Novak Djokovic of Serbia holds up the ATP World Tour Tennis singles trophy as he poses for photographers after defeating Roger Federer of Switzerland after the final in London, Monday, Nov. 12, 2012. (AP Photo/Sang Tan)

Associated Press
Novak Djokovic of Serbia holds up the ATP World Tour Tennis singles trophy as he poses for photographers after defeating Roger Federer of Switzerland after the final in London, Monday, Nov. 12, 2012. (AP Photo/Sang Tan)
Novak Djokovic of Serbia holds up the ATP World Tour Tennis singles trophy as he poses for photographers after defeating Roger Federer of Switzerland after the final in London, Monday, Nov. 12, 2012. (AP Photo/Sang Tan)
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