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Bulgaria's Grigor Dimitrov hits a return during the singles quarterfinal match against Spain's Rafael Nadal at 2017 ATP Shanghai Masters tennis tournament in Shanghai, east China, on Oct. 13, 2017. (Xinhua/Fan Jun)

Bulgaria's Grigor Dimitrov hits a return during the singles quarterfinal match against Spain's Rafael Nadal at 2017 ATP Shanghai Masters tennis tournament in Shanghai, east China, on Oct. 13, 2017. (Xinhua/Fan Jun)