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