}</ref>

On the doubles side, there were a couple of major upsets: sixth seeded [[Mariusz Fyrstenberg]] and [[Marcin Matkowski]], fell in their opening round, as well as unseeded world no. 8 in doubles [[Lisa Raymond]] and her partner [[Shenay Perry]].

* Seeds out:
** [[2009 US Open – Women's singles|Women's singles]]: {{Flagicon|POL}} [[Agnieszka Radwańska]] [12], {{Flagicon|FRA}} [[Marion Bartoli]] [14], {{Flagicon|AUS}} [[Samantha Stosur]] [15], {{Flagicon|FRA}} [[Amélie Mauresmo]] [17], {{Flagicon|ESP}} [[Anabel Medina Garrigues]] [20]
** [[2009 US Open – Men's doubles|Men's doubles]]: {{Flagicon|POL}} [[Mariusz Fyrstenberg]] / {{Flagicon|POL}} [[Marcin Matkowski]] [6], {{Flagicon|AUS}} [[Ashley Fisher]] / {{Flagicon|AUS}} [[Jordan Kerr]] [14]
** [[2009 US Open – Women's doubles|Women's doubles]]: {{Flagicon|USA}} [[Raquel Atawo|Raquel Kops-Jones]] / {{Flagicon|USA}} [[Abigail Spears]] [15]
* [https://web.archive.org/web/20090904093557/http://www.usopen.org/en_US/scores/schedule/schedule9.html Schedule of play]

<div style="text-align: center;">
{| class="wikitable collapsible uncollapsed"
! colspan=4|{{Nowrap|'''Matches on main courts'''<ref>{{cite web|url=http://www.usopen.org/en_US/scores/schedule/schedule9.html|title=Day 3 Schedule|access-date=September 12, 2009|publisher=USOpen}}</ref>}}
|-
! colspan=4|'''Matches on [[Arthur Ashe Stadium]]'''
|-
! Event
! Winner
! Loser
! Score
|- align=left
| [[2009 US Open – Women's singles#Section 7|Women's singles – 2nd round]]
| {{Flagicon|CAN}} '''[[Aleksandra Wozniak]]'''
| {{Flagicon|FRA}} [[Amélie Mauresmo]] [17]
| 6–4, 6–0
|- align=left
| [[2009 US Open – Women's singles#Section 6|Women's singles – 2nd round]]
| {{Flagicon|USA}} '''[[Venus Williams]] [3]'''
| {{Flagicon|USA}} [[Bethanie Mattek-Sands]]
| 6–4, 6–2
|- align=left
| [[2009 US Open – Men's singles#Section 6|Men's singles – 1st round]]
| {{Flagicon|ESP}} '''[[Rafael Nadal]] [3]'''
| {{Flagicon|FRA}} [[Richard Gasquet]]
| 6–2, 6–2, 6–3
|-  style="text-align:left; background:lavender;"
| [[2009 US Open – Men's singles#Section 1|Men's singles – 2nd round]]
| {{Flagicon|SUI}} '''[[Roger Federer]] [1]'''
| {{Flagicon|GER}} [[Simon Greul]]
| 6–3, 7–5, 7–5
|-  style="text-align:left; background:lavender;"
| [[2009 US Open – Women's singles#Section 8|Women's singles – 2nd round]]
| {{Flagicon|USA}} '''[[Serena Williams]] [2]'''
| {{Flagicon|HUN}} [[Melinda Czink]]
| 6–1, 6–1
|-
! colspan=4|'''Matches on [[Louis Armstrong Stadium]]'''
|-
! Event
! Winner
! Loser
! Score
|- align=left
| [[2009 US Open – Women's singles#Section 7|Women's singles – 2nd round]]
| {{Flagicon|ITA}} '''[[Flavia Pennetta]] [10]'''
| {{Flagicon|IND}} [[Sania Mirza]]
| 6–0, 6–0
|- align=left
| [[2009 US Open – Men's singles#Section 7|Men's singles – 1st round]]
| {{Flagicon|AUT}} '''[[Jürgen Melzer]]'''
| {{Flagicon|RUS}} [[Marat Safin]]
| 1–6, 6–4, 6–3, 6–4
|- align=left
| [[2009 US Open – Women's singles#Section 6|Women's singles – 2nd round]]
| {{Flagicon|BEL}} '''[[Kim Clijsters]] [WC]'''
| {{Flagicon|FRA}} [[Marion Bartoli]] [14]
| 5–7, 6–1, 6–2
|- align=left
| [[2009 US Open – Men's singles#Section 7|Men's singles – 1st round]]
| {{Flagicon|ARG}} '''[[Juan Martín del Potro]] [6]'''
| {{Flagicon|ARG}} [[Juan Mónaco]]
| 6–3, 6–3, 6–1
|-
! colspan=4|'''Matches on the Grandstand'''
|-
! Event
! Winner
! Loser
! Score
|- align=left
| [[2009 US Open – Men's singles#Section 6|Men's singles – 1st round]]
| {{Flagicon|FRA}} '''[[Gaël Monfils]] [13]'''
| {{Flagicon|FRA}} [[Jérémy Chardy]]
| 6–1, 6–4, 6–3
|- align=left
| [[2009 US Open – Women's singles#Section 7|Women's singles – 2nd round]]
| {{Flagicon|RUS}}  '''[[Vera Zvonareva]] [7]'''
| {{Flagicon|RUS}} [[Anna Chakvetadze]]
| 3–6, 6–1, 6–1
|- align=left
| [[2009 US Open – Women's singles#Section 5|Women's singles – 2nd round]]
| {{Flagicon|BLR|1995}} '''[[Victoria Azarenka]] [8]'''
| {{Flagicon|CZE}} [[Barbora Strýcová|Barbora Záhlavová-Strýcová]] [Q]
| 6–2, 6–1
|- align=left
| [[2009 US Open – Women's singles#Section 8|Women's singles – 2nd round]]
| {{Flagicon|USA}} '''[[Vania King]] [WC]'''
| {{Flagicon|AUS}} [[Samantha Stosur]] [15]
| 7–5, 6–4
|- align=left
| [[2009 US Open – Men's singles#Section 1|Men's singles – 2nd round]]
| {{Flagicon|AUS}} '''[[Lleyton Hewitt]] [31]'''
| {{Flagicon|ARG}} [[Juan Ignacio Chela]] [PR]
| 6–3, 6–3, 6–4
|-
! colspan=4|''Colored background indicates a night match''
|}
</div>

=== Day 4 (September 3) ===
Day 4 continued the success of the top men's seeds, with no. 4 seed [[Novak Djokovic]] dispatching [[Carsten Ball]] 6–2, 6–4, 6–4. He was joined by [[2009 French Open]] runner-up [[Robin Söderling]], [[2009 French Open]] semifinalist [[Tommy Haas]], [[2009 International German Open|2009 Hamburg Open]] Champion [[Nikolay Davydenko]], [[Philipp Kohlschreiber]], and [[Tommy Robredo]]. The Americans once again took advantage of their home court, with four of them winning their matches: [[James Blake (tennis)|James Blake]] surviving against [[Olivier Rochus]] in four, with Blake committing 53 unforced errors, [[John Isner]], [[Jesse Witten]], and [[Sam Querrey]]. [[Andy Roddick]] once again got through easily against [[Marc Gicquel]] 6–1, 6–4, 6–4. He produced 33 winners and only 10 unforced errors in the last match of the night.

The women's side received a lot of buzz, with 17-year-old American [[Melanie Oudin]] upsetting hot favorite and US Open Series champion [[Elena Dementieva]] in the second round. [[Yaroslava Shvedova]] of Kazakhstan upset last year's runner-up [[Jelena Janković]] in three sets.<ref>{{Cite news|author=thehindu.com|title=Dementieva, Janković ousted at US Open|url=http://www.thehindu.com/sport/tennis/article14908.ece|archive-url=https://archive.today/20130204003143/http://www.thehindu.com/sport/tennis/article14908.ece|url-status=dead|archive-date=February 4, 2013|location=Chennai, India|work=The Hindu|date=September 4, 2009}}</ref> Seeded players who joined Dementieva and Janković were [[Alona Bondarenko]], who lost to [[Gisela Dulko]], and [[Patty Schnyder]], who lost in straight sets, while [[Sabine Lisicki]] lost in three to the last Australian and qualifier on the draw [[Anastasia Rodionova]]. No. 1 seed [[Dinara Safina]] once again survived a scare from [[Kristina Barrois]], winning 6(5)–7, 6–2, 6–3. However, a few seeded players got through quite easily, led by Russians [[Svetlana Kuznetsova]], [[Maria Sharapova]], [[Nadia Petrova]], and Danish player [[Caroline Wozniacki]]. Unseeded players who got through in straight sets were [[Kateryna Bondarenko]], who eliminated Ivanovic, [[Shahar Pe'er]], [[Sara Errani]], and [[Petra Kvitová]].

On the doubles side, it was the opposite, with all of the women's doubles seeds getting through. However, on the men's side, the highest seeded players who fell were no. 9 seeded [[Łukasz Kubot]] and [[Oliver Marach]], losing to veteran doubles players [[Leoš Friedl]] and [[Jaroslav Levinský]].

* Seeds out:
** [[2009 US Open – Women's singles|Women's singles]]: {{Flagicon|RUS}} [[Elena Dementieva]] [4], {{Flagicon|SRB|2004}} [[Jelena Janković]] [5], {{Flagicon|SUI}} [[Patty Schnyder]] [19], {{Flagicon|GER}} [[Sabine Lisicki]] [23], {{Flagicon|UKR}} [[Alona Bondarenko]] [30]
** [[2009 US Open – Men's doubles|Men's doubles]]: {{Flagicon|POL}} [[Łukasz Kubot]] / {{Flagicon|AUT}} [[Oliver Marach]] [9], {{Flagicon|SWE}} [[Simon Aspelin]] / {{Flagicon|AUS}} [[Paul Hanley (tennis)|Paul Hanley]] [12], {{Flagicon|USA}} [[Travis Parrott]] / {{Flagicon|SVK}} [[Filip Polášek]] [13]
* [https://web.archive.org/web/20090905160443/http://www.usopen.org/en_US/scores/schedule/schedule10.html Schedule of play]

<div style="text-align: center;">
{| class="wikitable collapsible uncollapsed"
! colspan=4|{{Nowrap|'''Matches on main courts'''<ref>{{cite web|url=http://www.usopen.org/en_US/scores/schedule/schedule10.html|title=Day 4 Schedule|access-date=September 12, 2009|publisher=USOpen}}</ref>}}
|-
! colspan=4|'''Matches on [[Arthur Ashe Stadium]]'''
|-
! Event
! Winner
! Loser
! Score
|- align=left
| [[2009 US Open – Women's singles#Section 3|Women's singles – 2nd round]]
| {{Flagicon|USA}} '''[[Melanie Oudin]]'''
| {{Flagicon|RUS}} [[Elena Dementieva]] [4]
| 5–7, 6–4, 6–3
|- align=left
| [[2009 US Open – Women's singles#Section 2|Women's singles – 2nd round]]
| {{Flagicon|KAZ}} '''[[Yaroslava Shvedova]]'''
| {{Flagicon|SRB|2004}} [[Jelena Janković]] [5]
| 6–3, 6–7<sup>(4–7)</sup>, 7–6<sup>(8–6)</sup>
|- align=left
| [[2009 US Open – Men's singles#Section 1|Men's singles – 2nd round]]
| {{Flagicon|USA}} '''[[James Blake (tennis)|James Blake]] [21]'''
| {{Flagicon|BEL}} [[Olivier Rochus]]
| 6–4, 3–6, 7–6<sup>(8–6)</sup>, 6–3
|-  style="text-align:left; background:lavender;"
| [[2009 US Open – Women's singles#Section 3|Women's singles – 2nd round]]
| {{Flagicon|RUS}} '''[[Maria Sharapova]] [29]'''
| {{Flagicon|USA}} [[Christina McHale]] [WC]
| 6–2, 6–1
|-  style="text-align:left; background:lavender;"
| [[2009 US Open – Men's singles#Section 4|Men's singles – 2nd round]]
| {{Flagicon|USA}} '''[[Andy Roddick]] [5]'''
| {{Flagicon|FRA}} [[Marc Gicquel]]
| 6–1, 6–4, 6–4
|-
! colspan=4|'''Matches on [[Louis Armstrong Stadium]]'''
|-
! Event
! Winner
! Loser
! Score
|- align=left
| [[2009 US Open – Women's singles#Section 1|Women's singles – 2nd round]]
| {{Flagicon|RUS}} '''[[Dinara Safina]] [1]'''
| {{Flagicon|GER}} [[Kristina Barrois]]
| 6–7<sup>(5–7)</sup>, 6–2, 6–3
|- align=left
| [[2009 US Open – Men's singles#Section 2|Men's singles – 2nd round]]
| {{Flagicon|USA}} '''[[Sam Querrey]] [22]'''
| {{Flagicon|USA}} [[Kevin Kim]]
| 7–5, 6–7<sup>(6–8)</sup>, 6–4, 6–4
|- align=left
| [[2009 US Open – Women's singles#Section 4|Women's singles – 2nd round]]
| {{Flagicon|RUS}} '''[[Svetlana Kuznetsova]] [6]'''
| {{Flagicon|LAT}} [[Anastasija Sevastova]]
| 6–4, 6–2
|- align=left
| [[2009 US Open – Men's singles#Section 3|Men's singles – 2nd round]]
| {{Flagicon|SRB|2004}} '''[[Novak Djokovic]] [4]'''
| {{Flagicon|AUS}} [[Carsten Ball]] [Q]
| 6–3, 6–4, 6–4
|-
! colspan=4|'''Matches on the Grandstand'''
|-
! Event
! Winner
! Loser
! Score
|- align=left
| [[2009 US Open – Men's singles#Section 4|Men's singles – 2nd round]]
| {{Flagicon|GER}} '''[[Tommy Haas]] [20]'''
| {{Flagicon|USA}} [[Robert Kendrick]]
| 6–4, 6–4, 7–6<sup>(7–3)</sup>
|- align=left
| [[2009 US Open – Women's singles#Section 4|Women's singles – 2nd round]]
| {{Flagicon|DEN}}  '''[[Caroline Wozniacki]] [9]'''
| {{Flagicon|CRO}} [[Petra Martić]]
| 6–1, 6–0
|- align=left
| [[2009 US Open – Women's doubles#Section 3|Women's doubles – 1st round]]
| {{Flagicon|USA}} '''[[Serena Williams]] [4]<br />{{Flagicon|USA}} [[Venus Williams]] [4]'''
| {{Flagicon|GER}} [[Julia Görges]]<br />{{Flagicon|ESP}} [[Arantxa Parra Santonja]]
| 6–2, 6–2
|- align=left
| [[2009 US Open – Men's doubles#Section 1|Men's doubles – 1st round]]
| {{Flagicon|USA}} '''[[Bob Bryan]] [1]<br />{{Flagicon|USA}} [[Mike Bryan]]  [1]'''
| {{Flagicon|ARG}} [[José Acasuso]]<br />{{Flagicon|ARG}} [[Martín Vassallo Argüello]]
| 6–3, 6–4
|- align=left
| [[2009 US Open – Men's singles#Section 4|Men's singles – 2nd round]]
| {{Flagicon|USA}} '''[[John Isner]]'''
| {{Flagicon|TUR}} [[Marsel İlhan]] [Q]
| 6–3, 6–4, 7–6<sup>(7–1)</sup>
|-
! colspan=4|''Colored background indicates a night match''
|}
</div>

