Novak Djokovic of Serbia celebrates his 2-6, 6-1, 6-4, 6-2 win over David Ferrer of Spain in the men's singles semifinal match at the 2012 U.S. Open on Sunday, September 9. The tournament, the last grand slam event of the year, continues through Monday in Queens, New York.
(CNN) -- Kim Clijsters' glittering singles career came to a surprise end on Wednesday, as British teenager Laura Robson recorded a shock 7-6 7-6 win in the second round of the U.S. Open.
Clijsters announced earlier this year she would retire for the second time following the season's closing grand slam in New York, as she wants to spend more time with her family.
Robson, who recently won silver in the mixed doubles at the London Olympics, is ranked 89th in the world and wasn't expected to pose much of a challenge to the three-time U.S. Open champion. However, the former world No. 1 struggled to find an answer to her 18-year-old opponent's impressive serve.
"I'm happy that in the last year and a half or even two years, it's been kind of up and down, and I'm happy that I stuck through it and I was able to kind of live a lot of these emotions that I've had in these 18 months or so. I'm proud of myself that I was able to do that," said Clijsters, who will play in the women's doubles and mixed doubles at Flushing Meadows.
The 29-year-old, now ranked 25th, has struggled with injury this year since reaching the semifinals of January's Australian Open, a tournament she won last year.
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Robson was only nine years old when Clijsters last lost a match at the U.S. Open -- which she won for the first time in 2005 then again after her retirement in 2009 and 2010 before missing out with injury last year. Clijsters has 41 tour titles to her name, behind only the Williams sisters among still active players, while Robson has yet to claim her first tournament victory.
Robson will now face Chinese ninth seed Li Na, and Clijsters tipped the 2008 Wimbledon girls' champion as a future star.
"Physically if she gets better, even more explosive, then I think she's going to be a great player, and someone that I'll be keeping an eye on," she said.
World No. 1 Victoria Azarenka and third seed Maria Sharapova breezed through their second-round matches, as did defending champion Samantha Stosur.
Azarenka defeated another Belgian, 133rd-ranked Kirsten Flipkens, taking only 27 minutes to record a 6-2 6-2 victory and set up a last-32 clash with Chinese 28th seed Zheng Jie
"I think it was another good performance today," the Australian Open champion said.
"It wasn't as easy maybe as the score was, but I think I played well. I always take it match by match no matter where it is, whatever my ranking is. I have been doing it for pretty much my whole career."
Sharapova, the 2006 U.S. Open winner, steamrolled over Spain's Lourdes Dominguez Lino 6-0 6-1 in 54 minutes.
The French Open champion, the highest-paid sportswoman in the world, will next face someone at the other end of the financial scale -- American amateur Mallory Burdette.
Burdette eliminated Czech doubles specialist Lucie Hradecka, who ranked 69th is 183 places higher in the WTA list, and would have pocketed $65,000 so far if she could accept it.
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However, she would forfeit her place at Stanford University by becoming a professional athlete.
"I have already checked the amateur box, so if I know correctly, you can't go back once the tournament starts. So it's done," said the 21-year-old, whose only other grand slam appearance was a first-round defeat in New York six years ago.
"At this point, I'm used to giving the money up, I think the money goes straight back to the tournaments if I don't declare it, so they probably love me at this point!"
Burdette was encouraged to sample the pro tour by Stanford tennis coach Lele Forood.
"I wasn't sure if I even wanted to play tennis as a career, but Lele was so supportive and encouraged me to give it a shot," she explained.
"I really want to be a psychiatrist. So I was interested in med school. I would have finished up my degree and I would have gone to some type of program where I could take all my pre-med requirements and then hopefully go to med school.
"I had given that a lot of thought at the beginning of the summer and I was preparing for that. I still am in a lot of ways, but my success this summer has kind of taken me in a different path a little bit. So I think my focus will be a little bit different when I go back to school."
Fifth seed Petra Kvitova also went through to the third round, beating former world No. 11 Alize Cornet 6-4 6-4 to earn a clash with another French player, 90th-ranked Pauline Parmentier.
The Czech, who won her maiden grand slam last year at Wimbledon, took just 78 minutes to beat Cornet, now ranked 50th.
Seventh seed Stosur will next play Uzbekistan-born American Varvara Lepchenko, with the Australian beating Romania's Edina Gallovits-Hall 6-3 6-0.
