John Isner hits a forehand against Novak Djokovic, from Serbia, during a quarterfinal match at the Western & Southern Open tennis tournament, Friday, Aug. 16, 2013, in Mason, Ohio. (AP Photo/Al Behrman)
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John Isner hits a forehand against Novak Djokovic, from Serbia, during a quarterfinal match at the Western & Southern Open tennis tournament, Friday, Aug. 16, 2013, in Mason, Ohio. (AP Photo/Al Behrman)
