NEW YORK, NY - AUGUST 29: Frances Tiafoe of the United States returns a shot to John Isner of the United States during his first round Men's Singles match on Day One of the 2016 US Open at the USTA Billie Jean King National Tennis Center on August 29, 2016 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Alex Goodlett/Getty Images)
