Updated: February 22, 2013, 12:00 AM
In Pictures: Dubai Tennis Championship - Day 4
epa03593249 Roberta Vinci of Italy celebrates after winning her match against Samantha Stosur of Australia during the fourth day of the Dubai Duty Free Tennis Championships in Dubai, United Arab Emirates, 21 February 2013. EPA/ALI HAIDER *** Local Caption *** 03593249.jpg
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
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
Caroline Wozniacki returns a shot to Marion Bartoli at the Aviation Club. Ali Haider/EPA
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
Sara Errani celebrates winning her match against Nadia Petrova. Julian Finney/Getty Images
Marion Bartoli plays a shot against Caroline Wozniacki at the Dubai Duty Free Tennis Championship. Julian Finney/Getty Images
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Petra Kvitova shakes hands after defeating Agnieszka Radwanska. Regi Varghese/AP