NEW YORK, NEW YORK - AUGUST 28: Kei Nishikori of Japan shakes hans after his Men's Singles second round match with Bradley Klahn of the United States on day three of the 2019 US Open at the USTA Billie Jean King National Tennis Center on August 28, 2019 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Al Bello/Getty Images)
