Novak Djokovic of Serbia, right, greets John Isner of the USA after their round of eight match, at the Paris Masters tennis at Bercy Arena in Paris, France, Thursday, Oct. 31, 2013. Djokovic won the match 7-6, 6-1, 6-2.(AP Photo/Francois Mori)

France Tennis Paris Masters

Novak Djokovic of Serbia, right, greets John Isner of the USA after their round of eight match, at the Paris Masters tennis at Bercy Arena in Paris, France, Thursday, Oct. 31, 2013. Djokovic won the match 7-6, 6-1, 6-2.(AP Photo/Francois Mori)

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