
Alexander Zverev of Germany celebrates after winning the men's singles quarterfinal match against Roberto Bautista Agut of Spain in the Gerry Weber Open 2017 in Halle, Germany, on June 23, 2017. Zverev won 2-1. (Xinhua/Joachim Bywaletz)

Alexander Zverev of Germany celebrates after winning the men's singles quarterfinal match against Roberto Bautista Agut of Spain in the Gerry Weber Open 2017 in Halle, Germany, on June 23, 2017. Zverev won 2-1. (Xinhua/Joachim Bywaletz)