=== Day 5 (September 4) ===
The fifth day of the US Open saw many seeds struggle on the men's side, with no. 30 seed [[Viktor Troicki]] losing to [[Julien Benneteau]] in four sets, and no. 18 seed [[David Ferrer]] losing to [[José Acasuso]] in five sets. This day also saw [[Rafael Nadal]]<ref>{{Cite news|author=usopen.org|title=Nadal passes test versus Kiefer|url=http://www.usopen.org/en_US/news/match_reports/2009-09-04/200909041252039121671.html|access-date=September 5, 2009|archive-url=https://web.archive.org/web/20090907071449/http://www.usopen.org/en_US/news/match_reports/2009-09-04/200909041252039121671.html|archive-date=September 7, 2009|url-status=dead|df=mdy-all}}</ref> and [[Andy Murray]] struggle with their matches, with both of them being pushed to four sets. A couple of seeds were also pushed to four: [[Tomáš Berdych]] and [[Fernando González]]. No. 24 seed [[Juan Carlos Ferrero]] and no. 16 seed [[Marin Čilić]] both survived their matches, despite losing the first two sets. Many victors were pushed to five sets: [[Nicolás Almagro]], a returning [[Taylor Dent]], and [[Denis Istomin]]. Although many seeds struggled, French seeds got through easily with [[Jo-Wilfried Tsonga]], [[Gaël Monfils]], and [[Gilles Simon]] winning their matches on straight sets. They were joined by [[Argentina|Argentine]] [[Juan Martín del Potro]], who also won in straight sets.

On the women's side, [[Victoria Azarenka]] lost to Italian [[Francesca Schiavone]] in three sets after Azarenka double-faulted on a match point.<ref>{{Cite news|author=etaiwannews.com|title=Azarenka falls to Schiavone in upset at US Open |url=http://www.etaiwannews.com/etn/news_content.php?id=1049400&lang=eng_news&cate_img=145.jpg&cate_rss=news_Sports}}</ref> The rest of the matches were all won in straight sets, led by [[Serena Williams]], who defeated [[María José Martínez Sánchez]], who had a controversial match at the [[2009 French Open]]. She was joined by [[Daniela Hantuchová]], who crushed American [[Vania King]], [[Li Na]], [[Kim Clijsters]], [[Flavia Pennetta]], and [[Venus Williams]]. [[Elena Vesnina]] lost to 7th seed [[Vera Zvonareva]].

On the women's side, seventh seeded [[Hsieh Su-wei]] and [[Peng Shuai]] were ousted by the American team of [[Alexa Glatch]] and [[Carly Gullickson]]. They were followed by no. 14 seed [[Sania Mirza]] and [[Francesca Schiavone]], who lost to [[Shahar Pe'er]] and [[Gisela Dulko]] in a tight three-setter.

* Seeds out:
** [[2009 US Open – Men's singles|Men's singles]]: {{Flagicon|ESP}} [[David Ferrer]] [18], {{Flagicon|SRB|2004}} [[Viktor Troicki]] [30]
** [[2009 US Open – Women's singles|Women's singles]]: {{Flagicon|BLR|1995}} [[Victoria Azarenka]] [8], {{Flagicon|RUS}} [[Elena Vesnina]] [31]
** [[2009 US Open – Women's doubles|Women's doubles]]: {{Flagicon|TPE}} [[Hsieh Su-wei]] / {{Flagicon|CHN}} [[Peng Shuai]] [7], {{Flagicon|IND}} [[Sania Mirza]] / {{Flagicon|ITA}} [[Francesca Schiavone]] [14]
** [[2009 US Open – Mixed doubles|Mixed doubles]]: {{Flagicon|RUS}} [[Nadia Petrova]] / {{Flagicon|BLR|1995}} [[Max Mirnyi]] [6]
* [https://web.archive.org/web/20090908114443/http://www.usopen.org/en_US/scores/schedule/schedule11.html Schedule of play]

<div style="text-align: center;">
{| class="wikitable collapsible uncollapsed"
! colspan=4|{{Nowrap|'''Matches on main courts'''<ref>{{cite web|url=http://www.usopen.org/en_US/scores/schedule/schedule11.html|title=Day 5 Schedule|access-date=September 12, 2009|publisher=USOpen}}</ref>}}
|-
! colspan=4|'''Matches on [[Arthur Ashe Stadium]]'''
|-
! Event
! Winner
! Loser
! Score
|- align=left
| [[2009 US Open – Women's singles#Section 8|Women's singles – 3rd round]]
| {{Flagicon|SVK}} '''[[Daniela Hantuchová]] [22]'''
| {{Flagicon|USA}} [[Vania King]] [WC]
| 6–2, 6–2
|- align=left
| [[2009 US Open – Women's singles#Section 8|Women's singles – 3rd round]]
| {{Flagicon|USA}} '''[[Serena Williams]] [2]'''
| {{Flagicon|ESP}} [[María José Martínez Sánchez]]
| 6–3, 7–5
|- align=left
| [[2009 US Open – Men's singles#Section 8|Men's singles – 2nd round]]
| {{Flagicon|GBR}} '''[[Andy Murray]] [2]'''
| {{Flagicon|CHI}} [[Paul Capdeville]]
| 6–2, 3–6, 6–0, 6–2
|-  style="text-align:left; background:lavender;"
| [[2009 US Open – Women's singles#Section 6|Women's singles – 3rd round]]
| {{Flagicon|USA}} '''[[Venus Williams]] [3]'''
| {{Flagicon|SVK}} [[Magdaléna Rybáriková]]
| 6–2, 7–5
|-  style="text-align:left; background:lavender;"
| [[2009 US Open – Men's singles#Section 6|Men's singles – 2nd round]]
| {{Flagicon|ESP}} '''[[Rafael Nadal]] [3]'''
| {{Flagicon|GER}} [[Nicolas Kiefer]]
| 6–0, 3–6, 6–3, 6–4
|-
! colspan=4|'''Matches on [[Louis Armstrong Stadium]]'''
|-
! Event
! Winner
! Loser
! Score
|- align=left
| [[2009 US Open – Women's singles#Section 7|Women's singles – 3rd round]]
| {{Flagicon|ITA}} '''[[Flavia Pennetta]] [10]'''
| {{Flagicon|CAN}} [[Aleksandra Wozniak]]
| 6–1, 6–1
|- align=left
| [[2009 US Open – Men's singles#Section 7|Men's singles – 2nd round]]
| {{Flagicon|ARG}} '''[[Juan Martín del Potro]] [6]'''
| {{Flagicon|AUT}} [[Jürgen Melzer]]
| 7–6<sup>(8–6)</sup>, 6–3, 6–3
|- align=left
| [[2009 US Open – Men's singles#Section 6|Men's singles – 2nd round]]
| {{Flagicon|ESP}} '''[[Nicolás Almagro]] [32]'''
| {{Flagicon|USA}} [[Robby Ginepri]]
| 6–7<sup>(7–9)</sup>, 6–2, 6–3, 4–6, 6–4
|- align=left
| [[2009 US Open – Women's singles#Section 6|Women's singles – 3rd round]]
| {{Flagicon|BEL}} '''[[Kim Clijsters]] [WC]'''
| {{Flagicon|BEL}} [[Kirsten Flipkens]]
| 6–0, 6–2
|-
! colspan=4|'''Matches on the Grandstand'''
|-
! Event
! Winner
! Loser
! Score
|- align=left
| [[2009 US Open – Men's singles#Section 5|Men's singles – 2nd round]]
| {{Flagicon|FRA}} '''[[Jo-Wilfried Tsonga]] [7]'''
| {{Flagicon|FIN}} [[Jarkko Nieminen]]
| 7–5, 6–3, 6–4
|- align=left
| [[2009 US Open – Women's singles#Section 5|Women's singles – 3rd round]]
| {{Flagicon|ITA}}  '''[[Francesca Schiavone]] [26]'''
| {{Flagicon|BLR|1995}} [[Victoria Azarenka]] [8]
| 4–6, 6–2, 6–2
|- align=left
| [[2009 US Open – Women's singles#Section 5|Women's singles – 3rd round]]
| {{Flagicon|CHN}} '''[[Li Na]] [18]'''
| {{Flagicon|RUS}} [[Maria Kirilenko]]
| 6–4, 6–2
|- align=left
| [[2009 US Open – Men's singles#Section 8|Men's singles – 2nd round]]
| {{Flagicon|USA}} '''[[Taylor Dent]]'''
| {{Flagicon|ESP}} [[Iván Navarro (tennis)|Iván Navarro]]
| 6–4, 5–7, 6–7<sup>(1–7)</sup>, 7–5, 7–6<sup>(11–9)</sup>
|-
! colspan=4|''Colored background indicates a night match''
|}
</div>

=== Day 6 (September 5) ===
Five-time defending champion [[Switzerland|Swiss]] [[Roger Federer]] took out the 2001 Champion [[Lleyton Hewitt]] in four sets after losing the first to set up a match-up with [[Spaniard]] [[Tommy Robredo]] in the fourth round, who beat American [[James Blake (tennis)|James Blake]] in three sets. [[Sweden|Swede]] [[Robin Söderling]] took out the young American [[Sam Querrey]] in four sets in order to advance to face [[Russians|Russian]] [[Nikolay Davydenko]] in the fourth round, who won his match against Swiss qualifier [[Marco Chiudinelli]] in straight sets. One-time slam champion [[Novak Djokovic]] won in a four-set match after losing the first set against American qualifier [[Jesse Witten]] in order to advance to the fourth round against Czech [[Radek Štěpánek]], who won in a match against [[Germans|German]] [[Philipp Kohlschreiber]] in four sets after losing the first. Spaniard [[Fernando Verdasco]] sent German [[Tommy Haas]] packing in a brutal five-set match, Verdasco met American [[John Isner]] in the next round because Isner eliminated the 2003 champion [[Andy Roddick]] from the tournament in another five-set battle.<ref>{{Cite news|author=telegraph.co.uk|title=Andy Roddick shocking early exit
| url= https://www.telegraph.co.uk/sport/tennis/usopen/6145729/US-Open-2009-Andy-Roddick-crashes-out-of-Flushing-Meadows-to-John-Isner.html | work=The Daily Telegraph | location=London | date=September 6, 2009 | access-date=April 23, 2010}}</ref>

American [[Melanie Oudin]] defeated three-time slam champion and [[2006 US Open – Women's singles|2006 US Open Champion]] [[Russians|Russian]] [[Maria Sharapova]] in three sets, losing the first and winning the next two to advance into the fourth round. Russian [[Nadia Petrova]] defeated Chinese [[Zheng Jie]] 6–4, 6–1 to set up a match with [[Melanie Oudin]] in the fourth round. Danish [[Caroline Wozniacki]] took out doubles partner Romanian [[Sorana Cîrstea]] in the third round in 6–3, 6–2, which allowed her to set up a match with [[Svetlana Kuznetsova]] in the fourth round, after Kuznetsova beat [[Israel]]i [[Shahar Pe'er]] 7–5, 6–1. Ukrainian [[Kateryna Bondarenko]] bested [[Australians|Australian]] qualifier [[Anastasia Rodionova]] in the third round 7-6<sup>(7–4)</sup>, 6–4, which allowed her to meet [[Argentina|Argentine]] [[Gisela Dulko]], who beat [[Kazakhstan]]'s [[Yaroslava Shvedova]] 6–3, 6–4. Czech [[Petra Kvitová]] took down top-seeded world no. 1 Russian [[Dinara Safina]]<ref>{{Cite news|author=telegraph.co.uk|title=Dinara Safina struggles ended losing to Petra Kvitová in the third round
| url= https://www.telegraph.co.uk/sport/tennis/usopen/6145707/US-Open-2009-Dinara-Safina-knocked-out-to-Czech-teenager-Petra-Kvitova.html.html | archive-url= https://archive.today/20130421113330/http://www.telegraph.co.uk/sport/tennis/usopen/6145707/US-Open-2009-Dinara-Safina-knocked-out-to-Czech-teenager-Petra-Kvitova.html.html | url-status= dead | archive-date= April 21, 2013 | work=The Daily Telegraph | location=London | date=September 6, 2009 | access-date=April 23, 2010}}</ref> in three up-and-down sets 4–6, 6–2, 7-6<sup>(7–5)</sup>. This set up a fourth-round match with Belgian [[Yanina Wickmayer]], who took down Italian [[Sara Errani]] with a score of 6–3, 6–4.

