NEW YORK, NY - SEPTEMBER 04: Yuta Shimizu of Japan serves to Vasil Kirkov of the United States during his first round Junior Boy's match on Day Seven of the 2016 US Open at the USTA Billie Jean King National Tennis Center on September 4, 2016 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Elsa/Getty Images)
