Illya Marchenko Pictures
NEW YORK, NY - SEPTEMBER 03: Nick Kyrgios of Australia retires against Illya Marchenko of the Ukraine during his third round Men's Singles match on Day Six of the 2016 US Open at the USTA Billie Jean King National Tennis Center on September 3, 2016 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Alex Goodlett/Getty Images)