* Seeds out:
** [[2009 US Open – Men's singles|Men's singles]]: {{Flagicon|USA}} [[Andy Roddick]] [5], {{Flagicon|GER}} [[Tommy Haas]] [20], {{Flagicon|USA}} [[James Blake (tennis)|James Blake]] [21], {{Flagicon|USA}} [[Sam Querrey]] [22], {{Flagicon|GER}} [[Philipp Kohlschreiber]] [23], {{Flagicon|AUS}} [[Lleyton Hewitt]] [31]
** [[2009 US Open – Women's singles|Women's singles]]: {{Flagicon|RUS}} [[Dinara Safina]] [1], {{Flagicon|CHN}} [[Zheng Jie]] [21], {{Flagicon|ROU}} [[Sorana Cîrstea]] [24], {{Flagicon|RUS}} [[Maria Sharapova]] [29]
** [[2009 US Open – Men's doubles|Men's doubles]]: {{Flagicon|BRA}} [[Bruno Soares]] / {{Flagicon|ZIM}} [[Kevin Ullyett]] [8], {{Flagicon|CZE}} [[František Čermák]] / {{Flagicon|SVK}} [[Michal Mertiňák]] [10], {{Flagicon|BRA}} [[Marcelo Melo]] / {{Flagicon|BRA}} [[André Sá]] [16]
* [https://web.archive.org/web/20090908105725/http://www.usopen.org/en_US/scores/schedule/schedule12.html Schedule of play]

<div style="text-align: center;">
{| class="wikitable collapsible uncollapsed"
! colspan=4|{{Nowrap|'''Matches on main courts'''<ref>{{cite web|url=http://www.usopen.org/en_US/scores/schedule/schedule12.html|title=Day 6 Schedule|access-date=September 12, 2009|publisher=USOpen}}</ref>}}
|-
! colspan=4|'''Matches on [[Arthur Ashe Stadium]]'''
|-
! Event
! Winner
! Loser
! Score
|- align=left
| | [[2009 US Open – Men's singles#Section 1|Men's singles – 3rd round]]
| {{Flagicon|SUI}} '''[[Roger Federer]] [1]'''
| {{Flagicon|AUS}} [[Lleyton Hewitt]] [31]
| 4–6, 6–3, 7–5, 6–4
|- align=left
| [[2009 US Open – Women's singles#Section 3|Women's singles – 3rd round]]
| {{Flagicon|USA}} '''[[Melanie Oudin]]'''
| {{Flagicon|RUS}} [[Maria Sharapova]] [29]
| 3–6, 6–4, 7–5
|- align=left
| [[2009 US Open – Men's singles#Section 4|Men's singles – 3rd round]]
| {{Flagicon|USA}} '''[[John Isner]]'''
| {{Flagicon|USA}} [[Andy Roddick]] [5]
| 7–6<sup>(7–3)</sup>, 6–3, 3–6, 5–7, 7–6<sup>(7–5)</sup>
|-  style="text-align:left; background:lavender;"
| [[2009 US Open – Men's singles#Section 1|Men's singles – 3rd round]]
| {{Flagicon|ESP}} '''[[Tommy Robredo]] [14]'''
| {{Flagicon|USA}} [[James Blake (tennis)|James Blake]] [21]
| 7–6<sup>(7–2)</sup>, 6–4, 6–4
|-
! colspan=4|'''Matches on [[Louis Armstrong Stadium]]'''
|-
! Event
! Winner
! Loser
! Score
|- align=left
| | [[2009 US Open – Men's singles#Section 3|Men's singles – 3rd round]]
| {{Flagicon|SRB|2004}} '''[[Novak Djokovic]] [4]'''
| {{Flagicon|USA}} [[Jesse Witten]] [Q]
| 6–7<sup>(2–7)</sup>, 6–3, 7–6<sup>(7–2)</sup>, 6–4
|- align=left
| | [[2009 US Open – Men's singles#Section 4|Men's singles – 3rd round]]
| {{Flagicon|ESP}} '''[[Fernando Verdasco]] [10]'''
| {{Flagicon|GER}} [[Tommy Haas]] [20]
| 3–6, 7–5, 7–6<sup>(10–8)</sup>, 1–6, 6–4
|- align=left
| [[2009 US Open – Women's doubles#Section 3|Women's doubles – 2nd round]]
| {{Flagicon|USA}} '''[[Serena Williams]] [4]<br />{{Flagicon|USA}} [[Venus Williams]] [4]'''
| {{Flagicon|TPE}} [[Latisha Chan|Chan Yung-jan]]<br />{{Flagicon|SLO}} [[Katarina Srebotnik]]
| 7–5, 6–1
|-  style="text-align:left; background:lavender;"
| [[2009 US Open – Women's singles#Section 1|Women's singles – 3rd round]]
| {{Flagicon|CZE}} '''[[Petra Kvitová]]'''
| {{Flagicon|RUS}} [[Dinara Safina]] [1]
| 6–4, 2–6, 7–6<sup>(7–5)</sup>
|-
! colspan=4|'''Matches on the Grandstand'''
|-
! Event
! Winner
! Loser
! Score
|- align=left
| [[2009 US Open – Men's singles#Section 3|Men's singles – 3rd round]]
| {{Flagicon|CZE}} '''[[Radek Štěpánek]] [15]'''
| {{Flagicon|GER}} [[Philipp Kohlschreiber]] [23]
| 4–6, 6–2, 6–3, 6–3
|- align=left
| [[2009 US Open – Women's singles#Section 3|Women's singles – 3rd round]]
| {{Flagicon|RUS}}  '''[[Nadia Petrova]] [13]'''
| {{Flagicon|CHN}} [[Zheng Jie]] [21]
| 6–4, 6–1
|- align=left
| [[2009 US Open – Men's singles#Section 2|Men's singles – 3rd round]]
| {{Flagicon|SWE}} '''[[Robin Söderling]] [12]'''
| {{Flagicon|USA}} [[Sam Querrey]] [22]
| 6–2, 7–5, 6–7<sup>(6–8)</sup>, 6–1
|- align=left
| [[2009 US Open – Women's singles#Section 4|Women's singles – 3rd round]]
| {{Flagicon|RUS}} '''[[Svetlana Kuznetsova]] [6]'''
| {{Flagicon|ISR}} [[Shahar Pe'er]]
| 7–5, 6–1
|- align=left
| [[2009 US Open – Women's singles#Section 4|Women's singles – 3rd round]]
| {{Flagicon|DEN}} '''[[Caroline Wozniacki]] [9]'''
| {{Flagicon|ROU}} [[Sorana Cîrstea]] [24]
| 6–3, 6–2
|-
! colspan=4|''Colored background indicates a night match''
|}
</div>

=== Day 7 (September 6) ===
[[File:Fernando Gonzalez - 2009 US Open.jpg|thumb|[[Fernando González]] returning to [[Tomáš Berdych]]|150px|left]] [[Spaniard]]s [[Rafael Nadal]] and [[Nicolás Almagro]] played in a third-round match which was won in straight sets by Rafael Nadal, who would face [[Frenchman]] [[Gaël Monfils]] in the fourth round. Monfils beat [[Argentina|Argentine]] [[José Acasuso]] in straight sets. [[Chile]]an [[Fernando González]] won in straight sets against Czech [[Tomáš Berdych]] and would face [[Frenchman]] [[Jo-Wilfried Tsonga]], who beat fellow Frenchman [[Julien Benneteau]] in straight sets. Spaniard [[Juan Carlos Ferrero]] won over higher-seeded Frenchman [[Gilles Simon]]. Ferrero advanced to play Argentine [[Juan Martín del Potro]], who won in four sets over Austrian [[Daniel Köllerer]]. Croatian [[Marin Čilić]] won in three easy sets over [[Denis Istomin]] of [[Uzbekistan]] to face [[British people|Briton]] [[Andy Murray]], who beat American [[Taylor Dent]] in three sets.

[[File:Elena Vesnina 2 - 2009 US Open.jpg|thumb|[[Elena Vesnina]] in a doubles match with [[Maria Kirilenko]]|150px]]American [[Serena Williams]] beat Slovakian [[Daniela Hantuchová]] in two sets that totaled 64 minutes of action to face in the quarterfinals Italian [[Flavia Pennetta]], who beat [[Russians|Russian]] [[Vera Zvonareva]]. Zvonareva had six match points in the second set, but had a meltdown and lost the third set 6–0.<ref>{{cite web|url=http://www.usopen.org/en_US/scores/stats/day13/2408ms.html |title= Match Statistics: Arthur Ashe Stadium – Women's singles – 4th Rnd. |access-date=September 7, 2009 |url-status=dead |archive-url=https://web.archive.org/web/20080912162521/http://www.usopen.org/en_US/scores/stats/day13/2408ms.html |archive-date=September 12, 2008 }}</ref> Chinese [[Li Na]] won in two sets over Italian [[Francesca Schiavone]]. Na advanced to play wild-card Belgian [[Kim Clijsters]], who took down third-seeded [[Venus Williams]] in three sets after two love games, 6-0 for Clijsters and 0-6 for Venus Williams. The third set went to Clijsters in one break of Venus's serve 6–4.

* Seeds out:
** [[2009 US Open – Men's singles|Men's singles]]: {{Flagicon|FRA}} [[Gilles Simon]] [9], {{Flagicon|CZE}} [[Tomáš Berdych]] [17], {{Flagicon|ESP}} [[Nicolás Almagro]] [32]
** [[2009 US Open – Women's singles|Women's singles]]: {{Flagicon|USA}} [[Venus Williams]] [3], {{Flagicon|RUS}} [[Vera Zvonareva]] [7], {{Flagicon|SVK}} [[Daniela Hantuchová]] [22], {{Flagicon|ITA}} [[Francesca Schiavone]] [26]
** [[2009 US Open – Men's doubles|Men's doubles]]: {{Flagicon|CZE}} [[Martin Damm]] / {{Flagicon|SWE}} [[Robert Lindstedt]] [11]
** [[2009 US Open – Women's doubles|Women's doubles]]: {{Flagicon|ESP}} [[Anabel Medina Garrigues]] / {{Flagicon|ESP}} [[Virginia Ruano Pascual]] [2], {{Flagicon|GER}} [[Anna-Lena Grönefeld]] / {{Flagicon|SUI}} [[Patty Schnyder]] [9]
* [https://web.archive.org/web/20090907190230/http://www.usopen.org/en_US/scores/schedule/schedule13.html Schedule of play]

<div style="text-align: center;">
{| class="wikitable collapsible uncollapsed"
! colspan=4|{{Nowrap|'''Matches on main courts'''<ref>{{cite web|url=http://www.usopen.org/en_US/scores/schedule/schedule13.html|title=Day 7 Schedule|access-date=September 12, 2009|publisher=USOpen}}</ref>}}
|-
! colspan=4|'''Matches on [[Arthur Ashe Stadium]]'''
|-
! Event
! Winner
! Loser
! Score
|- align=left
| [[2009 US Open – Women's singles#Section 8|Women's singles – 4th round]]
| {{Flagicon|USA}} '''[[Serena Williams]] [2]'''
| {{Flagicon|SVK}} [[Daniela Hantuchová]] [22]
| 6–2, 6–0
|- align=left
| [[2009 US Open – Men's singles#Section 6|Men's singles – 3rd round]]
| {{Flagicon|ESP}} '''[[Rafael Nadal]] [3]'''
| {{Flagicon|ESP}} [[Nicolás Almagro]] [32]
| 7–5, 6–4, 6–4
|- align=left
| [[2009 US Open – Women's singles#Section 6|Women's singles – 4th round]]
| {{Flagicon|BEL}} '''[[Kim Clijsters]] [WC]'''
| {{Flagicon|USA}} [[Venus Williams]] [3]
| 6–0, 0–6, 6–4
|-  style="text-align:left; background:lavender;"
| [[2009 US Open – Women's singles#Section 7|Women's singles – 4th round]]
| {{Flagicon|ITA}} '''[[Flavia Pennetta]] [10]'''
| {{Flagicon|RUS}} [[Vera Zvonareva]] [7]
| 3–6, 7–6<sup>(8–6)</sup>, 6–0
|-  style="text-align:left; background:lavender;"
| [[2009 US Open – Men's singles#Section 8|Men's singles – 3rd round]]
| {{Flagicon|GBR}} '''[[Andy Murray]] [2]'''
| {{Flagicon|USA}} [[Taylor Dent]] [WC]
| 6–3, 6–2, 6–2
|-
! colspan=4|'''Matches on [[Louis Armstrong Stadium]]'''
|-
! Event
! Winner
! Loser
! Score
|- align=left
| [[2009 US Open – Men's singles#Section 7|Men's singles – 3rd round]]
| {{Flagicon|ESP}} '''[[Juan Carlos Ferrero]] [24]'''
| {{Flagicon|FRA}} [[Gilles Simon]] [9]
| 1–6, 6–4, 7–6<sup>(7–5)</sup>, 1–0, retired
|- align=left
| [[2009 US Open – Women's singles#Section 5|Women's singles – 4th round]]
| {{Flagicon|CHN}} '''[[Li Na]] [18]'''
| {{Flagicon|ITA}} [[Francesca Schiavone]] [26]
| 6–2, 6–3
|- align=left
| [[2009 US Open – Men's singles#Section 7|Men's singles – 3rd round]]
| {{Flagicon|ARG}} '''[[Juan Martín del Potro]] [6]'''
| {{Flagicon|AUT}} [[Daniel Köllerer]]
| 6–1, 3–6, 6–3, 6–3
|- align=left
| [[2009 US Open – Women's doubles#Section 3|Women's doubles – 3rd round]]
| {{Flagicon|USA}} '''[[Serena Williams]] [4]<br />{{Flagicon|USA}} [[Venus Williams]] [4]'''
| {{Flagicon|ROU}} [[Sorana Cîrstea]]<br />{{Flagicon|DEN}} [[Caroline Wozniacki]]
| 6–4, 6–2
|-
! colspan=4|'''Matches on the Grandstand'''
|-
! Event
! Winner
! Loser
! Score
|- align=left
| [[2009 US Open – Women's doubles#Section 4|Women's doubles – 3rd round]]
| {{Flagicon|RUS}} '''[[Maria Kirilenko]] [10]<br />{{Flagicon|RUS}} [[Elena Vesnina]] [10]'''
| {{Flagicon|USA}} [[Alexa Glatch]]<br />{{Flagicon|USA}} [[Carly Gullickson]]
| 7–6<sup>(7–3)</sup>, 6–2
|- align=left
| [[2009 US Open – Men's singles#Section 5|Men's singles – 3rd round]]
| {{Flagicon|CHI}}  '''[[Fernando González]] [11]'''
| {{Flagicon|CZE}} [[Tomáš Berdych]] [17]
| 7–5, 6–4, 6–4
|- align=left
| [[2009 US Open – Men's singles#Section 5|Men's singles – 3rd round]]
| {{Flagicon|FRA}} '''[[Jo-Wilfried Tsonga]] [7]'''
| {{Flagicon|FRA}} [[Julien Benneteau]]
| 7–6<sup>(7–4)</sup>, 6–2, 6–4
|- align=left
| [[2009 US Open – Men's singles#Section 6|Men's singles – 3rd round]]
| {{Flagicon|FRA}} '''[[Gaël Monfils]] [13]'''
| {{Flagicon|ARG}} [[José Acasuso]]
| 6–3, 6–4, 1–0, retired
|-
! colspan=4|''Colored background indicates a night match''
|}
</div>

=== Day 8 (September 7) ===
[[Sweden|Swede]] [[Robin Söderling]] advanced to the quarterfinals with a retirement of [[Russians|Russian]] [[Nikolay Davydenko]] to face the Swiss [[Roger Federer]], who beat [[Spaniard]] [[Tommy Robredo]] in straight sets. This would mark the third time the duo of Federer and Söderling has met in a Grand Slam in 2009, including the [[2009 French Open]] final and the [[2009 Wimbledon Championships]] fourth round, which were both won by Federer. [[Spaniard]] [[Fernando Verdasco]] beat American [[John Isner]] to advance into the quarterfinals, which means for the first time in US Open history no American male advanced into the quarterfinals of the tournament.<ref>CBS Sport Broadcast on September 7, 2009</ref> Verdasco would face Serbian [[Novak Djokovic]] in the quarterfinals because Djokovic took down Czech [[Radek Štěpánek]] in straight sets. After defeating Štěpánek, Djokovic provided a light-hearted moment for the crowd along with former tennis great and current commentator [[John McEnroe]]. Djokovic began by impersonating McEnroe, who grew up in the nearby [[Queens]] neighborhood of [[Douglaston, Queens|Douglaston]]. He then motioned for McEnroe to come down from the press box; McEnroe obliged, mimicking some of Djokovic's mannerisms before the two played a few points. The two then embraced at the net.

