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Croatia's Marin Cilic hits a return during the singles semifinal match against Spain's Rafael Nadal at 2017 ATP Shanghai Masters tennis tournament in Shanghai, east China, on Oct. 14, 2017. (Xinhua/Fan Jun)

Croatia's Marin Cilic hits a return during the singles semifinal match against Spain's Rafael Nadal at 2017 ATP Shanghai Masters tennis tournament in Shanghai, east China, on Oct. 14, 2017. (Xinhua/Fan Jun)