Russia's President Dmitry Medvedev (L) decorates Russian tennis player Elena Dementieva with the Order for Services to the Fatherland, fourth grade, during an award ceremony in the Kremlin, in Moscow, December 30, 2010. REUTERS/Alexander Natruskin (RUSSIA - Tags: POLITICS SPORT TENNIS) 

Elena Dementieva of Russia returns the ball to Francesca Schiavone of Italy during their WTA Tour Championships tennis match in Doha October 29, 2010. REUTERS/Fadi Al-Assaad (QATAR - Tags: SPORT TENNIS) 

Elena Dementieva of Russia receives a gift from President of the Qatar Tennis Federation Nasser Al Khelaifi after announcing her retirement at the WTA Tour Championships in Doha October 29, 2010. REUTERS/stringer (QATAR - Tags: SPORT TENNIS) 

Elena Dementieva of Russia (L) kisses compatriot Vera Zvonareva after announcing her retirement at the WTA Tour Championships tennis match in Doha October 29, 2010. REUTERS/Stringer (QATAR - Tags: SPORT TENNIS) 

Elena Dementieva of Russia (7th L) poses with players, her mother Vera Dementieva (4th R) and WTA CEO Stacey Allaster (2nd R) at a ceremony to announce her retirement after her match against Francesca Schiavone of Italy at the WTA Tour Championships tennis match in Doha October 29, 2010. REUTERS/Stringer (QATAR - Tags: SPORT TENNIS) 

Elena Dementieva of Russia (R) speaks after receiving a gift from President of the Qatar Tennis Federation Nasser Al Khelaifi (L) after announcing her retirement at the WTA Tour Championships in Doha October 29, 2010. REUTERS/Stringer (QATAR - Tags: SPORT TENNIS) 

Elena Dementieva of Russia reacts after losing a point against Francesca Schiavone of Italy during their WTA Tour Championships tennis match in Doha October 29, 2010. REUTERS/Fadi Al-Assaad (QATAR - Tags: SPORT TENNIS) 

Samantha Stosur of Australia (L) stands beside Elena Dementieva of Russia as she hugs her mother Vera after announcing her retirement at the WTA Tour Championships in Doha October 29, 2010. Dementieva, who won gold at the 2008 Olympic Games, announced her retirement from tennis at the WTA Championships on Thursday. REUTERS/Stringer (QATAR - Tags: SPORT TENNIS) 

Elena Dementieva of Russia speaks after announcing her retirement at the WTA Tour Championships in Doha October 29, 2010. Dementieva, who won gold at the 2008 Olympic Games, announced her retirement from tennis at the WTA Championships on Thursday. REUTERS/Stringer (QATAR - Tags: SPORT TENNIS) 

Elena Dementieva of Russia is embraced by her mother Vera after announcing her retirement following her WTA Tour Championships tennis match against Francesca Schiavone of Italy in Doha October 29, 2010. Dementieva, who won gold at the 2008 Olympic Games, announced her retirement from tennis at the WTA Championships on Thursday. REUTERS/Stringer (QATAR - Tags: SPORT TENNIS) 

Elena Dementieva of Russia announces her retirement after her WTA Tour Championships tennis match against Francesca Schiavone of Italy in Doha October 29, 2010. Dementieva, who won gold at the 2008 Olympic Games, announced her retirement from tennis at the WTA Championships on Thursday. REUTERS/stringer (QATAR - Tags: SPORT TENNIS) 

Caroline Wozniacki of Denmark watches the match between Francesca Schiavone of Italy and Elena Dementieva of Russia during the WTA Tour Championships in Doha October 29, 2010. REUTERS/Fadi Al-Assaad (QATAR - Tags: SPORT TENNIS) 

Elena Dementieva of Russia returns the ball to Francesca Schiavone of Italy during their WTA Tour Championships tennis match in Doha October 29, 2010. REUTERS/Fadi Al-Assaad (QATAR - Tags: SPORT TENNIS) 

Francesca Schiavone of Italy reacts after losing a point against Elena Dementieva of Russia during their WTA Tour Championships tennis match in Doha October 29, 2010. REUTERS/Fadi Al-Assaad (QATAR - Tags: SPORT TENNIS) 

Caroline Wozniacki of Denmark (L) sits next to her father Piotr Wozniacki (C) and mother Anna as they watch the WTA Tour Championships tennis match between Francesca Schiavone of Italy and Elena Dementieva of Russia in Doha October 29, 2010. REUTERS/Fadi Al-Assaad (QATAR - Tags: SPORT TENNIS) 