The first match featured Ukrainian [[Kateryna Bondarenko]] making quick work of Argentine [[Gisela Dulko]] in double-bagel sets in 47 minutes. Dulko had beaten Bondarenko's sister, [[Alona Bondarenko]], in the second round. with Dulko making 20 unforced errors compared to Bondarenko's 6, while Bondarenko made 17 winners to Dulko's 7.<ref>{{cite web|url=http://www.usopen.org/en_US/scores/stats/day14/2402ms.html |title= Match Statistics: Armstrong – Women's singles – 4th Rnd. |access-date=September 7, 2009 |url-status=dead |archive-url=https://web.archive.org/web/20080912024753/http://www.usopen.org/en_US/scores/stats/day14/2402ms.html |archive-date=September 12, 2008 }}</ref> Melanie Oudin advanced to her first Grand Slam quarterfinal with a 1–6, 7–6, 6–3 win over No. 13 seed Nadia Petrova. Belgian [[Yanina Wickmayer]] won in a three-set match against [[Czech (people)|Czech]] [[Petra Kvitová]] to advance into the quarterfinals, making two Belgians who have advanced to the quarterfinalss for the first time since the [[2003 US Open – Women's singles|2003 US Open]] tournament. Wickmayer took advantage of the Czech's unforced errors and won the match 4–6, 6–4, 7–5. Caroline Wozniacki defeated Svetlana Kuznetsova 2–6, 7–6, 7–6 in an absorbing contest that kicked off Monday's night session on Arthur Ashe Stadium.

* Seeds out:
** [[2009 US Open – Men's singles|Men's singles]]: {{Flagicon|RUS}} [[Nikolay Davydenko]] [8], {{Flagicon|ESP}} [[Tommy Robredo]] [14], {{Flagicon|CZE}} [[Radek Štěpánek]] [15]
** [[2009 US Open – Women's singles|Women's singles]]: {{Flagicon|RUS}} [[Svetlana Kuznetsova]] [6], {{Flagicon|RUS}} [[Nadia Petrova]] [13]
** [[2009 US Open – Women's doubles|Women's singles]]: {{Flagicon|SVK}} [[Daniela Hantuchová]] / {{Flagicon|JPN}} [[Ai Sugiyama]] [5], {{Flagicon|USA}} [[Vania King]] / {{Flagicon|ROU}} [[Monica Niculescu]] [12]
** [[2009 US Open – Mixed doubles|Mixed doubles]]: {{Flagicon|USA}} [[Lisa Raymond]] / {{Flagicon|POL}} [[Marcin Matkowski]] [3], {{Flagicon|AUS}} [[Rennae Stubbs]] / {{Flagicon|SWE}} [[Robert Lindstedt]] [7], {{Flagicon|USA}} [[Bethanie Mattek-Sands]] / {{Flagicon|SRB|2004}} [[Nenad Zimonjić]] [8]
* [https://web.archive.org/web/20090908143553/http://www.usopen.org/en_US/scores/schedule/schedule14.html Schedule of play]
<div style="text-align: center;">
{| class="wikitable collapsible uncollapsed"
! colspan=4|{{Nowrap|'''Matches on main courts'''<ref>{{cite web|url=http://www.usopen.org/en_US/scores/schedule/schedule14.html|title=Day 8 Schedule|access-date=September 12, 2009|publisher=USOpen}}</ref>}}
|-
! colspan=4|'''Matches on [[Arthur Ashe Stadium]]'''
|-
! Event
! Winner
! Loser
! Score
|- align=left
| [[2009 US Open – Women's singles#Section 2|Women's singles – 4th round]]
| {{Flagicon|UKR}} '''[[Kateryna Bondarenko]]'''
| {{Flagicon|ARG}} [[Gisela Dulko]]
| 6–0, 6–0
|- align=left
| [[2009 US Open – Women's singles#Section 3|Women's singles – 4th round]]
| {{Flagicon|USA}} '''[[Melanie Oudin]]'''
| {{Flagicon|RUS}} [[Nadia Petrova]] [13]
| 1–6, 7–6<sup>(7–2)</sup>, 6–3
|- align=left
| [[2009 US Open – Men's singles#Section 1|Men's singles – 4th round]]
| {{Flagicon|SUI}} '''[[Roger Federer]] [1]'''
| {{Flagicon|ESP}} [[Tommy Robredo]] [14]
| 7–5, 6–2, 6–2
|-  style="text-align:left; background:lavender;"
| [[2009 US Open – Women's singles#Section 4|Women's singles – 4th round]]
| {{Flagicon|DEN}} '''[[Caroline Wozniacki]] [9]'''
| {{Flagicon|RUS}} [[Svetlana Kuznetsova]] [6]
| 2–6, 7–6<sup>(7–5)</sup>, 7–6<sup>(7–3)</sup>
|-  style="text-align:left; background:lavender;"
|  [[2009 US Open – Men's singles#Section 3|Men's singles – 4th round]]
| {{Flagicon|SRB|2004}} '''[[Novak Djokovic]] [4]'''
| {{Flagicon|CZE}} [[Radek Štěpánek]] [15]
| 6–1, 6–3, 6–3
|-
! colspan=4|'''Matches on [[Louis Armstrong Stadium]]'''
|-
! Event
! Winner
! Loser
! Score
|- align=left
| [[2009 US Open – Men's singles#Section 2|Men's singles – 4th round]]
| {{Flagicon|SWE}} '''[[Robin Söderling]] [12]'''
| {{Flagicon|RUS}} [[Nikolay Davydenko]] [8]
| 7–5, 3–6, 6–2, retired
|- align=left
| [[2009 US Open – Women's singles#Section 1|Women's singles – 4th round]]
| {{Flagicon|BEL}} '''[[Yanina Wickmayer]]'''
| {{Flagicon|CZE}} [[Petra Kvitová]]
| 4–6, 6–4, 7–5
|- align=left
| [[2009 US Open – Men's singles#Section 4|Men's singles – 4th round]]
| {{Flagicon|ESP}} '''[[Fernando Verdasco]] [10]'''
| {{Flagicon|USA}} [[John Isner]]
| 4–6, 6–4, 6–4, 6–4
|- align=left
| [[2009 US Open – Mixed doubles#Top half|Mixed doubles – Quarterfinals]]
| {{Flagicon|USA}} '''[[Liezel Huber]] [1]<br />{{Flagicon|IND}} [[Mahesh Bhupathi]] [1]'''
| {{Flagicon|USA}} [[Bethanie Mattek-Sands]] [8]<br />{{Flagicon|SRB|2004}} [[Nenad Zimonjić]] [8]
| 6–4, 6–3
|-
! colspan=4|'''Matches on the Grandstand'''
|-
! Event
! Winner
! Loser
! Score
|- align=left
| [[2009 US Open – Men's doubles#Section 2|Men's doubles – 3rd round]]
| {{Flagicon|CZE}} '''[[Lukáš Dlouhý]] [4]<br />{{Flagicon|IND}} [[Leander Paes]] [4]'''
| {{Flagicon|AUT}} [[Julian Knowle]]<br />{{Flagicon|AUT}} [[Jürgen Melzer]]
| 7–5, 6–4
|- align=left
| [[2009 US Open – Men's doubles#Section 4|Men's doubles – 3rd round]]
| {{Flagicon|CAN}} '''[[Daniel Nestor]] [2]<br />{{Flagicon|SRB|2004}} [[Nenad Zimonjić]] [2]'''
| {{Flagicon|USA}} [[Robert Kendrick]]<br />{{Flagicon|SRB|2004}} [[Janko Tipsarević]]
| 6–2, 5–7, 6–4
|- align=left
| [[2009 US Open – Women's doubles#Section 3|Women's doubles – 3rd round]]
| {{Flagicon|CHN}} '''[[Yan Zi (tennis)|Yan Zi]] [11]<br />{{Flagicon|CHN}} [[Zheng Jie]] [11]'''
| {{Flagicon|SVK}} [[Daniela Hantuchová]] [5]<br />{{Flagicon|JPN}} [[Ai Sugiyama]] [5]
| 4–6, 6–4, 6–4
|- align=left
| [[2009 US Open – Mixed doubles#Bottom half|Mixed doubles – Quarterfinals]]
| {{Flagicon|ZIM}} '''[[Cara Black]] [2]<br />{{Flagicon|IND}} [[Leander Paes]] [2]'''
| {{Flagicon|AUS}} [[Rennae Stubbs]] [7]<br />{{Flagicon|SWE}} [[Robert Lindstedt]] [7]
| 7–5, 3–6, [10–6]
|-
! colspan=4|''Colored background indicates a night match''
|}
</div>

=== Day 9 (September 8) ===
In the fourth round of men's singles, [[Juan Martín del Potro]] won in straight sets over 2003 finalist [[Juan Carlos Ferrero]] 6–3, 6–3, 6–3. This set up a quarterfinal clash with [[Marin Čilić]], who upset second-seeded [[Andy Murray]] in straight sets as well. In a closely contested match [[Fernando González]] prevailed over Frenchman [[Jo-Wilfried Tsonga]] in four sets. The 11th-seeded Gonzalez advanced to his second US Open quarterfinal, having reached this stage seven years ago. This set up a meeting with [[Rafael Nadal]] in the quarterfinals who outlasted the last Frenchman [[Gaël Monfils]] in four sets.

[[Belgians|Belgian]] wild-card [[Kim Clijsters]] won over [[China|Chinese]] [[Li Na]] in two sets 6–2, 6–4 to make it to the semifinals. The next match featured American [[Serena Williams]] who defeated a gritty competitor in [[Italians|Italian]] [[Flavia Pennetta]] in the quarterfinals in two hard-fought sets. This set up a meeting in the semifinals with Clijsters, who defeated Serena's sister [[Venus Williams|Venus]] in the fourth round.

