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GUANGZHOU, CHINA - MARCH 19: Zhe Li of China returns a shot during the match against Ze Zhang of China during the 2016 ?GDD CUP? International ATP Challenger Guangzhou Tour Day 5 match at Guangzhou Development District International Tennis School on March 19, 2016 in Guangzhou, China. (Photo by Zhong Zhi/Getty Images)

GUANGZHOU, CHINA - MARCH 19:  Zhe Li of China returns a shot during the match against Ze Zhang of China during the 2016 ?GDD CUP? International ATP Challenger Guangzhou Tour Day 5 match at Guangzhou Development District International Tennis School on March 19, 2016 in Guangzhou, China.  (Photo by Zhong Zhi/Getty Images)