Serbia's Novak Djokovic returns the ball to John Isner of the USA, 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

Serbia's Novak Djokovic returns the ball to John Isner of the USA, 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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