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BEIJING, CHINA - OCTOBER 06: Grigor Dimitrov of Bulgaria returns a shot against Roberto Bautista Agut of Spain during the Men's Quarterfinal match on day seven of the 2017 China Open at the China National Tennis Centre on October 6, 2017 in Beijing, China. (Photo by Emmanuel Wong/Getty Images)

BEIJING, CHINA - OCTOBER 06:  Grigor Dimitrov of Bulgaria returns a shot against Roberto Bautista Agut of Spain during the Men's Quarterfinal match on day seven of the 2017 China Open at the China National Tennis Centre on October 6, 2017 in Beijing, China.  (Photo by Emmanuel Wong/Getty Images)