NEW YORK, NY - AUGUST 29: John Isner and Frances Tiafoe of the United States embrace after their 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. John Isner of the United States defeated Frances Tiafoe in five sets. (Photo by Alex Goodlett/Getty Images)

NEW YORK, NY - AUGUST 29:  John Isner and Frances Tiafoe of the United States embrace after their 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. John Isner of the United States defeated Frances Tiafoe in five sets.  (Photo by Alex Goodlett/Getty Images)