Caroline Wozniacki of Denmark returns the ball to Elena Dementieva of Russia during their WTA Tour Championships tennis match in Doha October 26, 2010.The tournament will take place in Doha from October 26 to 31 . REUTERS/Fadi Al-Assaad (QATAR - Tags: SPORT TENNIS) 

Elena Dementieva of Russia returns the ball to Caroline Wozniacki of Denmark during their WTA Tour Championships tennis match in Doha October 26, 2010. The tournament will take place in Doha from October 26 to 31. REUTERS/Fadi Al-Assaad (QATAR - Tags: SPORT TENNIS) 

Caroline Wozniacki of Denmark returns the ball to Elena Dementieva of Russia during their WTA Tour Championships tennis match in Doha October 26, 2010.The tournament will take place in Doha from October 26 to 31 . REUTERS/Fadi Al-Assaad (QATAR - Tags: SPORT TENNIS) 

Caroline Wozniacki of Denmark returns the ball to Elena Dementieva of Russia during their WTA Tour Championships tennis match in Doha October 26, 2010.The tournament will take place in Doha from October 26 to 31. REUTERS/Fadi Al-Assaad (QATAR - Tags: SPORT TENNIS) 

Tennis players Francesca Schiavone of Italy, Kim Clijsters of Belgium, Vera Zvonareva of Russia, Caroline Wozniacki of Denmark, Jelena Jankovic of Serbia, Elena Dementieva of Russia and Samantha Stosur of Australia (L-R) pose for a picture during the draw for the WTA Tour Championships in Doha October 24, 2010. The tournament will take place in Doha from 26 to 31 October. REUTERS/Fadi Al-Assaad (QATAR - Tags: SPORT TENNIS) 

Tennis players Caroline Wozniacki of Denmark, Vera Zvonareva of Russia, Kim Clijsters of Belgium, Francesca Schiavone of Italy, Samantha Stosur of Australia, Jelena Jankovic of Serbia and Elena Dementieva of Russia (L-R) pose for a picture during the draw for the WTA Tour Championships in Doha October 24, 2010. The tournament will take place in Doha from October 26 to 31. REUTERS/Fadi Al-Assaad (QATAR - Tags: SPORT TENNIS) 

Tennis players Caroline Wozniacki of Denmark, Vera Zvonareva of Russia, Kim Clijsters of Belgium, Francesca Schiavone of Italy, Samantha Stosur of Australia, Jelena Jankovic of Serbia and Elena Dementieva of Russia (L-R) pose for a picture during the draw for the WTA Tour Championships in Doha October 24, 2010. The tournament will take place in Doha from 26 to 31 October. REUTERS/Fadi Al-Assaad (QATAR - Tags: SPORT TENNIS) 

Tennis player Elena Dementieva of Russia attends the draw for the WTA Tour Championships in Doha October 24, 2010. The tournament will take place in Doha from 26 to 31 October. REUTERS/Fadi Al-Assaad (QATAR - Tags: SPORT TENNIS) 

Caroline Wozniacki of Denmark greets fans after defeating Elena Dementieva of Russia during the Pan Pacific Open tennis tournament in Tokyo October 2, 2010. REUTERS/Kim Kyung-Hoon (JAPAN - Tags: SPORT TENNIS) 

Elena Dementieva of Russia returns the ball to Caroline Wozniacki of Denmark during their final match at the Pan Pacific Open tennis tournament in Tokyo October 2, 2010. REUTERS/Kim Kyung-Hoon (JAPAN - Tags: SPORT TENNIS) 

Elena Dementieva of Russia reacts after losing a point to Caroline Wozniacki of Denmark during their final match at the Pan Pacific Open tennis tournament in Tokyo October 2, 2010. REUTERS/Kim Kyung-Hoon (JAPAN - Tags: SPORT TENNIS) 

Elena Dementieva of Russia reacts after losing a point to Caroline Wozniacki of Denmark during their final match at the Pan Pacific Open tennis tournament in Tokyo October 2, 2010. REUTERS/Kim Kyung-Hoon (JAPAN - Tags: SPORT TENNIS IMAGES OF THE DAY) 

