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