
Roger Federer of Switzerland hits the ball during the men's singles first-round match against Jurgen Melzer of Austria at the Australian Open Tennis Championships in Melbourne, Australia, Jan. 16, 2017. Federer won 3-1. (Xinhua/Bai Xue)

Roger Federer of Switzerland hits the ball during the men's singles first-round match against Jurgen Melzer of Austria at the Australian Open Tennis Championships in Melbourne, Australia, Jan. 16, 2017. Federer won 3-1. (Xinhua/Bai Xue)