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Switzerland's Roger Federer reacts during the men's singles second round match against Russia's Daniil Medvedev at the Shanghai Masters tennis tournament on Oct. 10, 2018. (Xinhua/Fan Jun)
Switzerland's Roger Federer reacts during the men's singles second round match against Russia's Daniil Medvedev at the Shanghai Masters tennis tournament on Oct. 10, 2018. (Xinhua/Fan Jun)