* Seeds out:
** [[2009 US Open – Men's singles|Men's singles]]: {{Flagicon|GBR}} [[Andy Murray]] [2], {{Flagicon|FRA}} [[Jo-Wilfried Tsonga]] [7], {{Flagicon|FRA}} [[Gaël Monfils]] [13], {{flagicon|ESP}} [[Juan Carlos Ferrero]] [24]
** [[2009 US Open – Women's singles|Women's singles]]: {{Flagicon|ITA}} [[Flavia Pennetta]] [10], {{Flagicon|CHN}} [[Li Na]] [18]
** [[2009 US Open – Men's doubles|Men's doubles]]: {{Flagicon|CAN}} [[Daniel Nestor]] / {{Flagicon|SRB|2004}} [[Nenad Zimonjić]] [2], {{Flagicon|RSA}} [[Wesley Moodie]] / {{Flagicon|BEL}} [[Dick Norman]] [7]
** [[2009 US Open – Women's doubles|Women's doubles]]: {{Flagicon|USA}} [[Bethanie Mattek-Sands]] / {{Flagicon|RUS}} [[Nadia Petrova]] [8], {{Flagicon|RUS}} [[Maria Kirilenko]] / {{Flagicon|RUS}} [[Elena Vesnina]] [10]
** [[2009 US Open – Mixed doubles|Mixed doubles]]: {{Flagicon|USA}} [[Liezel Huber]] / {{Flagicon|IND}} [[Mahesh Bhupathi]] [1], {{Flagicon|TPE}} [[Hsieh Su-wei]] / {{Flagicon|ZIM}} [[Kevin Ullyett]] [5]
* [https://web.archive.org/web/20090910071354/http://www.usopen.org/en_US/scores/schedule/schedule15.html Schedule of play]
<div style="text-align: center;">
{| class="wikitable collapsible uncollapsed"
! colspan=4|{{Nowrap|'''Matches on main courts'''<ref>{{cite web|url=http://www.usopen.org/en_US/scores/schedule/schedule15.html|title=Day 9 Schedule|access-date=September 12, 2009|publisher=USOpen}}</ref>}}
|-
! colspan=4|'''Matches on [[Arthur Ashe Stadium]]'''
|-
! Event
! Winner
! Loser
! Score
|- align=left
| [[2009 US Open – Men's doubles#Finals|Men's doubles – Quarterfinals]]
| {{Flagicon|USA}} '''[[Bob Bryan]] [1]<br />{{Flagicon|USA}} [[Mike Bryan]] [1]'''
| {{Flagicon|AUS}} [[Carsten Ball]] [Alt]<br />{{Flagicon|AUS}} [[Chris Guccione (tennis)|Chris Guccione]] [Alt]
| 6–4, 7–6<sup>(7–2)</sup>
|- align=left
| [[2009 US Open – Women's singles#Finals|Women's singles – Quarterfinals]]
| {{Flagicon|BEL}} '''[[Kim Clijsters]] [WC]'''
| {{Flagicon|CHN}} [[Li Na]] [18]
| 6–2, 6–4
|- align=left
| [[2009 US Open – Men's singles#Section 8|Men's singles – 4th round]]
| {{Flagicon|CRO}} '''[[Marin Čilić]] [16]'''
| {{Flagicon|GBR}} [[Andy Murray]] [2]
| 7–5, 6–2, 6–2
|-  style="text-align:left; background:lavender;"
| [[2009 US Open – Women's singles#Finals|Women's singles – Quarterfinals]]
| {{Flagicon|USA}} '''[[Serena Williams]] [2]'''
| {{Flagicon|ITA}} [[Flavia Pennetta]] [10]
| 6–4, 6–3
|-  style="text-align:left; background:lavender;"
| [[2009 US Open – Men's singles#Section 6|Men's singles – 4th round]]
| {{Flagicon|ESP}} '''[[Rafael Nadal]] [3]'''
| {{Flagicon|FRA}} [[Gaël Monfils]] [13]
| 6–7<sup>(3–7)</sup>, 6–3, 6–1, 6–3
|-
! colspan=4|'''Matches on [[Louis Armstrong Stadium]]'''
|-
! Event
! Winner
! Loser
! Score
|- align=left
| [[2009 US Open – Men's doubles#Finals|Men's doubles – Quarterfinals]]
| {{Flagicon|CZE}} '''[[Lukáš Dlouhý]] [4]<br />{{Flagicon|IND}} [[Leander Paes]] [4]'''
| {{Flagicon|RSA}} [[Wesley Moodie]][7]<br />{{Flagicon|BEL}} [[Dick Norman]] [7]
| 6–3, 5–7, 6–4
|- align=left
| [[2009 US Open – Men's singles#Section 7|Men's singles – 4th round]]
| {{Flagicon|ARG}} '''[[Juan Martín del Potro]] [6]'''
| {{Flagicon|ESP}} [[Juan Carlos Ferrero]] [24]
| 6–3, 6–3, 6–3
|- align=left
| [[2009 US Open – Women's doubles#Finals|Women's doubles – Quarterfinals]]
| {{Flagicon|AUS}} '''[[Samantha Stosur]] [3]<br />{{Flagicon|AUS}} [[Rennae Stubbs]] [3]'''
| {{Flagicon|USA}} [[Bethanie Mattek-Sands]] [8]<br />{{Flagicon|RUS}} [[Nadia Petrova]] [8]
| 6–2, 6–3
|- align=left
| [[2009 US Open – Men's singles#Section 5|Men's singles – 4th round]]
| {{Flagicon|CHI}} '''[[Fernando González]] [11]'''
| {{Flagicon|FRA}} [[Jo-Wilfried Tsonga]] [7]
| 3–6, 6–3, 7–6<sup>(7–3)</sup>, 6–4
|-
! colspan=4|'''Matches on the Grandstand'''
|-
! Event
! Winner
! Loser
! Score
|- align=left
| [[2009 US Open – Women's doubles#Finals|Women's doubles – Quarterfinals]]
| {{Flagicon|RUS}} '''[[Alisa Kleybanova]] [13]<br />{{Flagicon|RUS}} [[Ekaterina Makarova]] [13]'''
| {{Flagicon|RUS}} [[Maria Kirilenko]] [10]<br />{{Flagicon|RUS}} [[Elena Vesnina]] [10]
| 6–3, 2–6, 6–4
|- align=left
| [[2009 US Open – Men's doubles#Finals|Men's doubles – Quarterfinals]]
| {{Flagicon|IND}} '''[[Mahesh Bhupathi]] [3]<br />{{Flagicon|BAH}} [[Mark Knowles]] [3]'''
| {{Flagicon|CRO}} [[Ivan Ljubičić]]<br />{{Flagicon|FRA}} [[Michaël Llodra]]
| 6–4, 4–6, 7–6<sup>(7–4)</sup>
|- align=left
| [[2009 US Open – Mixed doubles#Finals|Mixed doubles – Semifinals]]
| {{Flagicon|ZIM}} '''[[Cara Black]] [2]<br />{{Flagicon|IND}} [[Leander Paes]] [2]'''
| {{Flagicon|TPE}} [[Hsieh Su-wei]] [5]<br />{{Flagicon|ZIM}} [[Kevin Ullyett]] [5]
| 6–2, 3–6, [10–5]
|- align=left
| [[2009 US Open – Men's doubles#Finals|Men's doubles – Semifinals]]
| {{Flagicon|BLR|1995}} '''[[Max Mirnyi]] [5]<br />{{Flagicon|ISR}} [[Andy Ram]] [5]'''
| {{Flagicon|CAN}} [[Daniel Nestor]] [2]<br />{{Flagicon|SRB|2004}} [[Nenad Zimonjić]] [2]
| 6–7<sup>(4–7)</sup>, 6–4, 6–0
|-
! colspan=4|''Colored background indicates a night match''
|}
</div>

=== Day 10 (September 9) ===
The first quarterfinals match in the Men's side featured no. 4 seed [[Novak Djokovic]] taking on no. 10 seed [[Fernando Verdasco]], with Novak Djokovic prevailing over Fernando Verdasco 7–6, 1–6, 7–5, 6–2 to reach his third straight semi-finals in the [[US Open (tennis)|US Open]]. The next match saw [[Robin Söderling]] against [[Roger Federer]]. Federer defeated Söderling in four sets: 6–0, 6–3, 6–7, 7–6.

The third quarterfinals match and the first of the day for the Women's side featured Belgian [[Yanina Wickmayer]] beating [[Kateryna Bondarenko]] of Ukraine in two sets, joining Belgian Kim Clijsters in the semi-finals. This set up a semifinal match with [[Caroline Wozniacki]] from Denmark, who defeated American [[Melanie Oudin]] in two sets 6–2, 6–2.

* Seeds out:
** [[2009 US Open – Men's singles|Men's singles]]: {{Flagicon|ESP}} [[Fernando Verdasco]] [10], {{Flagicon|SWE}} [[Robin Söderling]] [12]
** [[2009 US Open – Men's doubles|Men's doubles]]: {{Flagicon|USA}} [[Bob Bryan]] / {{Flagicon|USA}} [[Mike Bryan]] [1], {{Flagicon|BLR|1995}} [[Max Mirnyi]] / {{Flagicon|ISR}} [[Andy Ram]] [5]
** [[2009 US Open – Women's doubles|Women's doubles]]: {{Flagicon|ESP}} [[Nuria Llagostera Vives]] / {{Flagicon|ESP}} [[María José Martínez Sánchez]] [6], {{Flagicon|CHN}} [[Yan Zi (tennis)|Yan Zi]] / {{Flagicon|CHN}} [[Zheng Jie]] [11]
* [https://web.archive.org/web/20090912055355/http://www.usopen.org/en_US/scores/schedule/schedule16.html Schedule of play]

<div style="text-align: center;">
{| class="wikitable collapsible uncollapsed"
! colspan=4|{{Nowrap|'''Matches on main courts'''<ref>{{cite web|url=http://www.usopen.org/en_US/scores/schedule/schedule16.html|title=Day 10 Schedule|access-date=September 12, 2009|publisher=USOpen}}</ref>}}
|-
! colspan=4|'''Matches on [[Arthur Ashe Stadium]]'''
|-
! Event
! Winner
! Loser
! Score
|- align=left
| [[2009 US Open – Men's doubles#Finals|Men's doubles – Semifinals]]
| {{Flagicon|CZE}} '''[[Lukáš Dlouhý]] [4]<br />{{Flagicon|IND}} [[Leander Paes]] [4]'''
| {{Flagicon|USA}} [[Bob Bryan]] [1]<br />{{Flagicon|USA}} [[Mike Bryan]] [1]
| 6–4, 3–6, 7–6<sup>(8–6)</sup>
|- align=left
| [[2009 US Open – Women's singles#Finals|Women's singles – Quarterfinals]]
| {{Flagicon|BEL}} '''[[Yanina Wickmayer]]'''
| {{Flagicon|UKR}} [[Kateryna Bondarenko]]
| 7–5, 6–4
|- align=left
| [[2009 US Open – Men's singles#Finals|Men's singles – Quarterfinals]]
| {{Flagicon|SRB|2004}} '''[[Novak Djokovic]] [4]'''
| {{Flagicon|ESP}} [[Fernando Verdasco]] [10]
| 7–6<sup>(7–2)</sup>, 1–6, 7–5, 6–2
|-  style="text-align:left; background:lavender;"
| [[2009 US Open – Women's singles#Finals|Women's singles – Quarterfinals]]
| {{Flagicon|DEN}} '''[[Caroline Wozniacki]] [9]'''
| {{Flagicon|USA}} [[Melanie Oudin]]
| 6–2, 6–2
|-  style="text-align:left; background:lavender;"
| [[2009 US Open – Men's singles#Finals|Men's singles – Quarterfinals]]
| {{Flagicon|SUI}} '''[[Roger Federer]] [1]'''
| {{Flagicon|SWE}} [[Robin Söderling]] [12]
| 6–0, 6–3, 6–7<sup>(6–8)</sup>, 7–6<sup>(8–6)</sup>
|-
! colspan=4|'''Matches on [[Louis Armstrong Stadium]]'''
|-
! Event
! Winner
! Loser
! Score
|- align=left
| [[2009 US Open – Boys' singles#Section 3|Junior boys' singles 2nd round]]
| {{Flagicon|AUS}} '''[[Bernard Tomic]] [3]'''
| {{Flagicon|USA}} Alexander Domijan
| 4–6, 7–5, 6–1
|- align=left
| [[2009 US Open – Women's doubles#Finals|Women's doubles – Quarterfinals]]
| {{Flagicon|ZIM}} '''[[Cara Black]] [1]<br />{{Flagicon|USA}} [[Liezel Huber]] [1]'''
| {{Flagicon|ESP}} [[Nuria Llagostera Vives]] [6]<br />{{Flagicon|ESP}} [[María José Martínez Sánchez]] [6]
| 6–3, 2–6, 7–5
|- align=left
| [[2009 US Open – Women's doubles#Finals|Women's doubles – Quarterfinals]]
| {{Flagicon|USA}} '''[[Serena Williams]] [4]<br />{{Flagicon|USA}} [[Venus Williams]] [4]'''
| {{Flagicon|CHN}} [[Yan Zi (tennis)|Yan Zi]] [11]<br />{{Flagicon|CHN}} [[Zheng Jie]] [11]
| 7–5, 6–4
|- align=left
| [[2009 US Open – Men's doubles#Finals|Men's doubles – Semifinals]]
| {{Flagicon|IND}} '''[[Mahesh Bhupathi]] [3]<br />{{Flagicon|BAH}} [[Mark Knowles]] [3]'''
| {{Flagicon|BLR|1995}} [[Max Mirnyi]] [5]<br />{{Flagicon|ISR}} [[Andy Ram]] [5]
| 6–4, 6–2
|-
! colspan=4|''Colored background indicates a night match''
|}
</div>

=== Day 11 (September 10) ===
Argentinie Juan Martín del Potro defeated Croatian Marin Čilić in four sets and became the third of his country to qualify for the semifinals (after Vilas and Nalbandian). The other quarterfinal match between Rafael Nadal and Fernando González was suspended due to bad weather and would be resumed on Friday. Rafael Nadal was leading 7-6(4), 6-6(3–2) when play was stopped.

The Williams sisters defeated Russians Alisa Kleybanova and Ekaterina Makarova in three sets and qualified for the final. The mixed doubles final saw Americans Carly Gullickson and Travis Parrott claim the title in straight sets over Zimbabwe's Cara Black and Indian Leander Paes.

'''Seeded players out'''
* Men's Singles: {{Flagicon|CRO}} [[Marin Čilić]]
* Women's Doubles: {{Flagicon|RUS}} [[Alisa Kleybanova]] / {{Flagicon|RUS}} [[Ekaterina Makarova]]
* Mixed Doubles: {{Flagicon|ZIM}} [[Cara Black]] / {{Flagicon|IND}} [[Leander Paes]]

'''[http://www.usopen.org/en_US/scores/schedule/schedule17.html Schedule of play]'''
<div style="text-align: center;">
{| class="wikitable collapsible uncollapsed"
! colspan=4|{{Nowrap|'''Matches on main courts'''<ref>{{cite web|url=http://www.usopen.org/en_US/scores/schedule/schedule17.html|title=Day 11 Schedule|access-date=September 12, 2009|publisher=USOpen}}</ref>}}
|-
! colspan=4|'''Matches on [[Arthur Ashe Stadium]]'''
|-
! Event
! Winner
! Loser
! Score
|- align=left
| [[2009 US Open – Women's doubles#Finals|Women's doubles – Semifinals]]
| {{Flagicon|USA}} '''[[Serena Williams]] [4]<br />{{Flagicon|USA}} [[Venus Williams]] [4]'''
| {{Nowrap|{{Flagicon|RUS}} [[Alisa Kleybanova]] [13]<br />{{Flagicon|RUS}} [[Ekaterina Makarova]] [13]}}
| 7–6(4), 3–6, 6–2
|- align=left
| [[2009 US Open – Mixed doubles#Finals|Mixed doubles – Finals]]
| {{Flagicon|USA}} '''[[Carly Gullickson]] <br />{{Flagicon|USA}} [[Travis Parrott]]'''
| {{Flagicon|ZIM}} [[Cara Black]] [2]<br />{{Flagicon|IND}} [[Leander Paes]] [2]
| 6–2, 6–4
|- align=left
| [[2009 US Open – Men's singles#Finals|Men's singles – Quarterfinals]]
| {{Nowrap|{{Flagicon|ARG}} '''[[Juan Martín del Potro]] [6]'''}}
|{{Flagicon|CRO}} [[Marin Čilić]] [16]
| 4–6, 6–3, 6–2, 6–1
|-
! colspan=4|'''Matches on [[Louis Armstrong Stadium]]'''
|-
! Event
! Winner
! Loser
! Score
|- align=left
| [[2009 US Open – Boys' singles#Section 1|Junior boys' singles 3rd round]]
| {{Flagicon|IND}} '''[[Yuki Bhambri]] [1]'''
| {{Flagicon|USA}} [[Jack Sock]]
| 6–4, 6–4
|- align=left
| {{Nowrap|[[2009 US Open – Wheelchair women's singles#Finals|Wheelchair women's singles quarterfinals]]}}
| {{Flagicon|NED}} '''[[Esther Vergeer]] [1]'''
| {{Flagicon|FRA}} [[Florence Gravellier]]
| 6–2, 7–5
|- align=left
| [[2009 US Open – Girls' singles#Section 1|Junior girls' singles 3rd round]]
| {{Flagicon|USA}} '''[[Beatrice Capra]] [16]'''
| {{Flagicon|USA}} [[Asia Muhammad]]
| 3–6, 6–1, 6–1
|- align=left
| [[2009 US Open – Wheelchair men's singles#Finals|Wheelchair men's singles quarterfinals]]
| {{Flagicon|JPN}} '''[[Shingo Kunieda]] [1]'''
| {{Flagicon|AUT}} [[Martin Legner]]
| 6–2, 6–0
|-
! colspan=4|''Colored background indicates a night match''
|}
</div>

=== Day 12 (September 11) ===
All the matches that should have been played this day were postponed due to the continued rain.

