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NEW YORK, NY - SEPTEMBER 04: Sergiy Stakhovsky of Ukraine serves to Jo-Wilfried Tsonga of France during their Men's Singles Third Round match on Day Five of the 2015 US Open at the USTA Billie Jean King National Tennis Center on September 4, 2015 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Elsa/Getty Images)

NEW YORK, NY - SEPTEMBER 04:  Sergiy Stakhovsky of Ukraine serves to Jo-Wilfried Tsonga of France during their Men's Singles Third Round match on Day Five of the 2015 US Open at the USTA Billie Jean King National Tennis Center on September 4, 2015 in the Flushing neighborhood of the Queens borough of New York City.  (Photo by Elsa/Getty Images)