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Roger Federer of Switzerland hits a return during the men's singles first round match against Lorenzo Sonego of Italy at French Open tennis tournament 2019 in Paris, France on May 26, 2019. (Xinhua/Han Yan)

Roger Federer of Switzerland hits a return during the men's singles first round match against Lorenzo Sonego of Italy at French Open tennis tournament 2019 in Paris, France on May 26, 2019. (Xinhua/Han Yan)