Ana Ivanovic (Serbia) competes in the red group match against Simona Halep (Romania) during the Women's Tennis Association (WTA) finals.

24.10.2014#2516746

Ana Ivanovic (Serbia) competes in the red group match against Simona Halep (Romania) during the Women's Tennis Association (WTA) finals.

24.10.2014#2516745

Ana Ivanovic (Serbia) competes in the red group match against Simona Halep (Romania) during the Women's Tennis Association (WTA) finals.

24.10.2014#2516730

Simona Halep (Romania) competes in the red group match against Ana Ivanovic (Serbia) during the Women's Tennis Association (WTA) finals.

24.10.2014#2516729

Simona Halep (Romania) competes in the red group match against Ana Ivanovic (Serbia) during the Women's Tennis Association (WTA) finals.

24.10.2014#2516727

Simona Halep (Romania) competes in the red group match against Ana Ivanovic (Serbia) during the Women's Tennis Association (WTA) finals.

24.10.2014#2516726

Ana Ivanovic (Serbia) competes in the red group match against Simona Halep (Romania) during the Women's Tennis Association (WTA) finals.

24.10.2014#2516725

Spectators at the red group match between Simona Halep (Romania) and Ana Ivanovic (Serbia) during the Women's Tennis Association (WTA) finals.

24.10.2014#2516711

Simona Halep (Romania) competes in the red group match against Ana Ivanovic (Serbia) during the Women's Tennis Association (WTA) finals.

24.10.2014#2516710

Simona Halep (Romania), right, congratulates Ana Ivanovic (Serbia) for winning the red group match during the Women's Tennis Association (WTA) finals in Singapore.

24.10.2014#2516709

Ana Ivanovic (Serbia) competes in the red group match against Simona Halep (Romania) during the Women's Tennis Association (WTA) finals.

24.10.2014#2516706

Simona Halep (Romania) competes in the red group match against Ana Ivanovic (Serbia) during the Women's Tennis Association (WTA) finals. Multiple exposure photograph.

24.10.2014#2516702

Ana Ivanovic (Serbia) competes in the red group match against Simona Halep (Romania) during the Women's Tennis Association (WTA) finals. Multiple exposure photograph.

24.10.2014#2516700

Simona Halep (Romania) competes in the red group match against Ana Ivanovic (Serbia) during the Women's Tennis Association (WTA) finals.

24.10.2014#2516698

Simona Halep (Romania) competes in the red group match against Ana Ivanovic (Serbia) during the Women's Tennis Association (WTA) finals.

24.10.2014#2516697

Ana Ivanovic (Serbia) competes in the red group match against Simona Halep (Romania) during the Women's Tennis Association (WTA) finals.

24.10.2014#2516689

Ana Ivanovic (Serbia) competes in the red group match against Simona Halep (Romania) during the Women's Tennis Association (WTA) finals.

24.10.2014#2516688

Serbia's Ana Ivanovic and Romania's Simona Halep before the red group ma Women's Tennis Association (WTA) finals

24.10.2014#2516592

Spectators during the white group match between Caroline Wozniacki (Denmark) and Petra Kvitova (Czech Republic) during the final Women's Tennis Association (WTA) tournament.

24.10.2014#2516577

Caroline Wozniacki (Denmark) competes against Petra Kvitova (Czech Republic) in the white group match during the final Women's Tennis Association (WTA) tournament in Singapore.

24.10.2014#2516572

Petra Kvitova (Czech Republic) competes against Caroline Wozniacki (Denmark) in the white group match during the final Women's Tennis Association (WTA) tournament in Singapore.

24.10.2014#2516570

Petra Kvitova (Czech Republic) congratulates Caroline Wozniacki (Denmark) for winning in the white group match during the final Women's Tennis Association (WTA) tournament in Singapore.

24.10.2014#2516567

Petra Kvitova (Czech Republic) competes against Caroline Wozniacki (Denmark) in the white group match during the final Women's Tennis Association (WTA) tournament in Singapore.

24.10.2014#2516566

Petra Kvitova (Czech Republic) competes against Caroline Wozniacki (Denmark) in the white group match during the final Women's Tennis Association (WTA) tournament in Singapore.

24.10.2014#2516550

Petra Kvitova (Czech Republic) competes against Caroline Wozniacki (Denmark) in the white group match during the final Women's Tennis Association (WTA) tournament in Singapore.

24.10.2014#2516547

Petra Kvitova (Czech Republic) competes against Caroline Wozniacki (Denmark) in the white group match during the final Women's Tennis Association (WTA) tournament in Singapore.