Caroline Wozniacki of Denmark returns the ball to Elena Dementieva of Russia during the Pan Pacific Open tennis tournament in Tokyo October 2, 2010. REUTERS/Kim Kyung-Hoon (JAPAN - Tags: SPORT TENNIS HEADSHOT) 

Caroline Wozniacki of Denmark returns the ball to Elena Dementieva of Russia during the Pan Pacific Open tennis tournament in Tokyo October 2, 2010. REUTERS/Kim Kyung-Hoon (JAPAN - Tags: SPORT TENNIS) 

Winner Caroline Wozniacki of Denmark (R) and second-placed Elena Dementieva of Russia pose with their trophies at the Pan Pacific Open tennis tournament in Tokyo October 2, 2010. REUTERS/Kim Kyung-Hoon (JAPAN - Tags: SPORT TENNIS) 

Caroline Wozniacki of Denmark reacts after winning a point against Elena Dementieva of Russia during their final match at the Pan Pacific Open tennis tournament in Tokyo October 2, 2010. REUTERS/Kim Kyung-Hoon (JAPAN - Tags: SPORT TENNIS) 

Caroline Wozniacki of Denmark poses with her victory trophy after defeating Elena Dementieva of Russia at the Pan Pacific Open tennis tournament in Tokyo October 2, 2010. REUTERS/Kim Kyung-Hoon (JAPAN - Tags: SPORT TENNIS) 

Caroline Wozniacki of Denmark reacts after winning a point against Elena Dementieva of Russia during the Pan Pacific Open tennis tournament in Tokyo October 2, 2010. REUTERS/Kim Kyung-Hoon (JAPAN - Tags: SPORT TENNIS) 

Elena Dementieva of Russia returns the ball to Francesca Schiavone of Italy during their semi-final match at the Pan Pacific Open tennis tournament in Tokyo October 1, 2010. REUTERS/Kim Kyung-Hoon (JAPAN - Tags: SPORT TENNIS) 

Francesca Schiavone of Italy returns to the ball to Elena Dementieva of Russia during their semi-final match at the Pan Pacific Open tennis tournament in Tokyo October 1, 2010. REUTERS/Kim Kyung-Hoon (JAPAN - Tags: SPORT TENNIS) 

Elena Dementieva of Russia reacts after winning a point against Francesca Schiavone of Italy during their semi-final match at the Pan Pacific Open tennis tournament in Tokyo October 1, 2010. REUTERS/Kim Kyung-Hoon (JAPAN - Tags: SPORT TENNIS) 

Elena Dementieva of Russia returns the ball to Francesca Schiavone of Italy during their semi-final match at the Pan Pacific Open tennis tournament in Tokyo October 1, 2010. REUTERS/Kim Kyung-Hoon (JAPAN - Tags: SPORT TENNIS) 

Vera Zvonareva of Russia returns the ball to her compatriot Elena Dementieva in the quarter-final of the Pan Pacific Open tennis tournament in Tokyo September 30, 2010. REUTERS/Kim Kyung-Hoon (JAPAN - Tags: SPORT TENNIS) 

Vera Zvonareva of Russia returns the ball to her compatriot Elena Dementieva at the quarter-finals of the Pan Pacific Open tennis tournament in Tokyo September 30, 2010. REUTERS/Kim Kyung-Hoon (JAPAN - Tags: SPORT TENNIS) 

Elena Dementieva of Russia reacts after defeating her compatriot Vera Zvonareva at the quarter-finals of the Pan Pacific Open tennis tournament in Tokyo September 30, 2010. REUTERS/Kim Kyung-Hoon (JAPAN - Tags: SPORT TENNIS) 

Elena Dementieva of Russia returns the ball to her compatriot Vera Zvonareva at the quarter-finals of the Pan Pacific Open tennis tournament in Tokyo September 30, 2010. REUTERS/Kim Kyung-Hoon (JAPAN - Tags: SPORT TENNIS) 

Elena Dementieva of Russia returns the ball to her compatriot Vera Zvonareva at the quarter-finals of the Pan Pacific Open tennis tournament in Tokyo September 30, 2010. REUTERS/Kim Kyung-Hoon (JAPAN - Tags: SPORT TENNIS) 

