Images from Day 2 of the WTA Finals
Caroline Wozniacki and Maria Sharapova in action at season-ending tournament
Caroline Wozniacki of Denmark walks out on court before her match against Maria Sharapova of Russia during day two of the BNP Paribas WTA Finals tennis at the Singapore Sports Hub on October 21, 2014 in Singapore.Julian Finney/Getty Images
Maria Sharapova of Russia walks out on court before her match against Caroline Wozniacki of Denmark during day two of the BNP Paribas WTA Finals tennis at the Singapore Sports Hub on October 21, 2014 in Singapore.Julian Finney/Getty Images
Maria Sharapova makes a forehand return to Caroline Wozniacki during their singles match at the WTA tennis finals in SingaporeMark Baker/The Associated Press
Maria Sharapova in action against Caroline Wozniacki during day two of the BNP Paribas WTA Finals tennis at the Singapore Sports Hub.Julian Finney/Getty Images
Caroline Wozniacki plays a shot against Maria Sharapova during their WTA Finals singles tennis match at the Singapore Indoor Stadium October 21, 2014.EDGAR SU/Reuters
Maria Sharapova hits the ball against Caroline Wozniackiduring the Women's Tennis Association (WTA) finals in Singapore on October 21, 2014.ROSLAN RAHMAN/AFP / Getty Images
Caroline Wozniacki serves against Maria Sharapova during their WTA Finals singles tennis match at the Singapore Indoor Stadium.EDGAR SU/Reuters
Caroline Wozniacki of Denmark in action against Maria Sharapova of Russia during day two of the BNP Paribas WTA Finals tennis.Julian Finney/Getty Images
Maria Sharapova of Russia serves against Caroline Wozniacki of Denmark in their round robin match during the BNP Paribas WTA Finals at Singapore Sports Hub on October 21, 2014 in Singapore.Clive Brunskill/Getty Images
Maria Sharapova serves against Caroline Wozniacki in their round robin match during the BNP Paribas WTA Finals at Singapore Sports Hub on October 21, 2014.Clive Brunskill/Getty Images
Russia's Maria Sharapova serves to Denmark's Caroline Wozniacki during their singles match at the WTA tennis finals in Singapore,Tuesday, Oct. 21, 2014.Mark Baker/The Associated Press
Maria Sharapova of Russia serves against Caroline Wozniacki of Denmark during their WTA Finals singles tennis match at the Singapore Indoor Stadium October 21, 2014.EDGAR SU/Reuters
Maria Sharapova celebrates winning the second set against Caroline Wozniacki in their round robin match during the BNP Paribas WTA Finals at Singapore Sports Hub.Clive Brunskill/Getty Images
Caroline Wozniacki of Denmark challenges a call during her WTA Finals singles tennis match against Maria Sharapova of Russia at the Singapore Indoor Stadium October 21, 2014.EDGAR SU/Reuters
Caroline Wozniacki shows her emotions after a bad line call against Maria Sharapova in their round robin match during the BNP Paribas WTA Finals at Singapore Sports Hub on October 21, 2014 in Singapore.Clive Brunskill/Getty Images
Caroline Wozniacki shakes hands at the net after her three set victory against Maria Sharapova.Clive Brunskill/Getty Images
Petra Kvitova of Czech Republic serves a shot against Agnieszka Radwanska of Poland during the Women's Tennis Association (WTA) finals in Singapore on October 21, 2014.ROSLAN RAHMAN/AFP / Getty Images
Agnieszka Radwanska of Poland in action in her match against Petra Kvitova of Czech Republic during day two of the BNP Paribas WTA Finals tennis at the Singapore Sports Hub in Singapore.Julian Finney/Getty Images
Agnieszka Radwanska serves to Petra Kvitova during their WTA Finals singles tennis match at the Singapore Indoor Stadium.EDGAR SU/Reuters
Petra Kvitova hits a return to Agnieszka Radwanska during their WTA Finals singles tennis match at the Singapore Indoor Stadium October 21, 2014.EDGAR SU/Reuters
Agnieszka Radwanska is congratulated by Petra Kvitova during their WTA Finals singles tennis match at the Singapore Indoor Stadium October 22, 2014.EDGAR SU/Reuters