NEW YORK, NY - SEPTEMBER 01: Philipp Kohlschreiber of Germany reacts against Novak Djokovic of Serbia during their men's singles fourth round match on Day Eight of the 2014 US Open at the USTA Billie Jean King National Tennis Center on September 1, 2014 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Al Bello/Getty Images)
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