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(190114) -- MELBOURNE, Jan. 14, 2019 (Xinhua) -- Roger Federer of Switzerland returns the ball during the men's singles first round match between Roger Federer of Switzerland and Denis Istomin of Uzbekistan at the 2019 Australian Open in Melbourne, Australia, Jan. 14, 2019. Roger Federer won 3-0. (Xinhua/Lui Siu Wai) - lvxiaowei - 14.01.2019 Melbourne Tenis Australian Open 2019 Foto: Xinhua / SIPA / Pressfocus