NEW YORK, NY - SEPTEMBER 13: Roger Federer of Switzerland reacts against Novak Djokovic of Serbia during their Men's Singles Final match on Day Fourteen of the 2015 US Open at the USTA Billie Jean King National Tennis Center on September 13, 2015 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Clive Brunskill/Getty Images)
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