Novak Djokovic of Serbia grimaces after he loses a point against Richard Gasquet of France during their ATP World Tour Finals tennis match at the O2 Arena in London, Saturday, Nov. 9, 2013. (AP Photo/Alastair Grant)

Britain Tennis ATP Finals

Novak Djokovic of Serbia grimaces after he loses a point against Richard Gasquet of France during their ATP World Tour Finals tennis match at the O2 Arena in London, Saturday, Nov. 9, 2013. (AP Photo/Alastair Grant)

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