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NEW YORK, NEW YORK - AUGUST 22: Marin Cilic of Croatia serves to Denis Shapovalov of Canada during the Western & Southern Open at the USTA Billie Jean King National Tennis Center on August 22, 2020 in New York City. (Photo by Matthew Stockman/Getty Images)

NEW YORK, NEW YORK - AUGUST 22:  Marin Cilic of Croatia serves to Denis Shapovalov of Canada during the Western & Southern Open at the USTA Billie Jean King National Tennis Center on August 22, 2020 in New York City. (Photo by Matthew Stockman/Getty Images)