Stosur has had mixed fortunes since winning the title a year ago, losing in the first round of her home grand slam, reaching the last four at the French Open and exiting in the second round at Wimbledon and the first hurdle at the Olympics.
Kvitova's 15th-seeded compatriot Lucie Safarova also went through, beating Canadian Aleksandra Wozniak 6-3 4-6 6-2.
She will next face Russian 19th seed Nadia Petrova, who ended the hopes of Romania's world No. 53 Simona Halep.
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Djokovic serves to Ferrer as their match resumes Sunday after being delayed Saturday because of inclement weather.
Ferrer returns a shot to Djokovic on Sunday.
Djokovic reacts to winning a point against Ferrer during the match Sunday.
Ferrer, the No. 4 seed, serves to Djokovic, the No. 2 seed, Sunday.
Djokovic returns a shot against against Ferrer during their men's singles semifinal match of the 2012 US Open on Saturday, September 8. The match was stopped in the middle of the first set due to approaching severe weather and resumed on Sunday.
Ferrer follows through his shot against Djokovic on Saturday.
Djokovic comes down on the ball while playing Ferrer on Saturday.
Spectators evacuate the Arthur Ashe Stadium during Ferrer and Djokovic's match as severe weather approached on Saturday.
British Andy Murray returns a shot against Czech Tomas Berdych during his men's singles semifinal match in the 2012 U.S. Open on Saturday, September 8.
Murray of Great Britain argues with the chair umpire Pascal Maria and Berdych on Saturday after the wind blew his hat off during their match.
Berdych slams the ball onto Murray's side of the court on Saturday.
Murray celebrates after winning a point against Berdych on Saturday.
Rain falls on center court in Arthur Ashe stadium, causing officials to suspend play on day 13 of the 2012 U.S. Open on Saturday, September 8.
Grounds crew workers clear water during a rain delay on Saturday.
Belarus' Victoria Azarenka stares down the ball during her women's singles semifinals match against Russia's Maria Sharapova during the U.S. Open on Friday, September 7.
Sharapova returns a shot against Azarenka on Friday.
Stefan 'Redfoo' Gordy of the American electro duo LMFAO attends the women's singles semifinal match between Azarenka and Sharapova on Friday.
Victoria Azarenka of Belarus celebrates match point against Sharapova on Friday.
Sarah Errani of Italy serves in her match against Serena Williams of the United States during a women's singles semifinal match Friday.
Williams makes a return in her match against Errani.
Bob Bryan and Mike Bryan of the United States pose with their trophy after their men's doubles final match against Leander Paes of India and Radek Stepanek of the Czech Republic on Friday.
Novak Djokovic of Serbia celebrates match point during his men's singles quarterfinal match against Juan Martin del Potro of Argentina on Thursday, September 6.
Juan Martin del Potro returns a shot against Novak Djokovic on Thursday.
Djokovic returns a shot.
Juan Martin del Potro reacts at the net on Thursday.
Djokovic lunges to make a return.
Spain's David Ferrer celebrates his men's singles quarterfinal victory over Serbia's Janko Tipsarevic on Thursday.
Ferrer returns a shot against Tipsarevic during their quarterfinal match.
Tipsarevic makes a backhand return to Ferrer.
Tipsarevic slips on the court while attempting a return shot.
Ekaterina Makarova of Russia and Bruno Soares of Brazil celebrate after defeating Kristyna Pliskova of the Czech Republic and Marcin Matkowski of Poland to win their mixed doubles final match on Thursday.
Eugenie Bouchard of Canada returns a shot against Victoria Duval of the U.S. on Thursday.
Ipek Soylu of Turkey wipes her face during a break against American Chalena Scholl during their girl's juniors singles match on Thursday.
Andy Roddick of the United States salutes the crowd after losing his final career match to Juan Martin del Potro of Argentina in their men's singles fourth-round match at the 2012 U.S. Open on Wednesday, September 5.
Coach Larry Stefanki, left trainer Doug Spreen, wife Brooklyn Decker and agent Graham Cross watch Roddick in his final match on Wednesday.
Del Potro plays returns a backhand to Roddick on Wednesday.
Roddick chases down the ball during his match against del Potro on Wednesday. Roddick announced he would retire after this Grand Slam.
Russian Maria Sharapova serves to France's Marion Bartoli during their women's singles quarterfinal match on Wednesday.
Bartoli returns a shot against Sharapova on Wednesday.
