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CHENGDU, CHINA - SEPTEMBER 28: Diego Schwartzman of Argentina returns a shot during the match against Paolo Lorenzi of Italy during Day 3 of 2016 ATP Chengdu Open at Sichuan International Tennis Centre on September 28, 2016 in Chengdu, China. (Photo by Zhong Zhi/Getty Images)

CHENGDU, CHINA - SEPTEMBER 28:  Diego Schwartzman of Argentina returns a shot during the match against Paolo Lorenzi of Italy during Day 3 of 2016 ATP Chengdu Open at Sichuan International Tennis Centre on September 28, 2016 in Chengdu, China.  (Photo by Zhong Zhi/Getty Images)