Flavia Pennetta of Italy returns the ball to Elena Dementieva of Russia during the Pan Pacific Open tennis tournament in Tokyo September 29, 2010. REUTERS/Kim Kyung-Hoon (JAPAN - Tags: SPORT TENNIS) 

Elena Dementieva of Russia serves the ball to Flavia Pennetta of Italy during the Pan Pacific Open tennis tournament in Tokyo September 29, 2010. REUTERS/Kim Kyung-Hoon (JAPAN - Tags: SPORT TENNIS) 

Elena Dementieva of Russia returns the ball to Flavia Pennetta of Italy during the Pan Pacific Open tennis tournament in Tokyo September 29, 2010. REUTERS/Kim Kyung-Hoon (JAPAN - Tags: SPORT TENNIS) 

Yaroslava Shvedova of Kazakhstan returns the ball to Elena Dementieva of Russia during the Pan Pacific Open tennis tournament in Tokyo September 28, 2010. REUTERS/Toru Hanai (JAPAN - Tags: SPORT TENNIS) 

Yaroslava Shvedova of Kazakhstan returns the ball to Elena Dementieva of Russia during the Pan Pacific Open tennis tournament in Tokyo September 28, 2010. REUTERS/Toru Hanai (JAPAN - Tags: SPORT TENNIS) 

Elena Dementieva of Russia returns the ball to Yaroslava Shvedova of Kazakhstan during the Pan Pacific Open tennis tournament in Tokyo September 28, 2010. REUTERS/Toru Hanai (JAPAN - Tags: SPORT TENNIS) 

Elena Dementieva of Russia returns the ball to Yaroslava Shvedova of Kazakhstan during the Pan Pacific Open tennis tournament in Tokyo September 28, 2010. REUTERS/Toru Hanai (JAPAN - Tags: SPORT TENNIS) 

Elena Dementieva of Russia returns the ball to Yaroslava Shvedova of Kazakhstan during the Pan Pacific Open tennis tournament in Tokyo September 28, 2010. REUTERS/Toru Hanai (JAPAN - Tags: SPORT TENNIS) 

Elena Dementieva of Russia returns the ball to Yaroslava Shvedova of Kazakhstan during the Pan Pacific Open tennis tournament in Tokyo September 28, 2010. REUTERS/Toru Hanai (JAPAN - Tags: SPORT TENNIS) 

Elena Dementieva of Russia hits a return to Samantha Stosur of Australia during the U.S. Open tennis tournament in New York, September 5, 2010. REUTERS/Kena Betancur (UNITED STATES - Tags: SPORT TENNIS) 

Samantha Stosur of Australia celebrates defeating Elena Dementieva of Russia at the U.S. Open tennis tournament in New York, September 5, 2010. REUTERS/Kena Betancur (UNITED STATES - Tags: SPORT TENNIS) 

Samantha Stosur of Australia celebrates defeating Elena Dementieva of Russia at the U.S. Open tennis tournament in New York, September 5, 2010. REUTERS/Eduardo Munoz (UNITED STATES - Tags: SPORT TENNIS) 

Samantha Stosur of Australia celebrates defeating Elena Dementieva of Russia at the U.S. Open tennis tournament in New York, September 5, 2010. REUTERS/Eduardo Munoz (UNITED STATES - Tags: SPORT TENNIS) 

Samantha Stosur of Australia celebrates defeating Elena Dementieva of Russia at the U.S. Open tennis tournament in New York, September 5, 2010. REUTERS/Eduardo Munoz (UNITED STATES - Tags: SPORT TENNIS) 

Samantha Stosur of Australia hits a return to Elena Dementieva of Russia at the U.S. Open tennis tournament in New York, September 5, 2010. REUTERS/Eduardo Munoz (UNITED STATES - Tags: SPORT TENNIS) 

Elena Dementieva of Russia reacts after missing a shot to Samantha Stosur of Australia during the U.S. Open tennis tournament in New York, September 5, 2010. REUTERS/Eduardo Munoz (UNITED STATES - Tags: SPORT TENNIS) 

