NEW YORK, NY - SEPTEMBER 13: Novak Djokovic of Serbia (right) shakes hands with Roger Federer of Switzerland after their Men's Singles Final match on day fourteen of the 2015 US Open at 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 Jean Catuffe/Getty Images)
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