Janko Tipsarevic of Serbia plays a return to Roger Federer of Switzerland during their singles tennis match at the ATP World Tour Finals in London Tuesday, Nov. 6, 2012. (AP Photo/Kirsty Wigglesworth)

Associated Press
Janko Tipsarevic of Serbia plays a return to Roger Federer of Switzerland during their singles tennis match at the ATP World Tour Finals in London Tuesday, Nov. 6, 2012. (AP Photo/Kirsty Wigglesworth)
Janko Tipsarevic of Serbia plays a return to Roger Federer of Switzerland during their singles tennis match at the ATP World Tour Finals in London Tuesday, Nov. 6, 2012. (AP Photo/Kirsty Wigglesworth)
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