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Japan's Kei Nishikori reacts during the men's singles quarterfinal match against Switzerland's Roger Federer at the Shanghai Masters tennis tournament on Oct. 12, 2018. Kei Nishikori lost 0-2. (Xinhua/Ding Ting)
Japan's Kei Nishikori reacts during the men's singles quarterfinal match against Switzerland's Roger Federer at the Shanghai Masters tennis tournament on Oct. 12, 2018. Kei Nishikori lost 0-2. (Xinhua/Ding Ting)