Roger Federer of Switzerland reacts during the men's singles semifinal match against his compatriot Stan Wawrinka at the Australian Open tennis championships in Melbourne, Australia, Jan. 26, 2017. Roger Federer won 3-2. (Xinhua/Bai Xue)
Roger Federer of Switzerland reacts during the men's singles semifinal match against his compatriot Stan Wawrinka at the Australian Open tennis championships in Melbourne, Australia, Jan. 26, 2017. Roger Federer won 3-2. (Xinhua/Bai Xue)