Novak Djokovic of Serbia reacts after defeating John Isner of the USA 6-7 (5), 6-1, 6-2 to reach the quarterfinals of the Paris Masters tennis tournament at Bercy Arena in Paris, France, Thursday, Oct. 31, 2013. (AP Photo/Francois Mori)

France Tennis Paris Masters

Novak Djokovic of Serbia reacts after defeating John Isner of the USA 6-7 (5), 6-1, 6-2 to reach the quarterfinals of the Paris Masters tennis tournament at Bercy Arena in Paris, France, Thursday, Oct. 31, 2013. (AP Photo/Francois Mori)

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