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WASHINGTON, DC - AUGUST 01: Andy Murray of Great Britain returns a backhand shot to beat Kyle Edmund of the Great Britain during Day Five of the Citi Open at the Rock Creek Tennis Center on August 1, 2018 in Washington, DC. (Photo by Mitchell Layton/Getty Images)

WASHINGTON, DC - AUGUST 01:  Andy Murray of Great Britain returns a backhand shot to beat Kyle Edmund of the Great Britain during Day Five of the Citi Open at the Rock Creek Tennis Center on August 1, 2018 in Washington, DC.  (Photo by Mitchell Layton/Getty Images)