NEW YORK, NY - SEPTEMBER 11: Stan Wawrinka of Switzerland returns a shot to Roger Federer 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 Clive Brunskill/Getty Images)
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