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NEW YORK, NY - SEPTEMBER 05: Andy Murray of Great Britain returns a shot to Grigor Dimitrov of Bulgaria during his fourth round Men's Singles match on Day Eight of the 2016 US Open at the USTA Billie Jean King National Tennis Center on September 5, 2016 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Mike Hewitt/Getty Images)

NEW YORK, NY - SEPTEMBER 05:  Andy Murray of Great Britain returns a shot to Grigor Dimitrov of Bulgaria during his fourth round Men's Singles match on Day Eight of the 2016 US Open at the USTA Billie Jean King National Tennis Center on September 5, 2016 in the Flushing neighborhood of the Queens borough of New York City.  (Photo by Mike Hewitt/Getty Images)