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NEW YORK, NEW YORK - AUGUST 31: Soonwoo Kwon of Korea returns a volley during his Men's Singles first round match against Thai-Son Kwiatkowski of the United States on Day One of the 2020 US Open at the USTA Billie Jean King National Tennis Center on August 31, 2020 in the Queens borough of New York City. (Photo by Matthew Stockman/Getty Images)

NEW YORK, NEW YORK - AUGUST 31: Soonwoo Kwon of Korea  returns a volley during his Men's Singles first round match against Thai-Son Kwiatkowski of the United States on Day One of the 2020 US Open at the USTA Billie Jean King National Tennis Center on August 31, 2020 in the Queens borough of New York City. (Photo by Matthew Stockman/Getty Images)