Noak Djokovic of Serbia plays a return to Roger Federer of Switzerland during their ATP World Tour Tennis singles final match in London, Monday, Nov. 12, 2012. (AP Photo/Sang Tan)

Associated Press
Noak Djokovic of Serbia plays a return to Roger Federer of Switzerland during their ATP World Tour Tennis singles final match in London, Monday, Nov. 12, 2012. (AP Photo/Sang Tan)
Noak Djokovic of Serbia plays a return to Roger Federer of Switzerland during their ATP World Tour Tennis singles final match in London, Monday, Nov. 12, 2012. (AP Photo/Sang Tan)
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