Novak Djokovic of Serbia celebrates after winning against John Isner of the USA during their round of eight match, at the Paris Masters tennis at Bercy Arena in Paris, France, Thursday, Oct. 31, 2013. (AP Photo/Francois Mori)

France Tennis Paris Masters

Novak Djokovic of Serbia celebrates after winning against John Isner of the USA during their round of eight match, at the Paris Masters tennis at Bercy Arena in Paris, France, Thursday, Oct. 31, 2013. (AP Photo/Francois Mori)

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