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Roger Federer of Switzerland competes during the singles match against Dominic Thiem of Austria during Day 3 of the 2018 Nitto ATP World Tour Finals at The O2 Arena in London, Britain on Nov. 13, 2018. (Xinhua/Han Yan)
Roger Federer of Switzerland competes during the singles match against Dominic Thiem of Austria during Day 3 of the 2018 Nitto ATP World Tour Finals at The O2 Arena in London, Britain on Nov. 13, 2018. (Xinhua/Han Yan)