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

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