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NEW YORK, NY - SEPTEMBER 01: Andrey Rublev of Russian returns a shot to Kevin Anderson of South Africa 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 Streeter Lecka/Getty Images)

NEW YORK, NY - SEPTEMBER 01:  Andrey Rublev of Russian returns a shot to  Kevin Anderson of South Africa 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 Streeter Lecka/Getty Images)