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Roger Federer of Switzerland serves during the men's singles second round match against Jan-Lennard Struff of Germany at Australian Open 2018 in Melbourne, Australia, Jan. 18, 2018. Roger Federer won 3-0. (Xinhua/Bai Xuefei)
Roger Federer of Switzerland serves during the men's singles second round match against Jan-Lennard Struff of Germany at Australian Open 2018 in Melbourne, Australia, Jan. 18, 2018. Roger Federer won 3-0. (Xinhua/Bai Xuefei)