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Roger Federer of Switzerland reacts during the singles group match against Dominic Thiem of Austria at the ATP World Tour Finals 2019 in London, Britain on Nov. 10, 2019. (Xinhua/Han Yan)
Roger Federer of Switzerland reacts during the singles group match against Dominic Thiem of Austria at the ATP World Tour Finals 2019 in London, Britain on Nov. 10, 2019. (Xinhua/Han Yan)