Injury forces Nadal out of U.S. Open
August 15, 2012 -- Updated 1725 GMT (0125 HKT)
Nadal has not played since a surprise early exit at this year's Wimbledon.
- Last year's runner-up Rafael Nadal withdraws from the U.S. Open
- Spanish player has already missed Olympics and North American events
- Nadal lost to Novak Djokovic in last year's final in New York
- Former world number one has a history of knee problems
(CNN) -- World No. 3 Rafael Nadal has been forced to withdraw from the U.S. Open due to an ongoing knee complaint, the Spanish tennis star announced on Wednesday.
The French Open champion has a history of knee problems, and has not played since a surprise second-round defeat at Wimbledon in June.
The former world number one was unable to defend his Olympic title in London, and the the 26-year-old had to pull out of last week's tournament in Toronto as well as this week's event in Cincinnati.
"I am very sad to announce that I am still not ready to play and have to withdraw from this year's U.S. Open in NYC," Nadal told the U.S. Open website ahead of the season's final grand slam, which runs from August 27-September 9.
Nadal reveals heartache at Games
Roger Federer of Switzerland celebrates after defeating Andy Murray of Great Britain to win his 7th Wimbledon championship in London on Sunday, July 8. Visit CNN.com/tennis for complete coverage.
Men's singles Wimbledon Championship
"I am sorry since I always found great crowds and great support, but I have to continue with my recuperation and preparation to be ready to play in the right conditions."
Nadal, who was beaten in last year's final by Novak Djokovic, missed large spells of the 2007 season due to knee problems and had to withdraw from the 2008 end-of-season championship plus the Davis Cup final due to similar troubles.
In 2009, Nadal was unable to defend his Wimbledon title after he was diagnosed with tendinitis in both knees, and he has occasionally missed tournaments since to try to manage the problem.
In March this year, he was forced to withdraw before his semifinal at the Miami Masters tournament due to the injury.
However, he managed to play a full clay-court season, winning three titles before clinching a record seventh French Open at Roland Garros.
Nadal then lost in the quarterfinals of the Halle grass event in Germany, and was beaten at Wimbledon by 100th-ranked Czech Lukas Rosol.
Part of complete coverage on
December 5, 2013 -- Updated 1517 GMT (2317 HKT)
South Africa may just have found another Paralympian to inspire a nation -- and perhaps the world.
November 26, 2013 -- Updated 1253 GMT (2053 HKT)
Marion Bartoli's tennis career had its ups and downs -- both personal and professional. Discover what has made the Wimbledon winner happy.
November 22, 2013 -- Updated 1654 GMT (0054 HKT)
Maria Sharapova has turned to her third coach of 2013 as she seeks to bounce back from shoulder problems.
November 21, 2013 -- Updated 1158 GMT (1958 HKT)
Hitting partner Sascha Bajin and coach Patrick Mouratoglou offer a glimpse into the life of the world No. 1.
November 29, 2013 -- Updated 1706 GMT (0106 HKT)
Down and out in Paris, Serena Williams turned to a man who has helped her become more dominant than ever before.
November 20, 2013 -- Updated 1003 GMT (1803 HKT)
World Anti-Doping Agency president John Fahey tells CNN he doesn't think Novak Djokovic "has the faintest idea" what his organization does.
The Davis Cup can step up to a new level of popularity by following the example of football's top tournament, says CNN's Will Edmonds.
November 12, 2013 -- Updated 1546 GMT (2346 HKT)
A year that began with a fourth Australian Open title ended similarly triumphant for Novak Djokovic at the ATP Tour finale.
CNN's Will Edmonds says Serena Williams can match Steffi Graf's record haul of 22 grand slam titles following her U.S. Open triumph.
September 9, 2013 -- Updated 1224 GMT (2024 HKT)
Two years after losing part of her lung during a blood clot operation, U.S. Open champion Serena Williams insists playing tennis "is just fun now."
September 4, 2013 -- Updated 1130 GMT (1930 HKT)
Her doubles playing dad is the sporting star of the family, but Micaela Bryan's Twitter page is making the toddler a viral sensation.
Roger Federer is now in danger of diminishing his incredible tennis legacy, says CNN's Will Edmonds.
August 27, 2013 -- Updated 1107 GMT (1907 HKT)
Tennis parents don't have the best of reputations. Think Damir Dokic, John Tomic and Jim Pierce. However, Andy Murray's Mum is very different.
August 15, 2013 -- Updated 1421 GMT (2221 HKT)
Marion Bartoli has retired from tennis with immediate effect, just six weeks after winning her first grand slam title at Wimbledon.
November 19, 2013 -- Updated 1310 GMT (2110 HKT)
When the women's singles champion at the U.S. Open picks up her $2.6 million check, she should spare a moment to thank Billie Jean King.
Today's five most popular stories