NBA basketball player Tyson Chandler and his daughter Sacha-Marie attend the U.S. Open on Wednesday.
Serbia's Novak Djokovic pulls back to return a shot to Stanislas Wawrinka of Switzerland during his men's singles fourth-round match on Wednesday.
Wawrinka carries his broken racquet off the court during his match on Wednesday against Djokovic.
Italian Sara Errani returns a shot against countrywoman Roberta Vinci during Wednesday's women's singles quarterfinal match.
Vinci serves to fellow Italian Errani on Wednesday.
Serbian Janko Tipsarevic clenches his fist after a play against German Philipp Kohlschreiber on Wednesday.
France's Marion Bartoli reacts to a point against Maria Sharapova of Russia on Wednesday.
Attendants get the court ready for Wednesday's match between Bartoli and Sharapova.
Victoria Azarenka of Belarus celebrates after defeating Samantha Stosur of Australia to win their women's singles quarterfinals match on Tuesday, September 4.
David Ferrer of Spain returns a shot against Richard Gasquet of France during their men's singles fourth-round match on Tuesday.
Samantha Stosur of Australia returns a shot against Victoria Azarenka of Belarus on Tuesday.
Victoria Azarenka of Belarus reacts against Samantha Stosur of Australia on Tuesday.
Spectators shelter under umbrellas as rain delays play during the women's singles quarterfinal match between Maria Sharapova of Russia and Marion Bartoli of France on Tuesday.
Samantha Stosur of Australia makes a return shot in her women's singles match against Victoria Azarenka of Belarus.
Roberta Vinci serves as she and Italian teammate Sara Errani play a women's doubles quarterfinals match on Tuesday.
The braids of Victoria Azarenka of Belarus swing with her follow-through during her match on Tuesday.
A grounds crew dries the court Tuesday after rain suspended play.
Julia Goerges, left, of Germany and Kristyna Pliskova of the Czech Republic react after a point against Sara Errani and Roberta Vinci of Italy on Tuesday.
American Serena Williams returns a shot Monday.
Mike Bryan, right, and Bob Bryan of the United States bump chests in celebration during their doubles match against Santiago Gonzalez of Mexico and Scott Lipsky of the United States on Monday.
Sara Errani of Italy hits a return to Angelique Kerber of Germany during their women's singles match on Monday.
Marion Bartoli of France serves against Maria Sharapova of Russia on Tuesday.
Martin Klizan of Slovakia takes a tumble Monday.
Taylor Townsend of the United States serves during her doubles match on Monday.
Canadian player Milos Raonic of Canada prepares to serve on Monday.
Andy Roddick of the United States celebrates after defeating Fabio Fognini of Italy on Sunday, September 2.
Fognini wipes his face with a towel during his men's singles third-round match against Roddick.
Roddick returns a shot to Fognini.
Russia's Maria Sharapova returns a shot to Nadia Petrova of Russia and wins Sunday's match to move on to the quarterfinals.
Leonardo Mayer of Argentina hits a return to Juan Martin Del Potro of Argentina during their men's singles third-round match Sunday.
Anna Tatishvili of Georgia celebrates a point during her women's singles fourth-round match Sunday against Victoria Azarenka of Belarus.
Philipp Kohlschreiber of Germany returns a shot to John Isner of the United States on Sunday.
Novak Djokovic of Serbia waves to the crowd Sunday after winning his men's singles third-round match against Julien Benneteau of France.
Benneteau returns a shot to Djokovic.
Djokovic serves to Benneteau.
Lleyton Hewitt of Australia hits a return to David Ferrer of Spain during their men's singles match Sunday.
Fernando Verdasco of Spain returns a shot to top-ranked Roger Federer of Switzerland during their men's singles match at the U.S. Open on Saturday, September 1.
Switzerland's Roger Federer returns a shot to Spain's Fernando Verdasco.
Maria Kirilenko of Russia tapes her racquet handle during a break in her match against Czech Andrea Hlavackova.
Hlavackova returns a shot against Kirilenko.
Frenchman Jeremy Chardy stretches to make a return against Slovakia's Martin Klizan.
Serbian Jelena Jankovic serves against Poland's Agnieszka Radwanska.
Ana Ivanovic of Serbia plays a shot against American Sloane Stephens.
Spain's Nicolas Almagro returns a shot to Jack Sock of the United States.
Venus Williams of the United States watches a match.
Serena Williams of the United States returns a shot against Russia's Ekaterina Makarova in their third-round singles match.
