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BEIJING, CHINA - SEPTEMBER 30: Andrey Rublev of Russia returns a shot in the Men's singles first round match against Grigor Dimitrov of Bulgaria of 2019 China Open at the China National Tennis Center on September 30, 2019 in Beijing, China. (Photo by Lintao Zhang/Getty Images)

BEIJING, CHINA - SEPTEMBER 30:  Andrey Rublev of Russia returns a shot in the Men's singles first round match against Grigor Dimitrov of Bulgaria of 2019 China Open at the China National Tennis Center on September 30, 2019 in Beijing, China.  (Photo by Lintao Zhang/Getty Images)