Roger Federer of Switzerland returns the ball during the men's singles second round match against Noah Rubin of the United States at the Australian Open Tennis Championships in Melbourne, Australia, Jan. 18, 2017. Federer won 3-0. (Xinhua/Bai Xue)
Roger Federer of Switzerland returns the ball during the men's singles second round match against Noah Rubin of the United States at the Australian Open Tennis Championships in Melbourne, Australia, Jan. 18, 2017. Federer won 3-0. (Xinhua/Bai Xue)