Day four at the Dubai Duty Free Tennis Championships in Dubai. Ali Haider/EPA
Samantha Stosur returns the ball to Italy's Roberta Vinci. Ali Haider/EPA
Roberta Vinci of Italy celebrates after winning her match against Samantha Stosur at the Dubai Duty Free Tennis Championships. Ali Haider/EPA
Sara Errani returns to Nadia Petrova in their match in Dubai. Ali Haider/EPA
Nadia Petrova returns a shot to Sara Errani at the Dubai Duty Free Tennis Championships. Ali Haider/EPA
Sara Errani celebrates winning her match against Nadia Petrova. Julian Finney/Getty Images
Caroline Wozniacki returns a shot to Marion Bartoli at the Aviation Club. Ali Haider/EPA
Marion Bartoli plays a shot against Caroline Wozniacki at the Dubai Duty Free Tennis Championship. Julian Finney/Getty Images
Caroline Wozniacki celebrates after winning the match against Marion Bartoli. Ali Haider/EPA
Agnieszka Radwanska of Poland serves the ball to Czech Petra Kvitova. Ali Haider/EPA
Petra Kvitova returns the ball to Agnieszka Radwanska. Ali Haider/EPA
Petra Kvitova shakes hands after defeating Agnieszka Radwanska. Regi Varghese/AP
Caroline Wozniacki of Denmark exchanges gifts with Diego Maradona during day four of the WTA Dubai Duty Free Tennis Championship. Julian Finney/Getty Images
Action and images from the fourth day's play at the Aviation Club.
