NEW YORK, NY - SEPTEMBER 05: Roger Federer of Switzerland shakes hands with Philipp Kohlschreiber of Germany after defeating him during their Men's Singles Third Round match on Day Six of the 2015 US Open at the USTA Billie Jean King National Tennis Center on September 5, 2015 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Elsa/Getty Images)
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