Novak Djokovic of Serbia celebrates after winning the final of the ATP World Tour Finals singles tennis match against Rafael Nadal of Spain at the O2 Arena in London Monday, Nov. 11, 2013. (AP Photo/Sang Tan)

Britain Tennis ATP Finals

Novak Djokovic of Serbia celebrates after winning the final of the ATP World Tour Finals singles tennis match against Rafael Nadal of Spain at the O2 Arena in London Monday, Nov. 11, 2013. (AP Photo/Sang Tan)

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