WASHINGTON, DC - AUGUST 02: Andy Murray of Great Britain returns a backhand shot to Marius Copil of Romania during Day Six of the Citi Open at the Rock Creek Tennis Center on August 2, 2018 in Washington, DC. (Photo by Mitchell Layton/Getty Images)
WASHINGTON, DC - AUGUST 02: Andy Murray of Great Britain returns a backhand shot to Marius Copil of Romania during Day Six of the Citi Open at the Rock Creek Tennis Center on August 2, 2018 in Washington, DC. (Photo by Mitchell Layton/Getty Images)