Novak Djokovic of Serbia celebrates after he defeats Richard Gasquet of France in their ATP world Tour Finals tennis match at the O2 Arena on London, Saturday, Nov. 9, 2013. (AP Photo/Alastair Grant)

Britain Tennis ATP Finals

Novak Djokovic of Serbia celebrates after he defeats Richard Gasquet of France in their ATP world Tour Finals tennis match at the O2 Arena on London, Saturday, Nov. 9, 2013. (AP Photo/Alastair Grant)

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