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NEW YORK, NY - SEPTEMBER 01: Duckhee Lee of Korea against Sumeer Kumar of the United States during their junior boys' first round match on Day Eight of the 2014 US Open at the USTA Billie Jean King National Tennis Center on September 1, 2014 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Elsa/Getty Images)

NEW YORK, NY - SEPTEMBER 01:  Duckhee Lee of Korea against Sumeer Kumar of the United States during their junior boys' first round match on Day Eight of the 2014 US Open at the USTA Billie Jean King National Tennis Center on September 1, 2014 in the Flushing neighborhood of the Queens borough of New York City.  (Photo by Elsa/Getty Images)