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Roger Federer of Switzerland serves during the semifinal match against Denis Kudla of the United States at the Gerry Weber Tennis Open on June 23, 2018 in Halle, Germany. Roger Federer won 2-0. (Xinhua/Joachim Bywaletz)
Roger Federer of Switzerland serves during the semifinal match against Denis Kudla of the United States at the Gerry Weber Tennis Open on June 23, 2018 in Halle, Germany. Roger Federer won 2-0. (Xinhua/Joachim Bywaletz)