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Roger Federer of Switzerland celebrates during the singles match against Kevin Anderson of South Africa on Day 5 of the 2018 ATP World Tour Finals at the O2 Arena in London, Britain on Nov. 15, 2018. (Xinhua/Han Yan)
Roger Federer of Switzerland celebrates during the singles match against Kevin Anderson of South Africa on Day 5 of the 2018 ATP World Tour Finals at the O2 Arena in London, Britain on Nov. 15, 2018. (Xinhua/Han Yan)