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

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