Spain's Feliciano Lopez of Spain hits a return to Andy Murray of Great Britain.
Murray reacts after defeating Lopez.
Milos Raonic of Canada serves in his match against James Blake of the United States.
Roberta Vinci of Italy serves against Dominika Cibulkova of Slovakia during a women's singles third-round match.
Kei Nishikori of Japan serves the ball to Marin Cilic of Croatia during a men's singles match.
Australia's Lleyton Hewitt returns a shot to Luxembourg 's Gilles Muller in a men's singles second-round match.
Spectators inside a packed Arthur Ashe Stadium watch the second-round match between American Andy Roddick and Australia's Bernard Tomic.
Roddick celebrates a point during his men's singles second round match Tomic. Roddick, 30, who has announced he will retire after the U.S. Open, won in three sets.
Maria Sharapova of Russia returns a shot against Mallory Burdette of the United States during their women's singles third-round match.
Ryan Harrison of the United States reacts after a point against Juan Martin Del Potro of Argentina in a second- round singles match. Del Potro won in four sets.
Czech Lucie Safarova serves to Russian Nadia Petrova of Russia during their third round match.
Jarkko Nieminen of Finland serves against John Isner of the United States.
American Steve Johnson returns a shot against Latvian Ernests Gulbis.
Samantha Stosur of Australia serves the ball against Varvara Lepchenko of the United States during their third-round match.
David Ferrer of Spain serves against Igor Sijsling of the Netherlands.
Varvara Lepchenko of the United States returns against Samantha Stosur of Australia.
Samantha Stosur of Australia serves against Varvara Lepchenko of the United States during a women's singles third round match.
Angelique Kerber of Germany celebrates match point after her women's second round match against Venus Williams of the United States on Day Four of the 2012 US Open on Thursday, August 30.
Venus Williams of the United States reacts during her women's second round match against Angelique Kerber of Germany.
Ana Ivanovic of Serbia returns a shot against Sofia Arvidsson of Sweden during their women's singles second-round match.
A ball boy stands by during the match between Kei Nishikori of Japan and Tim Smyczek of the United States.
Maria Kirilenko of Russia serves against Greta Arn of Hungary.
Pablo Andujar of Spain serves against Feliciano Lopez of Spain during their men's singles second-round match.
Jo-Wilfried Tsonga of France jumps over the net while trying to return a shot against Martin Klizan of Slovakia.
Andy Murray of Great Britain plays a backhand during a practice session.
Nicolas Almagro of Spain lies on the court as he celebrates match point after his men's singles second-round match against Philipp Petzschner of Germany.
Philipp Petzschner of Germany reacts during his men's singles second round-match against Nicolas Almagro of Spain.
Philipp Petzschner of Germany slides during his men's singles second-round match against Nicolas Almagro of Spain.
Mardy Fish of the United States celebrates after defeating Nikolay Davydenko of Russia.
Tatjana Malek of Germany returns a shot during her women's singles second-round match against Sloane Stephens of the United States.
Sloane Stephens of the United States returns a shot during her women's singles second-round match against Tatjana Malek of Germany.
Sloane Stephens of the United States reacts during her women's singles second-round match against Tatjana Malek of Germany.
Kim Clijsters of Belgium reacts during her second round match loss to Laura Robson of Great Britain.
Italian Andreas Seppi hits a backhand during his men's singles first-round match against Spaniard Tommy Robredo.
Serbian Janko Tipsarevic serves against Guillaume Rufin of France.
Sisters and doubles partners Venus Williams, left, and Serena Williams of the U.S. take on U.S. players Mallory Burdette and Nicole Gibbs during their women's doubles first-round match.
France's Alize Cornet returns a shot during her women's singles second-round match against Czech Petra Kvitova.
Mikhail Youzhny of Russia reacts during his match against Gilles Muller of Luxembourg.
U.S. players Bob Bryan and Mike Bryan chest bump after winning match point in their men's doubles first-round match against Belgian players David Goffin and Steve Darcis.
Juan Martin Del Potro of Argentina serves against Florent Serra of France.
Spain's Tommy Robredo poaches the ball during his men's singles first-round match against Italian Andreas Seppi.
The water fountain under the iconic unisphere produces a rainbow at the grounds of the National Tennis Center.
Bulgaria's Grigor Dimitrov serves to France's Benoit Paire.