Elena Dementieva of Russia reacts after missing a shot to Samantha Stosur of Australia during the U.S. Open tennis tournament in New York, September 5, 2010. REUTERS/Eduardo Munoz (UNITED STATES - Tags: SPORT TENNIS) 

Elena Dementieva of Russia celebrates breaking the serve of Samantha Stosur of Australia during the U.S. Open tennis tournament in New York September 5, 2010. REUTERS/Eduardo Munoz (UNITED STATES - Tags: SPORT TENNIS IMAGES OF THE DAY) 

Samantha Stosur of Australia wipes her eyes during her match against Elena Dementieva of Russia at the U.S. Open tennis tournament in New York September 5, 2010. REUTERS/Eduardo Munoz (UNITED STATES - Tags: SPORT TENNIS) 

Samantha Stosur of Australia towels off during her match against Elena Dementieva of Russia at the U.S. Open tennis tournament in New York, September 5, 2010. REUTERS/Eduardo Munoz (UNITED STATES - Tags: SPORT TENNIS) 

Samantha Stosur of Australia towels off during her match against Elena Dementieva of Russia at the U.S. Open tennis tournament in New York, September 5, 2010. REUTERS/Eduardo Munoz (UNITED STATES - Tags: SPORT TENNIS) 

Samantha Stosur of Australia reacts to winning a point during her match against Elena Dementieva of Russia at the U.S. Open tennis tournament in New York September 5, 2010. REUTERS/Eduardo Munoz (UNITED STATES - Tags: SPORT TENNIS) 

Elena Dementieva of Russia hits a return to Samantha Stosur of Australia during the U.S. Open tennis tournament in New York, September 5, 2010. REUTERS/Eduardo Munoz (UNITED STATES - Tags: SPORT TENNIS) 

Elena Dementieva of Russia hits a return to Samantha Stosur of Australia during the U.S. Open tennis tournament in New York, September 5, 2010. REUTERS/Eduardo Munoz (UNITED STATES - Tags: SPORT TENNIS) 

Elena Dementieva of Russia reacts to her shot as she plays Samantha Stosur of Australia during the U.S. Open tennis tournament in New York September 5, 2010. REUTERS/Eduardo Munoz (UNITED STATES - Tags: SPORT TENNIS) 

Elena Dementieva of Russia serves to Samantha Stosur of Australia during the U.S. Open tennis tournament in New York, September 5, 2010. REUTERS/Eduardo Munoz (UNITED STATES - Tags: SPORT TENNIS) 

Samantha Stosur of Australia reacts in the second set during her match to Elena Dementieva of Russia at the U.S. Open tennis tournament in New York, September 5, 2010. REUTERS/Eduardo Munoz (UNITED STATES - Tags: SPORT TENNIS) 

Elena Dementieva of Russia runs to hit a return to Samantha Stosur of Australia during the U.S. Open tennis tournament in New York, September 5, 2010. REUTERS/Eduardo Munoz (UNITED STATES - Tags: SPORT TENNIS) 

Samantha Stosur of Australia serves to Elena Dementieva of Russia during the U.S. Open tennis tournament in New York, September 5, 2010. REUTERS/Kena Betancur (UNITED STATES - Tags: SPORT TENNIS) 

Samantha Stosur of Australia reacts after winning a point against Elena Dementieva of Russia during the U.S. Open tennis tournament in New York, September 5, 2010. REUTERS/Eduardo Munoz (UNITED STATES - Tags: SPORT TENNIS) 

Samantha Stosur of Australia serves to Elena Dementieva of Russia during the U.S. Open tennis tournament in New York, September 5, 2010. REUTERS/Eduardo Munoz (UNITED STATES - Tags: SPORT TENNIS) 

Samantha Stosur of Australia hits a return to Elena Dementieva of Russia during the U.S. Open tennis tournament in New York, September 5, 2010. REUTERS/Eduardo Munoz (UNITED STATES - Tags: SPORT TENNIS) 

Samantha Stosur of Australia hits a return to Elena Dementieva of Russia during the U.S. Open tennis tournament in New York, September 5, 2010. REUTERS/Eduardo Munoz (UNITED STATES - Tags: SPORT TENNIS)