
Roger Federer from Switzerland celebrates after winning his final match against Alexander Zverev from Germany at the Gerry Weber Open tennis tournament in Halle, western Germany, on June 25, 2017. (Xinhua/Joachim Bywaletz)

Roger Federer from Switzerland celebrates after winning his final match against Alexander Zverev from Germany at the Gerry Weber Open tennis tournament in Halle, western Germany, on June 25, 2017. (Xinhua/Joachim Bywaletz)