AP Photo/Kathy Willens
Workers attempt to dry the court after play was suspended because of rain during a match between Rafael Nadal of Spain and Fernando Gonzalez of Chile at the U.S. Open tennis tournament in New York, Thursday, Sept. 10, 2009.
AP Photo/Charles Krupa
Carly Gullickson, right, of the United States and her partner Travis Parrott, also of the U.S., hold up their trophy after defeating Leander Paes, left, of India, and Cara Black, of Zimbabwe, in the mixed doubles championship at the U.S. Open tennis tournament in New York, Thursday, Sept. 10, 2009. Parrot and Gullickson won in straight sets.
AP Photo/Elise Amendola
Serena Williams, left, of the U.S., watches as her sister Venus returns a shot to Alisa Kleybanova, of Russia, and Ekaterina Makarova, of Russia, during their doubles match at the U.S. Open tennis tournament in New York, Thursday, Sept. 10, 2009.
AP Photo/Darron Cummings
Rafael Nadal's cleched fist is visible behind his racket during his match with Fernando Gonzalez of Chile at the U.S. Open tennis tournament in New York, Thursday, Sept. 10, 2009.
AP Photo/Charles Krupa
Juan Martin del Potro, of Argentina, reacts afer missing a point against Marin Cilic, of Croatia, during their match at the U.S. Open tennis tournament in New York, Thursday, Sept. 10, 2009.
AP Photo
Roger Federer of Switzerland returns to Robin Soderling of Sweden in their quarterfinal match at the U.S. Open tennis tournament in New York on Sept. 9, 2009. Federer won 6-0, 6-3, 6-8, 8-6 to reach the semifinals.
AP Photo/Amy Sancetta
Yanina Wickmayer, of Belgium, reacts after winning a point over Kateryna Bondarenko, of Ukraine, during their match at the U.S. Open tennis tournament in New York, Wednesday, Sept. 9, 2009. The 50th-ranked Wickmayer, never before past the second round at a major tournament beat Kateryna Bondarenko of Ukraine 7-5, 6-4.
AP Photo/Amy Sancetta
Kateryna Bondarenko, of Ukraine, prepares to serve to her opponent Yanina Wickmayer, of Belgium, during their match at the U.S. Open tennis tournament in New York, Wednesday, Sept. 9, 2009.
AP Photo/Darron Cummings
Caroline Wozniacki, of Denmark, grimaces as she returns a shot to Melanie Oudin, of the United States, during their match at the U.S. Open tennis tournament in New York, Wednesday, Sept. 9, 2009. Wozniacki won 6-2, 6-2.
AP Photo/Charles Krupa
Melanie Oudin, of the United States, returns a shot to Caroline Wozniacki, of Denmark, during their match at the U.S. Open tennis tournament in New York, Wednesday, Sept. 9, 2009.
AP Photo/Elise Amendola
Novak Djokovic, of Serbia, reaches out to return a shot from Fernando Verdasco, of Spain, during their match at the U.S. Open tennis tournament in New York, Wednesday, Sept. 9, 2009. Djokovic, who eliminated Verdasco 7-6 (2), 1-6, 7-5, 6-2.
AP Photo/Darron Cummings
Rafael Nadal of Spain reacts after beating Gael Monfils of France 6-7 (3), 6-3, 6-1, 6-3 during the quarterfinals of the U.S. Open tennis tournament in New York, Tuesday, Sept. 8, 2009.
AP Photo/Kathy Willens
Kim Clijsters of Belgium grimaces as she returns a backhand to Li Na of China during the quarterfinals of the U.S. Open tennis tournament in New York, Tuesday, Sept. 8, 2009.
AP Photo/Charles Krupa
Serena Williams of the United States celebrates after beating Flavia Pennetta of Italy 6-4, 6-3 during the quarterfinals of the U.S. Open tennis tournament in New York, Tuesday, Sept. 8, 2009.
AP Photo/Elise Amendola
Fernando Gonzalez of Chile returns to Jo-Wilfried Tsonga of France at the U.S. Open in New York Tuesday, Sept. 8, 2009. Gonzalez won 3-6, 6-3, 7-6(3), 6-4.
AP Photo/Amy Sancetta
Andy Murray of Britain, right, returns a shot to Marin Cilic of Croatia during the quarterfinals of the U.S. Open tennis tournament in New York, Tuesday, Sept. 8, 2009.
AP Photo/Charles Krupa
Novak Djokovic of Serbia reacts during the third set against Radek Stepanek of the Czech Republic during their match at the U.S. Open tennis tournament in New York, Monday, Sept. 7, 2009. Djokovic won in straight sets 6-1, 6-3, 6-3.
AP Photo/Darron Cummings
Caroline
AP Photo/Amy Sancetta
Melanie Oudin of the United States reacts during her match against Nadia Petrova of Russia at the U.S. Open tennis tournament in New York, Monday, Sept. 7, 2009. Oudin upset Nadia Petrova of Russia 1-6, 7-6(2), 6-3.
AP Photo/Paul J. Bereswill
Fernando Verdasco of Spain returns to John Isner of the United States at the U.S. Open tennis tournament in New York, Monday, Sept. 7, 2009. Verdasco defeated John Isner, 4-6, 6-4, 6-4, 6-4.