Roger Federer of Switzerland celebrates with his trophy during the awarding ceremony for the men's singles event at the Australian Open tennis championships in Melbourne, Australia, Jan. 29, 2017.(Xinhua/Bai Xue)
Roger Federer of Switzerland celebrates with his trophy during the awarding ceremony for the men's singles event at the Australian Open tennis championships in Melbourne, Australia, Jan. 29, 2017.(Xinhua/Bai Xue)
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