Jason Kubler Pictures
NEW YORK, NY - AUGUST 29: Taylor Fritz of the United States shakes hands with Jason Kubler of Australia after he withdrew from his men's singles second round match on Day Three of the 2018 US Open at the USTA Billie Jean King National Tennis Center on August 29, 2018 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Al Bello/Getty Images)