Serbia's Janko Tipsarevic returns the ball to Andy Murray from Britain during 

Serbia's Janko Tipsarevic returns the ball to Andy Murray from Britain during the first day of Mubadala Tennis Championship in Abu Dhabi, United Arab Emirates, Thursday, Dec. 27, 2012. (AP Photo/Kamran Jebreili)
Associated Press
Serbia's Janko Tipsarevic returns the ball to Andy Murray from Britain during the first day of Mubadala Tennis Championship in Abu Dhabi, United Arab Emirates, Thursday, Dec. 27, 2012. (AP Photo/Kamran Jebreili)
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