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Croatia's Marin Cilic reacts 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 reacts 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)