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NEW YORK, NY - SEPTEMBER 2: Madison Keys of USA in action during her third round match on day 5 of the 2016 US Open at USTA Billie Jean King National Tennis Center on September 2, 2016 in New York City. (Photo by Jean Catuffe/Getty Images)

NEW YORK, NY - SEPTEMBER 2: Madison Keys of USA in action during her third round match on day 5 of the 2016 US Open at USTA Billie Jean King National Tennis Center on September 2, 2016 in New York City. (Photo by Jean Catuffe/Getty Images)