Caroline Wozniacki returns the ball to Petra Kvitova during their semi final match at the Dubai Duty Free Tennis Championships. Ali Haider/EPA
Petra Kvitova plays a return to Caroline Wozniacki. Ali Haider/EPA
Caroline Wozniacki stretches for the ball against Petra Kvitova at the Aviation Club. Julian Finney/Getty Images
Petra Kvitova of Czech Republic in action against Caroline Wozniacki. Julian Finney/Getty Images
Petra Kvitova of the Czech Republic celebrates her win against Caroline Wozniacki of Denmark in the semifinals of the Dubai Duty Free Tennis Championships in Dubai, United Arab Emirates, Friday, Feb. 22, 2013. (AP Photo/Regi Varghese) *** Local Caption *** Mideast Emirates Dubai Tennis Championships.JPEG-017d9.jpg
Petra Kvitova is congratulated by Caroline Wozniacki after her semi-finals victory during day five of the Dubai Duty Free Tennis Championship. Julian Finney/Getty Images
Sara Errani returns the ball to Roberta Vinci at the Dubai Duty Free Tennis Championships. Ali Haider/EPA
Roberta Vinci returns to Sara Errani. Regi Varghese/AP
Sara Errani serves to Roberta Vinci at the Dubai Duty Free Tennis Championships. Ali Haider/EPA
Roberta Vinci returns the ball to her compatriot Sara Errani. Ali Haider/EPA
Sara Errani is congratulated by her compatriot Roberta Vinci after winning their semi final match at the Aviation Club. Ali Haider/EPA
Cara Black of Zimbabwe and Anastasia Rodionova of Australia in action in their doubles semi final match against Bethanie Mattek-Sands of USA and Sania Mirza of India. Julian Finney/Getty Images
Nuria Llagostera Vives of Spain and Jie Zheng of China lose to Nadia Petrova of Russia (l) and Katerina Srebotnik of Slovenia Julian Finney/Getty Images
Nuria Llagostera Vives of Spain and Jie Zheng of China congratulate Nadia Petrova of Russia and Katerina Srebotnik of Slovenia after their semi final doubles match. Julian Finney/Getty Images
