NEW YORK, NY - SEPTEMBER 11: Roger Federer of Switzerland returns a shot to Stan Wawrinka of Switzerland during their Men's Singles Semifinals match on Day Twelve of the 2015 US Open at the USTA Billie Jean King National Tennis Center on September 11, 2015 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Maddie Meyer/Getty Images)
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