NEW YORK, NY - SEPTEMBER 01: Philipp Kohlschreiber of Germany returns a shot against Alexander Zverev of Germany during their Men's Singles First Round match on Day Two of the 2015 US Open at the USTA Billie Jean King National Tennis Center on September 1, 2015 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Alex Goodlett/Getty Images)
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