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CHENGDU, CHINA - OCTOBER 02: Karen Khachanov of Russia signs autograph for fans after winning the singles final match against Albert Ramos-Vinolas of Spain on Day 7 of 2016 ATP Chengdu Open at Sichuan International Tennis Centre on October 2, 2016 in Chengdu, China. (Photo by Zhong Zhi/Getty Images)

CHENGDU, CHINA - OCTOBER 02:  Karen Khachanov of Russia signs autograph for fans after winning  the singles final match against Albert Ramos-Vinolas of Spain on Day 7 of 2016 ATP Chengdu Open at Sichuan International Tennis Centre on October 2, 2016 in Chengdu, China.  (Photo by Zhong Zhi/Getty Images)