24.10.2014#2516546

Caroline Wozniacki (Denmark) competes against Petra Kvitova (Czech Republic) in the white group match during the final Women's Tennis Association (WTA) tournament in Singapore.

24.10.2014#2516545

Caroline Wozniacki (Denmark) celebrates victory in the white group match against Petra Kvitova (Czech Republic) during the final Women's Tennis Association (WTA) tournament in Singapore.

24.10.2014#2516544

Caroline Wozniacki (Denmark) competes against Petra Kvitova (Czech Republic) in the white group match during the final Women's Tennis Association (WTA) tournament in Singapore.

24.10.2014#2516543

Caroline Wozniacki (Denmark) competes against Petra Kvitova (Czech Republic) in the white group match during the final Women's Tennis Association (WTA) tournament in Singapore.

24.10.2014#2516542

Caroline Wozniacki (Denmark) plays against Petra Kvitova (Czech Republic) in the White Group match of the season-ending 2014 WTA Finals in Singapore.

24.10.2014#2516541

Caroline Wozniacki (Denmark) plays against Petra Kvitova (Czech Republic) in the White Group match of the season-ending 2014 WTA Finals in Singapore.

24.10.2014#2516540

Maria Shapapova (Russia) plays against Agnieszka Radwanska (Poland) in the White Group match of the season-ending 2014 WTA Finals in Singapore.

24.10.2014#2516513

Maria Shapapova (Russia) plays against Agnieszka Radwanska (Poland) in the White Group match of the season-ending 2014 WTA Finals in Singapore.

24.10.2014#2516512

Maria Shapapova (Russia) celebrates her victory against Agnieszka Radwanska (Poland) in the White Group match of the season-ending 2014 WTA Finals in Singapore.

24.10.2014#2516508

Agnieszka Radwanska (Poland) congratulates Russia's Maria Shapapova on her ictory in the White Group match of the season-ending 2014 WTA Finals in Singapore.

24.10.2014#2516506

Agnieszka Radwanska (Poland) plays against Maria Shapapova (Russia) in the White Group match of the season-ending 2014 WTA Finals in Singapore.

24.10.2014#2516505

Maria Sharapova (Russia) celebrates her victory in the White Group match of the season-ending 2014 WTA Finals in Singapore against Poland's Agnieszka Radwanska.

24.10.2014#2516503

Maria Sharapova (Russia) celebrates her victory in the White Group match of the season-ending 2014 WTA Finals in Singapore against Poland's Agnieszka Radwanska.

24.10.2014#2516502

Spectators during the White Group match of the season-ending 2014 WTA Finals in Singapore between Russia's Maria Sharapova and Poland's Agnieszka Radwanska.

24.10.2014#2516501

Maria Sharapova (Russia) plays against Agnieszka Radwanska (Poland) in the White Group match of the season-ending 2014 WTA Finals in Singapore.

24.10.2014#2516500

Agnieszka Radwanska (Poland) plays against Maria Sharapova (Russia) in the White Group match of the season-ending 2014 WTA Finals in Singapore.

24.10.2014#2516499

Agnieszka Radwanska (Poland) plays against Maria Sharapova (Russia) in the White Group match of the season-ending 2014 WTA Finals in Singapore.

24.10.2014#2516497

Maria Sharapova (Russia) plays against Agnieszka Radwanska (Poland) in the White Group match of the season-ending 2014 WTA Finals in Singapore.

24.10.2014#2516496

Maria Sharapova (Russia) plays against Agnieszka Radwanska (Poland) in the White Group match of the season-ending 2014 WTA Finals in Singapore.

24.10.2014#2516493

Maria Sharapova (Russia) plays against Agnieszka Radwanska (Poland) in the White Group match of the season-ending 2014 WTA Finals in Singapore.

24.10.2014#2516489

Maria Sharapova (Russia) plays against Agnieszka Radwanska (Poland) in the White Group match of the season-ending 2014 WTA Finals in Singapore.

24.10.2014#2516488

Maria Sharapova (Russia) plays against Agnieszka Radwanska (Poland) in the White Group match of the season-ending 2014 WTA Finals in Singapore.

24.10.2014#2516487

Agnieszka Radwanska (Poland) plays against Maria Sharapova (Russia) in the White Group match of the season-ending 2014 WTA Finals in Singapore.

24.10.2014#2516486

Maria Sharapova (Russia) before the White Group match of the season-ending 2014 WTA Finals in Singapore against Agnieszka Radwanska (Poland).

24.10.2014#2516455

Agnieszka Radwanska (Poland) before the White Group match of the season-ending 2014 WTA Finals in Singapore against Maria Sharapove (Russia).

24.10.2014#2516454