NEW YORK, NEW YORK - AUGUST 27: Ivo Karlovic of Croatia returns a shot against Frances Tiafoe of the United States during their Men's Singles first round match on day two of the 2019 US Open at the USTA Billie Jean King National Tennis Center on August 27, 2019 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Elsa/Getty Images)
