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