
Roger Federer of Switzerland competes during the men's singles quarterfinal match against Mischa Zverev of Germany at the Australian Open Tennis Championships in Melbourne, Australia, Jan. 24, 2017. Federer won 3-0. (Xinhua/Bai Xue)

Roger Federer of Switzerland competes during the men's singles quarterfinal match against Mischa Zverev of Germany at the Australian Open Tennis Championships in Melbourne, Australia, Jan. 24, 2017. Federer won 3-0. (Xinhua/Bai Xue)