Caroline Wozniacki of Denmark (L) sits next to her father Piotr Wozniacki (2nd L) and mother Anna (3rd L) as they watch the WTA Tour Championships tennis match between Francesca Schiavone of Italy and Elena Dementieva of Russia in Doha October 29, 2010. REUTERS/Fadi Al-Assaad (QATAR - Tags: SPORT TENNIS) 

Elena Dementieva of Russia reacts after losing a point against Francesca Schiavone of Italy during their WTA Tour Championships tennis match in Doha October 29, 2010. REUTERS/Fadi Al-Assaad (QATAR - Tags: SPORT TENNIS) 

Elena Dementieva of Russia reacts after losing a point against Francesca Schiavone of Italy during their WTA Tour Championships tennis match in Doha October 29, 2010. REUTERS/Fadi Al-Assaad (QATAR - Tags: SPORT TENNIS IMAGES OF THE DAY) 

Elena Dementieva of Russia returns the ball to Francesca Schiavone of Italy during their WTA Tour Championships tennis match in Doha October 29, 2010. REUTERS/Fadi Al-Assaad (QATAR - Tags: SPORT TENNIS) 

Elena Dementieva of Russia serves to Francesca Schiavone of Italy during their WTA Tour Championships tennis match in Doha October 29, 2010. REUTERS/Fadi Al-Assaad (QATAR - Tags: SPORT TENNIS) 

Francesca Schiavone of Italy returns the ball to Elena Dementieva of Russia during their WTA Tour Championships tennis match in Doha October 29, 2010. REUTERS/Fadi Al-Assaad (QATAR - Tags: SPORT TENNIS) 

Elena Dementieva of Russia returns a shot to Francesca Schiavone of Italy during their WTA Tour Championships tennis match in Doha October 29, 2010. REUTERS/Fadi Al-Assaad (QATAR - Tags: SPORT TENNIS) 

Elena Dementieva of Russia serves to Francesca Schiavone of Italy during their WTA Tour Championships tennis match in Doha October 29, 2010. REUTERS/Fadi Al-Assaad (QATAR - Tags: SPORT TENNIS) 

Elena Dementieva of Russia serves to Francesca Schiavone of Italy during their WTA Tour Championships tennis match in Doha October 29, 2010. REUTERS/Fadi Al-Assaad (QATAR - Tags: SPORT TENNIS) 

Francesca Schiavone of Italy serves to Elena Dementieva of Russia during their WTA Tour Championships tennis match in Doha October 29, 2010. REUTERS/Fadi Al-Assaad (QATAR - Tags: SPORT TENNIS) 

Elena Dementieva of Russia reacts after losing a point Samantha Stosur of Australia during their WTA Tour Championships tennis match in Doha October 28, 2010. REUTERS/Fadi Al-Assaad (QATAR - Tags: SPORT TENNIS) 

Elena Dementieva of Russia reacts after losing a point to Samantha Stosur of Australia during their WTA Tour Championships tennis match in Doha October 28, 2010. REUTERS/Fadi Al-Assaad (QATAR - Tags: SPORT TENNIS) 

Elena Dementieva of Russia reacts to her win over Samantha Stosur of Australia in their WTA Tour Championships tennis match in Doha October 28, 2010. REUTERS/Fadi Al-Assaad (QATAR - Tags: SPORT TENNIS) 

Elena Dementieva of Russia reacts to her win over Samantha Stosur of Australia during their WTA Tour Championships tennis match in Doha October 28, 2010. REUTERS/Fadi Al-Assaad (QATAR - Tags: SPORT TENNIS) 

Elena Dementieva of Russia reacts after winning a point against Samantha Stosur of Australia during their WTA Tour Championships tennis match in Doha October 28, 2010. REUTERS/Fadi Al-Assaad (QATAR - Tags: SPORT TENNIS) 

Elena Dementieva of Russia returns the ball to Samantha Stosur of Australia during their WTA Tour Championships tennis match in Doha October 28, 2010. REUTERS/Fadi Al-Assaad (QATAR - Tags: SPORT TENNIS) 

Samantha Stosur of Australia reacts after losing a point Elena Dementieva of Russia during their WTA Tour Championships tennis match in Doha October 28, 2010. REUTERS/Fadi Al-Assaad (QATAR - Tags: SPORT TENNIS) 

