STUTTGART, GERMANY - APRIL 21: Caroline Wozniacki of Denmark concentrates during her Quarter Final match against Andrea Petkovic of Germany at the Porsche Tennis Grand Prix at Porsche Arena on April ... more 
STUTTGART, GERMANY - APRIL 21: Caroline Wozniacki of Denmark concentrates during her Quarter Final match against Andrea Petkovic of Germany at the Porsche Tennis Grand Prix at Porsche Arena on April 21, 2011 in Stuttgart, Germany. (Photo by Alex Grimm/Bongarts/Getty Images) less 
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Getty Images | Photo By Alex Grimm / Bongarts/Getty Images
Thu, Apr 21, 2011 2:32 PM EDT