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Roger Federer of Switzerland reacts during the men's singles 4th round match against Stefanos Tsitsipas of Greece at the Australian Open in Melbourne, Australia, Jan. 20, 2019. (Xinhua/Lui Siu Wai)
In pics: men's singles 4th round match at Australian Open
Source: Xinhua| 2019-01-20 18:57:53|Editor: mym
