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CHENGDU, CHINA - SEPTEMBER 24: Tim Smyczek of the United States returns a shot against Joao Sousa of Portugal during 2018 ATP Chengdu Open at Sichuan International Tennis Centre on September 24, 2018 in Chengdu, China. (Photo by Zhong Zhi/Getty Images)

CHENGDU, CHINA - SEPTEMBER 24:  Tim Smyczek of the United States returns a shot against Joao Sousa of Portugal during 2018 ATP Chengdu Open at Sichuan International Tennis Centre on September 24, 2018 in Chengdu, China.  (Photo by Zhong Zhi/Getty Images)