'''[http://www.usopen.org/en_US/scores/schedule/schedule18.html Schedule of play]'''

=== Day 13 (September 12) ===
[[Rafael Nadal]] needed 34 minutes to finish off [[Fernando González]] in their rain-interrupted quarterfinal, advancing 7–6, 7–6, 6–0 at the [[Arthur Ashe Stadium]]. Nadal led 7-6 and 3–2 in a second-set tiebreak when play was called off late Thursday evening. Precipitation throughout a gloomy Friday rendered play impossible, throwing the schedule into chaos and prompting a resumption on Saturday at noon.

[[Kim Clijsters]] won an entry into the women's singles final after a dramatic ending to her semifinal against [[Serena Williams]]. After losing the first set 4–6, Williams smashed her racquet into the ground, giving her a [[Tennis glossary#C|code violation]] warning for racquet abuse from the chair umpire. In the second set, down 5–6 (15–30), Williams had a [[Tennis glossary#F|foot fault]] called on her second serve, giving Clijsters two match points at 15–40. Williams started yelling at the line umpire, who reported to the chair umpire. As a result, she was penalized for another code violation, for [[unsportsmanlike conduct]], meaning a point penalty for Williams, which meant that Clijsters was awarded the match 6–4 7–5 without playing the match point.<ref>{{cite web|url=http://www.usopen.org/en_US/news/articles/2009-09-12/200909111252667001796.html |title=Statement from Tournament Referee Brian Earley |access-date=September 13, 2009 |publisher=USOpen.org |url-status=dead |archive-url=https://web.archive.org/web/20090914233101/http://www.usopen.org/en_US/news/articles/2009-09-12/200909111252667001796.html |archive-date=September 14, 2009 }}</ref> Williams later admitted that she was "pretty sure" she did foot fault.<ref>{{cite web|url=http://www.usopen.org/en_US/news/match_reports/2009-09-13/200909131252819557531.html |title=Clijsters' comeback continues after Williams loses cool |access-date=September 13, 2009 |publisher=USOpen.org |url-status=dead |archive-url=https://web.archive.org/web/20090914221101/http://www.usopen.org/en_US/news/match_reports/2009-09-13/200909131252819557531.html |archive-date=September 14, 2009 }}</ref> After securing her thirteenth straight win at the US Open, Clijsters went on to play Danish youngster [[Caroline Wozniacki]] in the final, who beat her unseeded opponent [[Yanina Wickmayer]] 6–3 6–3.<ref>{{cite web|url=http://www.usopen.org/en_US/news/match_reports/2009-09-12/200909121252729301093.html |title=Wozniacki advances to first career Grand Slam final |access-date=September 13, 2009 |publisher=USOpen.org |url-status=dead |archive-url=https://web.archive.org/web/20090914221052/http://www.usopen.org/en_US/news/match_reports/2009-09-12/200909121252729301093.html |archive-date=September 14, 2009 }}</ref>

'''Seeded players out'''
* Men's Singles: {{Flagicon|CHI}} [[Fernando González]]
* Women's Singles: {{Flagicon|USA}} [[Serena Williams]]

'''[http://www.usopen.org/en_US/scores/schedule/schedule19.html Schedule of play]'''

<div style="text-align: center;">
{| class="wikitable collapsible uncollapsed"
! colspan=4|{{Nowrap|'''Matches on main courts'''<ref>{{cite web|url=http://www.usopen.org/en_US/scores/schedule/schedule19.html|title=Day 13 Schedule|access-date=September 12, 2009|publisher=USOpen}}</ref>}}
|-
! colspan=4|'''Matches on [[Arthur Ashe Stadium]]'''
|-
! Event
! Winner
! Loser
! Score
|- align=left
| [[2009 US Open – Men's singles#Finals|Men's singles – Quarterfinals]]
| {{Flagicon|ESP}} '''[[Rafael Nadal]] [3]'''
| {{Flagicon|CHI}} [[Fernando González]] [11]
| 7–6(4), 7–6(2), 6–0
|-  style="text-align:left; background:lavender;"
| [[2009 US Open – Women's singles#Finals|Women's singles – Semifinals]]
| {{Flagicon|BEL}} '''[[Kim Clijsters]] [WC]'''
| {{Flagicon|USA}} [[Serena Williams]] [2]
| 6–4, 7–5
|-
! colspan=4|'''Matches on [[Louis Armstrong Stadium]]'''
|-
! Event
! Winner
! Loser
! Score
|- style="text-align:left; background:lavender;"
| [[2009 US Open – Women's singles#Finals|Women's singles – Semifinals]]
| {{Flagicon|DEN}} '''[[Caroline Wozniacki]] [9]'''
| {{Flagicon|BEL}} [[Yanina Wickmayer]]
| 6–3, 6–3
|-
! colspan=4|''Colored background indicates a night match''
|}
</div>

=== Day 14 (September 13) ===
In the first match, Juan Martín del Potro defeated third-ranked Rafael Nadal easily, winning 6–2, 6–2, 6-2 and became the first finalist of the men's singles tournament. Del Potro's convincing victory, which echoed Caroline Wozniacki's takedown of crowd favorite Melanie Oudin in the quarterfinals, set the twenty-year-old Argentine up for his first Grand Slam final.

In the second semifinal of the women's doubles championship Cara Black and Liezel Huber defeated Samantha Stosur and Rennae Stubbs in three sets and they became finalist of the championship to defend which they got in 2008.

Lukáš Dlouhý and Leander Paes won the men's doubles defeating Mahesh Bhupathi and Mark Knowles also in three sets.

Del Potro's opponent in the men's championship match was decided in a contest between world number one Roger Federer and fourth-ranked Novak Djokovic, who lost to Federer in the final of the [[2007 US Open (tennis)|2007 U.S. Open]]. Federer dispatched his opponent in straight sets, winning 7-6(3), 7–5, 7–5, to round out the final two players remaining from an original draw of 128 men's professional tennis players.

In the women's final, unranked Kim Clijsters capped off an impressive return to professional tennis with a win over ninth seed Caroline Wozniacki of Denmark, winning 7–5, 6–3, for her second Grand Slam title.

'''Seeded players out'''
* Men's Singles: {{Flagicon|ESP}} [[Rafael Nadal]], {{Flagicon|SRB|2004}} [[Novak Djokovic]]
* Women's Singles: {{Flagicon|DEN}} [[Caroline Wozniacki]]
* Men's Doubles: {{Flagicon|IND}} [[Mahesh Bhupathi]] / {{Flagicon|BAH}} [[Mark Knowles]]
* Women's Doubles: {{Flagicon|AUS}} [[Samantha Stosur]] / {{Flagicon|AUS}} [[Rennae Stubbs]]

'''[http://www.usopen.org/en_US/scores/schedule/schedule20.html Schedule of play]'''

<div style="text-align: center;">
{| class="wikitable collapsible uncollapsed"
! colspan=4|{{Nowrap|'''Matches on main courts'''<ref>{{cite web|url=http://www.usopen.org/en_US/scores/schedule/schedule20.html|title=Day 14 Schedule|access-date=September 12, 2009|publisher=USOpen}}</ref>}}
|-
! colspan=4|'''Matches on [[Arthur Ashe Stadium]]'''
|-
! Event
! Winner
! Loser
! Score
|- align=left
| [[2009 US Open – Men's singles#Finals|Men's singles – Semifinals]]
| {{Flagicon|ARG}} '''[[Juan Martín del Potro]] [6]'''
| {{Flagicon|ESP}} [[Rafael Nadal]] [3]
| 6–2, 6–2, 6–2
|- align=left
| [[2009 US Open – Men's singles#Finals|Men's singles – Semifinals]]
| {{Flagicon|SWI}} '''[[Roger Federer]] [1]'''
| {{Flagicon|SRB|2004}} [[Novak Djokovic]] [4]
| 7–6(3), 7–5, 7–5
|-  style="text-align:left; background:lavender;"
| [[2009 US Open – Women's singles#Finals|Women's singles – Final]]
| {{Flagicon|BEL}} '''[[Kim Clijsters]] [WC]'''
| {{Flagicon|DEN}} [[Caroline Wozniacki]] [9]
| 7–5, 6–3
|-
! colspan=4|'''Matches on [[Louis Armstrong Stadium]]'''
|-
! Event
! Winner
! Loser
! Score
|- align=left
| [[2009 US Open – Women's doubles#Finals|Women's doubles – Semifinals]]
| {{Flagicon|ZIM}} '''[[Cara Black]] [1]<br />{{Flagicon|USA}} [[Liezel Huber]] [1]'''
| {{Flagicon|AUS}} [[Samantha Stosur]] [3]<br />{{Flagicon|AUS}} [[Rennae Stubbs]] [3]
| 5–7, 6–3, 6–1
|- align=left
| [[2009 US Open – Men's doubles#Finals|Men's doubles – Final]]
| {{Flagicon|CZE}} '''[[Lukáš Dlouhý]] [4]<br />{{Flagicon|IND}} [[Leander Paes]] [4]'''
| {{Flagicon|IND}} [[Mahesh Bhupathi]] [3]<br />{{Flagicon|BAH}} [[Mark Knowles]] [3]
| 3–6, 6–3, 6–2
|-
! colspan=4|''Colored background indicates a night match''
|}
</div>

=== Day 15 (September 14) ===
The Williams sisters beat Cara Black and Liezel Huber in straight sets to win the women's doubles championship, 6-2 6–2.

Juan Martín del Potro defeated Roger Federer in five sets. In so doing he became the third Argentine to win the US Open title, and the first South American to win a men's Grand Slam event on a hard court.

There was some controversy during the presentation ceremony when the Master of Ceremonies initially refused to allow del Potro the time to speak in Spanish as he was under pressure from his American television network, CBS, to get the ceremony over with so that it could return to its regularly scheduled programming.<ref>{{Cite news|url=http://straightsets.blogs.nytimes.com/2009/09/15/can-i-speak-in-spanish/|title=Can I Speak In Spanish?|date=September 15, 2009|work=The New York Times(blog)}}</ref>

'''Seeded players out'''
* Men's Singles: {{Flagicon|SUI}} [[Roger Federer]]
* Women's Doubles: {{Flagicon|ZIM}} [[Cara Black]] / {{Flagicon|USA}} [[Liezel Huber]]

'''[https://web.archive.org/web/20090205190527/http://www.usopen.org/en_US/scores/schedule/schedule21.html Schedule of play]'''

<div style="text-align: center;">
{| class="wikitable collapsible uncollapsed"
! colspan=4|{{Nowrap|'''Matches on main courts'''<ref>{{cite web|url=http://www.usopen.org/en_US/scores/schedule/schedule21.html |title=Day 15 Schedule |access-date=September 13, 2009 |publisher=USOpen |url-status=dead |archive-url=https://web.archive.org/web/20090205190527/http://www.usopen.org/en_US/scores/schedule/schedule21.html |archive-date=February 5, 2009 }}</ref>}}
|-
! colspan=4|'''Matches on [[Arthur Ashe Stadium]]'''
|-
! Event
! Winner
! Loser
! Score
|- align=left
| [[2009 US Open – Women's doubles#Finals|Women's doubles – Final]]
| {{Flagicon|USA}} '''[[Serena Williams]] [4]<br />{{Flagicon|USA}} [[Venus Williams]] [4]'''
| {{Nowrap|{{Flagicon|ZIM}} [[Cara Black]] [1]<br />{{Flagicon|USA}} [[Liezel Huber]] [1]}}
| 6–2, 6–2
|- align=left
| [[2009 US Open – Men's singles#Finals|Men's singles – Final]]
| {{Flagicon|ARG}} '''[[Juan Martín del Potro]] [6]'''
| {{Flagicon|SUI}} [[Roger Federer]] [1]
| 3–6, 7–6(5), 4–6, 7–6(4), 6–2
|}
</div>

== Seniors ==
[[File:DelpotroUSOpen2009.jpg|thumb|right|150px|[[Juan Martín del Potro]] won his first slam title of his career at the 2009 US Open.]]
[[File:Kim Clijsters crop.jpg|thumb|right|150px|[[Kim Clijsters]] won her second US Open title, which goes with her 2005 triumph, and won as a wildcard in the 2009 US Open.]]

=== Men's singles ===
{{Main|2009 US Open – Men's singles}}
{{Flagicon|ARG}} '''[[Juan Martín del Potro]]''' defeated {{Flagicon|SUI}} [[Roger Federer]], 3–6, 7–6<sup>(7–5)</sup>, 4–6, 7–6<sup>(7–4)</sup>, 6–2
* Del Potro won his 3rd title of the year, 7th overall, and 1st and only Grand Slam title.
* Del Potro became the fourth Argentine player, after [[Guillermo Vilas]], [[Gabriela Sabatini]] and [[Gastón Gaudio]], to win the Grand Slam final.

=== Women's singles ===
{{Main|2009 US Open – Women's singles}}
{{Flagicon|BEL}} '''[[Kim Clijsters]]''' defeated {{Flagicon|DEN}} [[Caroline Wozniacki]], 7–5, 6–3
* Clijsters won for the first time this year and 35th overall. It was her 2nd career Grand Slam, having previously won the [[2005 US Open (tennis)|2005 US Open]].
* Wozniacki became the first Danish female tennis player to reach the Grand Slam final, and first in the Open Era.

=== Men's doubles ===
{{Main|2009 US Open – Men's doubles}}
{{Flagicon|CZE}} '''[[Lukáš Dlouhý]]''' / {{Flagicon|IND}} '''[[Leander Paes]]''' defeated {{Flagicon|IND}} [[Mahesh Bhupathi]] / {{Flagicon|BAH}} [[Mark Knowles]], 3–6, 6–3, 6–2
* This was the pair of Dlouhý and Paes first US Open Men's Doubles title together, which this is the second slam doubles title they won this year along with the French title.

=== Women's doubles ===
{{Main|2009 US Open – Women's doubles}}
{{Flagicon|USA}} '''[[Serena Williams]]''' / {{Flagicon|USA}} '''[[Venus Williams]]''' defeated {{Flagicon|ZIM}} [[Cara Black]] / {{Flagicon|USA}} [[Liezel Huber]], 6–2, 6–2
* This was the Williams' Sisters second US Open Women's Doubles title, and was the third doubles slam title they won this year along with the Australian Open and Wimbledon.

