Caroline Wozniacki of Denmark smashes the ball against Samantha Stosur of Australia during the semi-final match of the Japan Open women's tennis tournament in...

NEW YORK - SEPTEMBER 02: Vania King of the United States returns a shot against Samantha Stosur of Australia during day three of the 2009 U.S. Open at the USTA Billie Jean...

...Images) : STANFORD, CA - JULY 31: Serena Williams runs to get the ball during her match against Samantha Stosur of Australia in the quarterfinals on Day 5 of the Bank of the West Classic July...

US Venus Williams and US Serena Williams play against Australia's Samantha Stosur and Australia's Rennae Stabbs during their doubles match on Day 11 at the 2009 Wimbledon...

Flavia Pennetta, of Italy, poses with a trophy after defeating Samantha Stosur, of Australia, in a final match at Los Angeles Women's Tennis Championships in Carson, Calif...

STANFORD, CA - JULY 31: Serena Williams reacts to a missed point against Samantha Stosur of Australia during their quarterfinal match on Day 5 of the Bank of the West Classic...

Russia's Svetlana Kuznetsova returns the ball to Australia's Samantha Stosur during their semifinal match of the French Open tennis tournament at the Roland Garros stadium in...

...JUNE 04: Svetlana Kuznetsova of Russia serves during the Women's Singles Semi Final match against Samantha Stosur of Australia on day Twelve of the French Open at Roland Garros on June 4, 2009...

...read LIONEL BONAVENTURE/AFP/Getty Images) Russia's Svetlana Kuznetsova returns a ball to Australia's Samantha Stosur during a French Open tennis semi-final match on June 4, 2009 at Roland Garros Stadium...

Russia's Svetlana Kuznetsova reacts after a missing point as she plays Australia's Samantha Stosur during their semifinal match of the French Open tennis tournament at the Roland Garros stadium in...

Russia's Svetlana Kuznetsova returns a ball to Australia's Samantha Stosur during a French Open tennis semi-final match on June 4, 2009 at Roland Garros Stadium...

Australia's Samantha Stosur returns a ball to Roumania's Sorana Cirstea during a French Open tennis quarter final match...

Australia's Samantha Stosur returns the ball to Romania's Sorana Cirstea during their quarterfinal match of the French Open...

KEY BISCAYNE, FL - MARCH 29: Dinara Safina of Russia returns a shot against Samantha Stosur of Australia during the third round of the Sony Ericsson Open at the Crandon Park Tennis...

Dinara Safina, from Russia, celebrates a point during her match against Samantha Stosur at the Sony Ericsson Open tennis tournament in Key Biscayne, Fla., Sunday, March 29, 2009