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