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Roger Federer of Switzerland returns a shot during the singles semifinal against Stefanos Tsitsipas of Greece at the ATP World Tour Finals 2019 in London, Britain on Nov. 16, 2019. (Xinhua/Han Yan)
Roger Federer of Switzerland returns a shot during the singles semifinal against Stefanos Tsitsipas of Greece at the ATP World Tour Finals 2019 in London, Britain on Nov. 16, 2019. (Xinhua/Han Yan)