Venus Williams of the United States hits a return to Svetlana Kznetsova of Russia during their match at the Sony Ericsson Championships at the International Khalifa Tennis Complex Doha, Qatar on 29 October 2009 . EPA/STRINGER
Serbia's Jelena Jankovic reacts to her win over Caroline Wozniacki of Denmark during their match for the Sony Ericsson Championships at the International Khalifa Tennis Complex Doha, Qatar, 30 October 2009. EPA/STRINGER
Serbia's Jelena Jankovic reacts to her win over Caroline Wozniacki of Denmark during their match for the Sony Ericsson Championships at the International Khalifa Tennis Complex Doha, Qatar, 30 October 2009. EPA/STRINGER
Svetlana Kznetsova of Russia hits a return to Venus Williams of the US during their match at the Sony Ericsson Championships at the International Khalifa Tennis Complex Doha, Qatar on 29 October 2009 . EPA/STRINGER
Svetlana Kznetsova of Russia serves to Venus Williams of the US during their match at the Sony Ericsson Championships at the International Khalifa Tennis Complex Doha, Qatar on 29 October 2009. EPA/STRINGER
Svetlana Kznetsova of Russia hits a return to Venus Williams of the US during their match at the Sony Ericsson Championships at the International Khalifa Tennis Complex Doha, Qatar on 29 October 2009 . EPA/STRINGER
Serena Williams of USA strteches for a ball during her match against Elena Dementieva of Russia on the third day of the Sony Ericsson Championships at the International Khalifa Tennis Complex Doha, Qatar on 29 October 2009 . EPA/STRINGER
Venus Williams of the United States reacts upon winning her match against Svetlana Kznetsova of Russia at the Sony Ericsson Championships at the International Khalifa Tennis Complex Doha, Qatar on 29 October 2009 . EPA/STRINGER
Venus Williams of the United States reacts upon winning her match against Svetlana Kznetsova of Russia at the Sony Ericsson Championships at the International Khalifa Tennis Complex Doha, Qatar on 29 October 2009 . EPA/STRINGER
Serena Williams of the United States reacts upon winning her singles match against Elena Dementieva of Russia at the the Sony Ericsson Championships at the International Khalifa Tennis Complex Doha, Qatar on 29 October 2009 . EPA/STRINGER
Serena Williams of USA strteches for a ball during her match against Elena Dementieva of Russia on the third day of the Sony Ericsson Championships at the International Khalifa Tennis Complex Doha, Qatar on 29 October 2009 . EPA/STRINGER
Serena Williams of USA serves the ball to Elena Dementieva of Russia during their match on the third day of the Sony Ericsson Championships at the International Khalifa Tennis Complex Doha, Qatar on 29 October 2009 . EPA/STRINGER
Serena Williams of USA hits a return to Elena Dementieva of Russia during their match on the third day of the Sony Ericsson Championships at the International Khalifa Tennis Complex Doha, Qatar on 29 October 2009 . EPA/STRINGER
Elena Dementieva of Russia hits a return to Serena Williams of USA during their match on the third day of the Sony Ericsson Championships at the International Khalifa Tennis Complex Doha, Qatar on 29 October 2009 . EPA/STRINGER
Caroline Wozniacki of Denmark returns to Vera Zvonareva of Russia during their match on the third day of the Sony Ericsson Championships at the International Khalifa Tennis Complex Doha, Qatar on 29 October 2009. EPA/STRINGER
Caroline Wozniacki of Denmark reacts after winning her match against Vera Zvonareva of Russia on the third day of the Sony Ericsson Championships at the International Khalifa Tennis Complex Doha, Qatar on 29 October 2009. EPA/STRINGER
Caroline Wozniacki of Denmark falls to the floor suffering from cramp during her singles match against Vera Zvonareva of Russia on the third day of the Sony Ericsson Championships at the International Khalifa Tennis Complex Doha, Qatar on 29 October 2009. EPA/STRINGER
Caroline Wozniacki of Denmark stretches for a ball during her match against Vera Zvonareva of Russia on the third day of the Sony Ericsson Championships at the International Khalifa Tennis Complex Doha, Qatar on 29 October 2009. EPA/STRINGER
Caroline Wozniacki of Denmark returns to Vera Zvonareva of Russia during their match on the third day of the Sony Ericsson Championships at the International Khalifa Tennis Complex Doha, Qatar on 29 October 2009. EPA/STRINGER
Vera Zvonareva of Russia returns to Caroline Wozniacki of Denmark during their match on the third day of the Sony Ericsson Championships at the International Khalifa Tennis Complex Doha, Qatar on 29 October 2009. EPA/STRINGER
A general view of the match of Caroline Wozniacki of Denmark against Vera Zvonareva of Russia on the third day of the Sony Ericsson Championships at the International Khalifa Tennis Complex Doha, Qatar on 29 October 2009. EPA/STRINGER
Caroline Wozniacki of Denmark returns to Vera Zvonareva of Russia during their match on the second day of the Sony Ericsson Championships at the International Khalifa Tennis Complex Doha, Qatar on 29 October 2009. EPA/STRINGER
Caroline Wozniacki of Denmark returns to Vera Zvonareva of Russia during their match on the second day of the Sony Ericsson Championships at the International Khalifa Tennis Complex Doha, Qatar on 29 October 2009. EPA/STRINGER