=== Mixed doubles ===
{{Main|2009 US Open – Mixed doubles}}
{{Flagicon|USA}} '''[[Carly Gullickson]]''' / {{Flagicon|USA}} '''[[Travis Parrott]]''' defeated {{Flagicon|ZIM}} [[Cara Black]] / {{Flagicon|IND}} [[Leander Paes]], 6–2, 6–4.
* This was the first ever slam title for the pair of Gullickson and Parrott.

== Juniors ==

=== Boys' singles ===
{{Main|2009 US Open – Boys' singles}}
{{Flagicon|AUS}} '''[[Bernard Tomic]]''' defeated {{Flagicon|USA}} [[Chase Buchanan]], 6–1, 6–3.

=== Girls' singles ===
{{Main|2009 US Open – Girls' singles}}
{{Flagicon|GBR}} '''[[Heather Watson]]''' defeated {{Flagicon|RUS}} [[Yana Buchina]], 6–4, 6–1.

=== Boys' doubles ===
{{Main|2009 US Open – Boys' doubles}}
{{Flagicon|HUN}} '''[[M��rton Fucsovics]]''' / {{Flagicon|TPE}} '''[[Hsieh Cheng-peng]]''' defeated {{Flagicon|FRA}} Julien Obry / {{Flagicon|FRA}} Adrien Puget, 7–6(5), 5–7, [10–1]

=== Girls' doubles ===
{{Main|2009 US Open – Girls' doubles}}
{{Flagicon|RUS}} '''[[Valeria Solovieva]]''' / {{Flagicon|UKR}} '''[[Maryna Zanevska]]''' defeated {{Flagicon|ROU}} [[Elena Bogdan]] / {{Flagicon|THA}} [[Noppawan Lertcheewakarn]], 1–6, 6–3, [10–7]

== Wheelchair ==

=== Wheelchair men's singles ===
{{Main|2009 US Open – Wheelchair men's singles}}
{{Flagicon|JPN}} '''[[Shingo Kunieda]]''' defeated {{Flagicon|NED}} [[Maikel Scheffers]], 6–0, 6–0

=== Wheelchair women's singles ===
{{Main|2009 US Open – Wheelchair women's singles}}
{{Flagicon|NED}} '''[[Esther Vergeer]]''' defeated {{Flagicon|NED}} [[Korie Homan]], 6–0, 6–0

=== Wheelchair men's doubles ===
{{Main|2009 US Open – Wheelchair men's doubles}}
{{Flagicon|FRA}} '''[[Stéphane Houdet]] / {{Flagicon|SWE}} [[Stefan Olsson]]''' defeated {{Flagicon|NED}} [[Maikel Scheffers]] / {{Flagicon|NED}} [[Ronald Vink]], 6–4, 4–6, 6–4

=== Wheelchair women's doubles ===
{{Main|2009 US Open – Wheelchair women's doubles}}
{{Flagicon|NED}} '''[[Korie Homan]]''' / {{Flagicon|NED}} '''[[Esther Vergeer]]''' defeated {{Flagicon|AUS}} [[Daniela DiToro]] / {{Flagicon|FRA}} [[Florence Gravellier]], 6–2, 6–2

=== Wheelchair quad singles===
{{Main|2009 US Open – Wheelchair quad singles}}
{{Flagicon|GBR}} '''[[Peter Norfolk]]''' defeated {{Flagicon|USA}} [[David Wagner (tennis)|David Wagner]], 6–3, 3–6, 6–3

=== Wheelchair quad doubles===
{{Main|2009 US Open – Wheelchair quad doubles}}
{{Flagicon|USA}} '''[[Nick Taylor (tennis)|Nick Taylor]]''' / {{Flagicon|USA}} '''[[David Wagner (tennis)|David Wagner]]''' defeated {{Flagicon|SWE}} [[Johan Andersson (tennis)|Johan Andersson]] / {{Flagicon|GBR}} [[Peter Norfolk]], 6–1, 6–7(5), 6–3

== Seeds ==
<ref name=USOMen>{{cite news |author=usopen.org |title=Federer, Nadal headline 2009 US Open Men's Field |url=http://www.usopen.org/en_US/news/articles/2009-08-03/200908031249328308919.html |archive-url=https://web.archive.org/web/20090827103210/http://www.usopen.org/en_US/news/articles/2009-08-03/200908031249328308919.html |archive-date=August 27, 2009 |url-status=dead |access-date=September 6, 2009 |df=mdy-all }}</ref><ref name=USOWomen>{{cite news |author=usopen.org |title=US Serena Williams headlines 2009 US Open Women's Field |url=http://www.usopen.org/en_US/news/articles/2009-08-03/200908031249328308919.html |archive-url=https://web.archive.org/web/20090827103210/http://www.usopen.org/en_US/news/articles/2009-08-03/200908031249328308919.html |archive-date=August 27, 2009 |url-status=dead |access-date=September 6, 2009 |df=mdy-all }}</ref>
Withdrawals: [[David Nalbandian]],<ref>{{cite news|website=sportsillustrated.cnn.com |title=Nalbandian, Ancic out of U.S. Open |url=http://sportsillustrated.cnn.com/2009/tennis/07/24/usopen.withdrawals.ap/index.html }}{{dead link|date=September 2024|bot=medic}}{{cbignore|bot=medic}}</ref> [[Dominika Cibulková]],<ref>{{cite news|author=espn.com|title=Cibulkova withdraws from U.S. Open|url=https://www.espn.com/sports/tennis/usopen09/news/story?id=4421688}}</ref> [[Mardy Fish]]<ref>{{cite news|url=https://www.washingtonpost.com/wp-dyn/content/article/2009/08/30/AR2009083002985.html |title=Fish withdraws from Open |newspaper=[[The Washington Post]] |date=August 30, 2009 |access-date=August 31, 2009 |archive-url=https://web.archive.org/web/20121108180054/http://www.washingtonpost.com/wp-dyn/content/article/2009/08/30/AR2009083002985.html |archive-date=November 8, 2012 |url-status=live }}</ref>

{{Col-begin}}
{{Col-2}}

=== [[2009 US Open – Men's singles|Men's singles]] ===
# {{Flagicon|SUI}} [[Roger Federer]] ''(final, lost to [[Juan Martín del Potro]])''
# {{Flagicon|GBR}} [[Andy Murray]] ''(fourth round, lost to [[Marin Čilić]])''
# {{Flagicon|ESP}} [[Rafael Nadal]] ''(semifinals, lost to [[Juan Martín del Potro]])''
# {{Flagicon|SRB|2004}} [[Novak Djokovic]] ''(semifinals, lost to [[Roger Federer]])''
# {{Flagicon|USA}} [[Andy Roddick]] ''(third round, lost to [[John Isner]])''
# {{Flagicon|ARG}} '''[[Juan Martín del Potro]] (champion)'''
# {{Flagicon|FRA}} [[Jo-Wilfried Tsonga]] ''(fourth round, lost to [[Fernando González]])''
# {{Flagicon|RUS}} [[Nikolay Davydenko]] ''(fourth round, retired – hip injury – against [[Robin Söderling]])''
# {{Flagicon|FRA}} [[Gilles Simon]] ''(third round, retired – knee injury – against [[Juan Carlos Ferrero]])''
# {{Flagicon|ESP}} [[Fernando Verdasco]] ''(quarterfinals, lost to [[Novak Djokovic]])''
# {{Flagicon|CHI}} [[Fernando González]] ''(quarterfinals, lost to [[Rafael Nadal]])''
# {{Flagicon|SWE}} [[Robin Söderling]] ''(quarterfinals, lost to [[Roger Federer]])''
# {{Flagicon|FRA}} [[Gaël Monfils]] ''(fourth round, lost to [[Rafael Nadal]])''
# {{Flagicon|ESP}} [[Tommy Robredo]] ''(fourth round, lost to [[Roger Federer]])''
# {{Flagicon|CZE}} [[Radek Štěpánek]] ''(fourth round, lost to [[Novak Djokovic]])''
# {{Flagicon|CRO}} [[Marin Čilić]] ''(quarterfinals, lost to [[Juan Martín del Potro]])''
# {{Flagicon|CZE}} [[Tomáš Berdych]] ''(third round, lost to [[Fernando González]])''
# {{Flagicon|ESP}} [[David Ferrer]] ''(second round, lost to [[José Acasuso]])''
# {{Flagicon|SUI}} [[Stanislas Wawrinka]] ''(first round, lost to [[Nicolás Lapentti]])''
# {{Flagicon|GER}} [[Tommy Haas]] ''(third round, lost to [[Fernando Verdasco]])''
# {{Flagicon|USA}} [[James Blake (tennis)|James Blake]] ''(third round, lost to [[Tommy Robredo]])''
# {{Flagicon|USA}} [[Sam Querrey]] ''(third round, lost to [[Robin Söderling]])''
# {{Flagicon|GER}} [[Philipp Kohlschreiber]] ''(third round, lost to [[Radek Štěpánek]])''
# {{Flagicon|ESP}} [[Juan Carlos Ferrero]] ''(fourth round, lost to [[Juan Martín del Potro]])''
# {{Flagicon|USA}} [[Mardy Fish]] ''(withdrew due to rib injury)''
# {{Flagicon|FRA}} [[Paul-Henri Mathieu]] ''(first round, lost to [[Mikhail Youzhny]])''
# {{Flagicon|CRO}} [[Ivo Karlović]] ''(first round, lost to [[Iván Navarro (tennis)|Iván Navarro]])''
# {{Flagicon|ROU}} [[Victor Hănescu]] ''(first round, lost to [[John Isner]])''
# {{Flagicon|RUS}} [[Igor Andreev]] ''(first round, lost to [[Jesse Witten]])''
# {{Flagicon|SRB|2004}} [[Viktor Troicki]] ''(second round, lost to [[Julien Benneteau]])''
# {{Flagicon|AUS}} [[Lleyton Hewitt]] ''(third round, lost to [[Roger Federer]])''
# {{Flagicon|ESP}} [[Nicolás Almagro]] ''(third round, lost to [[Rafael Nadal]])''
{{Col-2}}

=== [[2009 US Open – Women's singles|Women's singles]] ===
# {{Flagicon|RUS}} [[Dinara Safina]] ''(third round, lost to [[Petra Kvitová]])''
# {{Flagicon|USA}} [[Serena Williams]] ''(semifinals, lost to [[Kim Clijsters]])''
# {{Flagicon|USA}} [[Venus Williams]] ''(fourth round, lost to [[Kim Clijsters]])''
# {{Flagicon|RUS}} [[Elena Dementieva]] ''(second round, lost to [[Melanie Oudin]])''
# {{Flagicon|SRB|2004}} [[Jelena Janković]] ''(second round, lost to [[Yaroslava Shvedova]])''
# {{Flagicon|RUS}} [[Svetlana Kuznetsova]] ''(fourth round, lost to [[Caroline Wozniacki]])''
# {{Flagicon|RUS}} [[Vera Zvonareva]] ''(fourth round, lost to [[Flavia Pennetta]])''
# {{Flagicon|BLR|1995}} [[Victoria Azarenka]] ''(third round, lost to [[Francesca Schiavone]])''
# {{Flagicon|DEN}} [[Caroline Wozniacki]] ''(final, lost to [[Kim Clijsters]])''
# {{Flagicon|ITA}} [[Flavia Pennetta]] ''(quarterfinals, lost to [[Serena Williams]])''
# {{Flagicon|SRB|2004}} [[Ana Ivanovic]] ''(first round, lost to [[Kateryna Bondarenko]])''
# {{Flagicon|POL}} [[Agnieszka Radwańska]] ''(second round, lost to [[Maria Kirilenko]])''
# {{Flagicon|RUS}} [[Nadia Petrova]] ''(fourth round, lost to [[Melanie Oudin]])''
# {{Flagicon|FRA}} [[Marion Bartoli]] ''(second round, lost to [[Kim Clijsters]])''
# {{Flagicon|AUS}} [[Samantha Stosur]] ''(second round, lost to [[Vania King]])''
# {{Flagicon|FRA}} [[Virginie Razzano]] ''(first round, lost to [[Yanina Wickmayer]])''
# {{Flagicon|FRA}} [[Amélie Mauresmo]] ''(second round, lost to [[Aleksandra Wozniak]])''
# {{Flagicon|CHN}} [[Li Na]] ''(quarterfinals, lost to [[Kim Clijsters]])''
# {{Flagicon|SUI}} [[Patty Schnyder]] ''(second round, lost to [[Sara Errani]])''
# {{Flagicon|ESP}} [[Anabel Medina Garrigues]] ''(second round, lost to [[Kirsten Flipkens]])''
# {{Flagicon|CHN}} [[Zheng Jie]] ''(third round, lost to [[Nadia Petrova]])''
# {{Flagicon|SVK}} [[Daniela Hantuchová]] ''(fourth round, lost to [[Serena Williams]])''
# {{Flagicon|GER}} [[Sabine Lisicki]] ''(second round, lost to [[Anastasia Rodionova]])''
# {{Flagicon|ROU}} [[Sorana Cîrstea]] ''(third round, lost to [[Caroline Wozniacki]])''
# {{Flagicon|EST}} [[Kaia Kanepi]] ''(first round, lost to [[Chang Kai-Chen]])''
# {{Flagicon|ITA}} [[Francesca Schiavone]] ''(fourth round, lost to [[Li Na]])''
# {{Flagicon|RUS}} [[Alisa Kleybanova]] ''(first round, lost to [[Petra Kvitová]])''
# {{Flagicon|AUT}} [[Sybille Bammer]] ''(first round, lost to [[María José Martínez Sánchez]])''
# {{Flagicon|RUS}} [[Maria Sharapova]] ''(third round, lost to [[Melanie Oudin]])''
# {{Flagicon|UKR}} [[Alona Bondarenko]] ''(second round, lost to [[Gisela Dulko]])''
# {{Flagicon|RUS}} [[Elena Vesnina]] ''(third round, lost to [[Vera Zvonareva]])''
# {{Flagicon|HUN}} [[Ágnes Szávay]] ''(first round, lost to [[Shahar Pe'er]])''
{{Col-end}}

