John Isner of the USA returns the ball  to Serbia's Novak Djokovic, during their match at the Paris Masters tennis tournament, in the Paris Bercy stadium, Thursday Oct. 31, 2013.(AP Photo/Remy de la Mauviniere)

France Tennis Paris Masters

John Isner of the USA returns the ball to Serbia's Novak Djokovic, during their match at the Paris Masters tennis tournament, in the Paris Bercy stadium, Thursday Oct. 31, 2013.(AP Photo/Remy de la Mauviniere)

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