Australian Samantha Stosur returns a shot during her women's singles second-round match against Romanian Edina Gallovits-Hall.
Benoit Paire of France wipes his face during his men's singles first-round match against Bulgarian Grigor Dimitrov.
Luxembourg fans cheer on Mandy Minella during her women's singles second-round match against Czech Kristyna Pliskova.
Australian Lleyton Hewitt tosses his racquet during his men's singles first-round match against German Tobias Kamke.
Spain's David Ferrer returns a shot against South African Kevin Anderson.
Belgian Kim Clijsters, left, congratulates Britain's Laura Robson after their match.
Latvian Ernests Gulbis stretches for the fall during his men's singles first-round match against German Tommy Haas.
Venus Williams, left, and Serena Williams tap hands during their women's doubles first-round match.
Australian Casey Dellacqua serves against China's Na Li during their second-round match.
Britain's Johanna Konta serves to Hungarian Timea Babos during their women's singles first-round match on Day Two of the 2012 U.S. Open.
Serbia's Ana Ivanovic serves to Ukraine's Elina Svitolina during their women's singles first-round match.
Serbian Novak Djokovic looks on against Italian Paolo Lorenzi during their men's single first-round match.
France's Edouard Roger-Vasselin serves the ball against Italian Fabio Fognini of Italy.
Anne Keothavong of Great Britain returns a shot during her first-round match against Angelique Kerber of Germany.
France's Jo-Wilfried Tsonga serves the ball against Karol Beck of Slovakia.
American Venus Williams returns to Bethanie Mattek-Sands of the United States.
Andrea Hlavackova of the Czech Republic celebrates after defeating Klara Zakopalova, also of the Czech Republic, in the first round.
Italy's Roberta Vinci returns a shot against Poland's Urszula Radwanska.
A worker climbs a ladder to adjust the board displaying the women's draw.
Slovakia's Karol Beck stretches to return a backhanded shot against France's Jo-Wilfried Tsonga.
Fans wait for an autograph from U.S. player Andy Roddick after he defeated U.S. player Rhyne Williams.
American Andy Roddick hits the ball against countryman Rhyne Williams during their first-round 2012 U.S. Open match in New York on Tuesday, August 28.
Roddick wears patriotic shoes for his match against Williams.
Golfer Sergio Garcia of Spain signs an autograph for a fan as James Blake of the United States and Lukas Lacko of Slovakia compete.
Jo-Wilfried Tsonga of France serves against Karol Beck of Slovakia during their first-round match on day two.
Agnieszka Radwanska of Poland selects tennis balls during a match against Nina Bratchikova of Russia.
Tomas Berdych of the Czech Republic hits against David Goffin of Belguim during their men's first-round match.
Roberta Vinci of Italy celebrates a shot against Urszula Radwanska of Poland.
Agnieszka Radwanska returns to Bratchikova.
Angelique Kerber of Germany returns a shot during her women's singles first-round match against Anne Keothavong of Great Britain.
Fireworks expload over Arthur Ashe Stadium during the opening ceremonies of the 2012 U.S. Open on Monday, August 27.
Fans watch fireworks as actress/singer Jordin Sparks performs the national anthem during the opening ceremonies.
Switzerland's Roger Federer serves to American Donald Young during their men's singles first-round match.
Donald Young reacts during his match against Roger Federer.
Roger Federer returns a shot to Donald Young.
Alec Baldwin, center, and his wife, Hilaria Thomas, right, watch the first day of action Monday at the U.S. Open.
A downpour interrupts play Monday at Flushing Meadows.
France's Marion Bartoli serves during her women's singles first-round match against American Jamie Hampton.
American James Blake celebrates a point during his men's singles first-round match against Lukas Lacko of Slovakia.
Russian Alex Bogomolov Jr. stretches to play a backhand against Andy Murray of Great Britain during their men's singles first-round match.
Andy Murray shakes hands at the net with Alex Bogomolov Jr. after winning his men's singles first-round match.
American Melanie Oudin returns a shot during her women's singles first-round match against Lucie Safarova of the Czech Republic.
Florian Mayer of Germany serves to American Jack Sock.
Belgium's Kim Clijsters moves to return a shot during her women's singles first-round match against American Victoria Duval.
A spectator in a kangeroo costume cheers from the stands during the match between Tatsuma Ito of Japan and Matthew Ebden of Australia.
Maria Sharapova of Russia returns a shot to Melinda Czink of Hungary.
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