== Wildcard entries ==
Below are the lists of the [[wildcard (tennis)|wildcard]] awardees entering in the main draw.<ref name=USOMenWildcards>{{cite news |author=usopen.org |title=2009 US Open Men's Wild Card Recipients named |url=http://www.usopen.org/en_US/news/articles/2009-08-19/200908191250713949216.html |archive-url=https://web.archive.org/web/20090822190655/http://www.usopen.org/en_US/news/articles/2009-08-19/200908191250713949216.html |archive-date=August 22, 2009 |url-status=dead |access-date=September 6, 2009 |df=mdy-all }}</ref><ref name=USOWomenWildcards>{{cite news|author=usopen.org|title=US Past champion Clijsters among US Open women's wild cards|url=http://www.usopen.org/en_US/news/articles/2009-08-20/200908201250796447687.html|access-date=August 22, 2009|archive-url=https://web.archive.org/web/20090830033041/http://www.usopen.org/en_US/news/articles/2009-08-20/200908201250796447687.html|archive-date=August 30, 2009|url-status=dead|df=mdy-all}}</ref>

{{Col-begin}}

{{Col-2}}

=== Men's singles wildcard entries ===
# {{Flagicon|USA}} [[Devin Britton]]
# {{Flagicon|USA}} [[Chase Buchanan]]
# {{Flagicon|USA}} [[Taylor Dent]]
# {{Flagicon|USA}} [[Brendan Evans]]
# {{Flagicon|AUS}} [[Chris Guccione (tennis)|Chris Guccione]]
# {{Flagicon|USA}} [[Jesse Levine]]
# {{Flagicon|FRA}} [[Michaël Llodra]]
# {{Flagicon|USA}} [[Ryan Sweeting]]

{{Col-2}}

=== Women's singles wildcard entries ===
# {{Flagicon|USA}} [[Gail Brodsky]]
# {{Flagicon|USA}} [[Mallory Cecil]]
# {{Flagicon|BEL}} '''[[Kim Clijsters]] (champion)'''
# {{Flagicon|USA}} [[Alexa Glatch]]
# {{Flagicon|USA}} [[Vania King]]
# {{Flagicon|USA}} [[Christina McHale]]
# {{Flagicon|FRA}} [[Kristina Mladenovic]]
# {{Flagicon|AUS}} [[Olivia Rogowska]]
{{Col-end}}

{{Col-begin}}
{{Col-2}}

=== Men's doubles wildcard entries ===
# {{Flagicon|USA}} [[Brendan Evans]] / {{Flagicon|USA}} [[Alex Kuznetsov]]
# {{Flagicon|USA}} [[Robby Ginepri]] / {{Flagicon|USA}} [[Scoville Jenkins]]
# {{Flagicon|USA}} [[Ryan Harrison]] / {{Flagicon|USA}} [[Kaes Van't Hof]]
# {{Flagicon|USA}} [[Jesse Levine]] / {{Flagicon|USA}} [[Ryan Sweeting]]
# {{Flagicon|USA}} [[David Martin (tennis)|David Martin]] / {{Flagicon|USA}} [[Donald Young (tennis)|Donald Young]]
# {{Flagicon|USA}} [[Daniel Nguyen]] / {{Flagicon|USA}} [[JT Sundling]]
# {{Flagicon|USA}} [[Wayne Odesnik]] / {{Flagicon|USA}} [[Michael Shabaz]]

{{Col-2}}

=== Women's doubles wildcard entries ===
# {{Flagicon|USA}} [[Kristie Ahn]] / {{Flagicon|USA}} [[Courtney Dolehide]]
# {{Flagicon|USA}} [[Lauren Albanese]] / {{Flagicon|USA}} [[Angela Haynes]]
# {{Flagicon|USA}} [[Alexa Glatch]] / {{Flagicon|USA}} [[Carly Gullickson]]
# {{Flagicon|USA}} [[Christina McHale]] / {{Flagicon|USA}} [[Asia Muhammad]]
# {{Flagicon|AUS}} [[Alicia Molik]] / {{Flagicon|USA}} [[Meghann Shaughnessy]]
# {{Flagicon|USA}} [[Ahsha Rolle]] / {{Flagicon|USA}} [[Riza Zalameda]]
# {{Flagicon|USA}} [[Sloane Stephens]] / {{Flagicon|USA}} [[Mashona Washington]]

{{Col-end}}

=== Mixed doubles wildcard entries ===
# {{Flagicon|USA}} [[Mallory Cecil]] / {{Flagicon|USA}} [[Devin Britton]]
# {{Flagicon|USA}} [[Jill Craybas]] / {{Flagicon|USA}} [[Eric Butorac]]
# {{Flagicon|USA}} '''[[Carly Gullickson]]''' / {{Flagicon|USA}} '''[[Travis Parrott]]''' '''(champions)'''
# {{Flagicon|USA}} [[Angela Haynes]] / {{Flagicon|USA}} [[Travis Rettenmaier]]
# {{Flagicon|USA}} [[Melanie Oudin]] / {{Flagicon|USA}} [[Rajeev Ram]]
# {{Flagicon|USA}} [[Shenay Perry]] / {{Flagicon|USA}} [[Scoville Jenkins]]
# {{Flagicon|USA}} [[Abigail Spears]] / {{Flagicon|USA}} [[Robert Kendrick]]

== Qualifiers ==
Below are the lists of the [[Tennis terminology#Q|qualifiers]] entering the [[Tennis terminology#M|main draw]].
{{Col-begin}}
{{Col-2}}

=== Men's singles ===
{{main|2009 US Open – Men's singles qualifying}}
# {{Flagicon|BRA}} [[Thomaz Bellucci]]
# {{Flagicon|ARG}} [[Horacio Zeballos]]
# {{Flagicon|USA}} [[Michael Yani]]
# {{Flagicon|TUR}} [[Marsel İlhan]]
# {{Flagicon|FRA}} [[Josselin Ouanna]]
# {{Flagicon|USA}} [[Jesse Witten]]
# {{Flagicon|GER}} [[Dieter Kindlmann]]
# {{Flagicon|COL}} [[Alejandro Falla]]
# {{Flagicon|CAN}} [[Peter Polansky]]
# {{Flagicon|GER}} [[Michael Berrer]]
# {{Flagicon|ARG}} [[Juan Pablo Brzezicki]]
# {{Flagicon|AUS}} [[Carsten Ball]]
# {{Flagicon|SUI}} [[Marco Chiudinelli]]
# {{Flagicon|ECU}} [[Giovanni Lapentti]]
# {{Flagicon|USA}} [[Donald Young (tennis)|Donald Young]]
# {{Flagicon|IND}} [[Somdev Devvarman]]

;Lucky losers
# {{Flagicon|AUS}} [[Peter Luczak]]
# {{Flagicon|POR}} [[Rui Machado]]
{{Col-2}}

=== Women's singles ===
{{main|2009 US Open – Women's singles qualifying}}
# {{Flagicon|TPE}} [[Chang Kai-chen]]
# {{Flagicon|AUS}} [[Anastasia Rodionova]]
# {{Flagicon|JPN}} [[Yurika Sema]]
# {{Flagicon|POL}} [[Marta Domachowska]]
# {{Flagicon|GER}} [[Angelique Kerber]]
# {{Flagicon|AUS}} [[Monique Adamczak]]
# {{Flagicon|CZE}} [[Eva Hrdinová]]
# {{Flagicon|CRO}} [[Petra Martić]]
# {{Flagicon|USA}} [[Shenay Perry]]
# {{Flagicon|RUS}} [[Vesna Dolonc|Vesna Manasieva]]
# {{Flagicon|USA}} [[Carly Gullickson]]
# {{Flagicon|CZE}} [[Barbora Strýcová|Barbora Záhlavová-Strýcová]]
# {{Flagicon|UKR}} [[Mariya Koryttseva]]
# {{Flagicon|CAN}} [[Valérie Tétreault]]
# {{Flagicon|FRA}} [[Camille Pin]]
# {{Flagicon|AUT}} [[Yvonne Meusburger]]

{{Col-end}}

== Protected ranking ==
The following players were accepted directly into the main draw using a protected ranking:
{{Col-begin}}
{{Col-2}}

;Men's Singles
* {{flagicon|ARG}} [[Juan Ignacio Chela]]
* {{flagicon|ROU}} [[Andrei Pavel]]
{{Col-2}}

;Women's Singles
* {{flagicon|USA}} [[Laura Granville]]
* {{flagicon|USA}} [[Meghann Shaughnessy]]
{{Col-end}}

== Withdrawals ==
{{col-begin}}
{{col-2}}
;Men's Singles
* {{flagicon|CRO}} [[Mario Ančić]] → replaced by {{flagicon|SVK}} [[Karol Beck]]
* {{flagicon|USA}} [[Mardy Fish]] → replaced by {{flagicon|POR}} [[Rui Machado]]
* {{flagicon|CZE}} [[Ivo Minář]] → replaced by {{flagicon|USA}} [[Rajeev Ram]]
* {{flagicon|ESP}} [[Carlos Moyá]] → replaced by {{flagicon|ECU}} [[Nicolás Lapentti]]
* {{flagicon|LUX}} [[Gilles Müller]] → replaced by {{flagicon|URU}} [[Pablo Cuevas]]
* {{flagicon|ARG}} [[David Nalbandian]] → replaced by {{flagicon|ESP}} [[Iván Navarro (tennis)|Iván Navarro]]
* {{flagicon|BEL}} [[Kristof Vliegen]] → replaced by {{flagicon|AUS}} [[Peter Luczak]]
{{col-2}}
;Women's Singles
* {{flagicon|SVK}} [[Dominika Cibulková]] → replaced by {{flagicon|ITA}} [[Alberta Brianti]]
* {{flagicon|FRA}} [[Nathalie Dechy]] → replaced by {{flagicon|NED}} [[Arantxa Rus]]
* {{flagicon|GBR}} [[Anne Keothavong]] → replaced by {{flagicon|FRA}} [[Séverine Beltrame|Séverine Brémond Beltrame]]
* {{flagicon|AUT}} [[Tamira Paszek]] → replaced by {{flagicon|CAN}} [[Stéphanie Dubois]]
{{col-end}}

== Prize money ==
<ref name="2009 Prize money">{{cite web|work=usopen.org |title=2009 Prize money |url=http://www.usopen.org/en_US/about/history/prizemoney.html?promo=topnav |access-date=September 13, 2009 |archive-url=https://web.archive.org/web/20090828165138/http://www.usopen.org/en_US/about/history/prizemoney.html?promo=topnav |archive-date=August 28, 2009 |url-status=dead }}</ref>

{| class="wikitable" style="text-align:right;"
|-
! Category
! Amount
|-
| style="text-align:left;"| Total prize money
| $21,664,000
|-
| style="text-align:left;"| Men's singles winner
| $1,600,000
|-
| style="text-align:left;"| Men's singles runner-up
| $800,000
|-
| style="text-align:left;"| Women's singles winner
| $1,600,000
|-
| style="text-align:left;"| Women's singles runner-up
| $800,000
|-
| style="text-align:left;"| Men's doubles winners
| $420,000
|-
| style="text-align:left;"| Men's doubles runners-up
| $210,000
|-
| style="text-align:left;"| Women's doubles winners
| $420,000
|-
| style="text-align:left;"| Women's doubles runners-up
| $210,000
|-
| style="text-align:left;"| Mixed doubles winners
| $150,000
|-
| style="text-align:left;"| Mixed doubles runners-up
| $70,000
|}

== Media coverage ==
{| class="wikitable"
|-
! Country
! Broadcasters
|-
| {{flagu|United States}} || [[CBS]]<br/>[[ESPN2]]<br/>[[Tennis Channel]]
|-
| {{flagu|Canada}} || [[The Sports Network|TSN]]<br/>[[Reseau des Sports|RDS]]<br/>[[TSN2]]
|-
| {{flagu|Brazil}} || [[ESPN Brasil]]<br/>[[SporTV]]
|-
| {{flagu|United Kingdom}} || [[Sky Sports|Sky Sports 2]]<br/>[[Sky Sports|Sky Sports Xtra]]<br/>[[Eurosport]]
|-
| {{flagu|Switzerland}} || [[SF zwei]]<br/>[[Eurosport]]
|-|-
| {{flagu|France}} || [[Canal+ (French TV channel)|Canal +]]<br/>[[Eurosport]]
|-
| {{flagu|Germany}} || rowspan="8"|[[Eurosport]]<br/>[[Eurosport 2]]
|-
| {{DNK}}
|-
| {{FIN}}
|-
| {{BUL}}
|-
| {{ROU}}
|-
| {{HUN}}
|-
| {{flag|Serbia|2004}}
|-
| {{flagu|Italy}}
|-
| {{POR}} || [[RTP1|RTP]]<br />[[RTP 2]]<br />[[Eurosport]]<br/>[[Eurosport 2]]
|-
| {{flagu|Belgium}} || [[Vlaamse Radio- en Televisieomroep|VRT]]
|-
| {{flagu|Spain}} || [[Digital +|Digital plus]]<br/>[[Antena 3 (Spain)|Antena 3]]
|-
| {{flagu|India}} || rowspan="2"|[[Ten Sports]]
|-
| {{PAK}}
|-
| {{flagu|Japan}} || [[WOWOW]]
|-
| {{flagu|China}} || [[CCTV-5]]
|-
| {{THA}} || [[TrueVisions]]
|-
| {{PHI}} || [[Balls (TV channel)|Balls]]
|}

== References ==
{{reflist|2}}

== External links ==
{{Commons category}}
{{Portal|Tennis}}
* [https://web.archive.org/web/20040426001041/http://www.usopen.org/home/default.sps Official website of US Open]

{{S-start}}
{{s-bef|before=[[2009 Wimbledon Championships]]}}
{{s-ttl|title=[[Grand Slam (tennis)|Grand Slams]]}}
{{s-aft|after=[[2010 Australian Open]]}}
{{s-bef|before=[[2009 Pilot Pen Tennis|New Haven]]}}
{{s-ttl|title=[[2009 US Open Series]]}}
{{s-aft|after=None}}
{{S-end}}

{{US Open championships}}
{{2009 US Open Series}}
{{2009 ATP World Tour}}
{{2009 WTA Tour}}
{{2009 in tennis}}
{{Tennis on CBS}}

{{DEFAULTSORT:2009 Us Open (Tennis)}}
[[Category:2009 US Open (tennis)| ]]
[[Category:2009 US Open Series|U.S. Open]]
[[Category:2009 in tennis|U.S. Open]]
[[Category:2009 in American tennis|U.S. Open]]
[[Category:US Open (tennis) by year]]
[[Category:2009 in sports in New York City|U.S. Open]]
[[Category:August 2009 sports events in the United States|U.S. Open]]
[[Category:September 2009 sports events in the United States|U.S. Open]]

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