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Roger Federer of Switzerland hits a return 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 hits a return 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)