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CHENGDU, CHINA - SEPTEMBER 28: Joao Sousa of Portugal returns a shot during his match against Malek Jaziri of Tunisia during 2018 ATP World Tour Chengdu Open at Sichuan International Tennis Centre on September 28, 2018 in Chengdu, China. (Photo by Zhong Zhi/Getty Images)

CHENGDU, CHINA - SEPTEMBER 28:  Joao Sousa of Portugal returns a shot during his match against Malek Jaziri of Tunisia during 2018 ATP World Tour Chengdu Open at Sichuan International Tennis Centre on September 28, 2018 in Chengdu, China.  (Photo by Zhong Zhi/Getty Images)