Elena Dementieva of Russia returns the ball to Samantha Stosur of Australia during their WTA Tour Championships tennis match in Doha October 28, 2010. REUTERS/Fadi Al-Assaad (QATAR - Tags: SPORT TENNIS) 

Samantha Stosur of Australia returns the ball to Elena Dementieva of Russia during their WTA Tour Championships tennis match in Doha October 28, 2010. REUTERS/Fadi Al-Assaad (QATAR - Tags: SPORT TENNIS) 

Samantha Stosur of Australia returns the ball to Elena Dementieva of Russia during their WTA Tour Championships tennis match in Doha October 28, 2010. REUTERS/Fadi Al-Assaad (QATAR - Tags: SPORT TENNIS) 

Elena Dementieva of Russia returns the ball to Samantha Stosur of Australia during their WTA Tour Championships tennis match in Doha October 28, 2010. REUTERS/Fadi Al-Assaad (QATAR - Tags: SPORT TENNIS) 

Elena Dementieva of Russia returns the ball to Samantha Stosur of Australia during their WTA Tour Championships tennis match in Doha October 28, 2010. REUTERS/Fadi Al-Assaad (QATAR - Tags: SPORT TENNIS) 

Samantha Stosur of Australia returns the ball to Elena Dementieva of Russia during their WTA Tour Championships tennis match in Doha October 28, 2010. REUTERS/Fadi Al-Assaad (QATAR - Tags: SPORT TENNIS) 

Elena Dementieva of Russia returns the ball to Samantha Stosur of Australia during their WTA Tour Championships tennis match in Doha October 28, 2010. REUTERS/Fadi Al-Assaad (QATAR - Tags: SPORT TENNIS) 

Elena Dementieva of Russia returns the ball to Samantha Stosur of Australia during their WTA Tour Championships tennis match in Doha October 28, 2010. REUTERS/Fadi Al-Assaad (QATAR - Tags: SPORT TENNIS) 

Samantha Stosur of Australia returns the ball to Elena Dementieva of Russia during their WTA Tour Championships tennis match in Doha October 28, 2010. REUTERS/Fadi Al-Assaad (QATAR - Tags: SPORT TENNIS) 

Samantha Stosur of Australia serves to Elena Dementieva of Russia during their WTA Tour Championships tennis match in Doha October 28, 2010. REUTERS/Fadi Al-Assaad (QATAR - Tags: SPORT TENNIS) 

Samantha Stosur of Australia serves to Elena Dementieva of Russia during their WTA Tour Championships tennis match in Doha October 28, 2010. REUTERS/Fadi Al-Assaad (QATAR - Tags: SPORT TENNIS) 

Elena Dementieva of Russia serves to Samantha Stosur of Australia during their WTA Tour Championships tennis match in Doha October 28, 2010. REUTERS/Fadi Al-Assaad (QATAR - Tags: SPORT TENNIS) 

Elena Dementieva of Russia serves to Samantha Stosur of Australia during their WTA Tour Championships tennis match in Doha October 28, 2010. REUTERS/Fadi Al-Assaad (QATAR - Tags: SPORT TENNIS) 

Elena Dementieva of Russia returns the ball to Samantha Stosur of Australia during their WTA Tour Championships tennis match in Doha October 28, 2010. REUTERS/Fadi Al-Assaad (QATAR - Tags: SPORT TENNIS) 

Elena Dementieva of Russia serves to Samantha Stosur of Australia during their WTA Tour Championships tennis match in Doha October 28, 2010. REUTERS/Fadi Al-Assaad (QATAR - Tags: SPORT TENNIS) 

Samantha Stosur of Australia serves to Elena Dementieva of Russia during their WTA Tour Championships tennis match in Doha October 28, 2010. REUTERS/Fadi Al-Assaad (QATAR - Tags: SPORT TENNIS) 

Caroline Wozniacki of Denmark reacts to her win over Elena Dementieva of Russia during their WTA Tour Championships tennis match in Doha October 26, 2010. REUTERS/Fadi Al-Assaad (QATAR - Tags: SPORT TENNIS) 

Caroline Wozniacki of Denmark serves 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 reacts to her win over 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 reacts to her win over 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) 

Caroline Wozniacki of Denmark serves 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) 

Caroline Wozniacki of Denmark serves 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) 

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)