US tennis player Melanie Oudin returns a point to Danish player Caroline Wozniacki during their quarterfinals match of the 2009 US Open at the USTA Billie Jean King National...

NEW YORK - SEPTEMBER 09: Melanie Oudin of the United States returns a shot against Caroline Wozniacki of Denmark during day ten of the 2009 U.S. Open at the USTA Billie Jean...

Belgium player Yanina Wickmayer returns against Danish tennis player Caroline Wozniacki in their semifinal match of the 2009 US Open at the USTA Billie Jean King National...

Danish tennis player Caroline Wozniacki returns against Belgium player Yanina Wickmayer in their semifinal match of the 2009 US Open at...

Serena Williams of the US eyes the ball before returning it to Denmark's Caroline Wozniacki during their WTA Championships semi-final tennis match at the Khalifa International Tennis and Squash Complex...

...Elena Dementieva of Russia, Victoria Azarenka of Belarus, Dinara Safina of Russia, Jelena Jankovic of Serbia, Caroline Wozniacki of Denmark and Venus William of United States line up during the draw for the Sony...

Kim Clijsters from Belgium against Caroline Wozniacki from Denmark during the Women's Final US Open match at the USTA Billie Jean King...

Caroline Wozniacki of Denmark smashes the ball against Samantha Stosur of Australia during the semi-final match of...

NEW YORK - SEPTEMBER 09: Melanie Oudin of the United States returns a shot against Caroline Wozniacki of Denmark during day ten of the 2009 U.S. Open at the USTA Billie Jean...

NEW YORK - SEPTEMBER 13: Kim Clijsters of Belgium kisses the championship trophy after defeating Caroline Wozniacki of Denmark in the Women�s Singles final on day fourteen of the 2009 U...

NEW YORK - SEPTEMBER 13: Kim Clijsters of Belgium holds up the championship trophy after defeating Caroline Wozniacki of Denmark in the Women�s Singles final on day fourteen of the 2009 U...

NEW YORK - SEPTEMBER 13: Kim Clijsters of Belgium celebrates after defeating Caroline Wozniacki of Denmark during the Women s Singles final on day fourteen of the 2009 U.S...

NEW YORK - SEPTEMBER 13: Kim Clijsters of Belgium returns a shot to Caroline Wozniacki of Denmark during the Women�s Singles final on day fourteen of the 2009 U...

Caroline Wozniacki, of Denmark, reaches out to return a volley from Kim Clijsters, of Belgium, during the women...

Kim Clijsters, of Belgium, returns a shot to Caroline Wozniacki, of Denmark, during the women's championship match at the U.S. Open tennis tournament in...