In pics: men's singles 4th round match at Australian Open

Source: Xinhua| 2019-01-20 18:57:53|Editor: mym
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(SP)AUSTRALIA-MELBOURNE-TENNIS-AUSTRALIAN OPEN

Roger Federer of Switzerland serves the ball during the men's singles 4th round match against Stefanos Tsitsipas of Greece at the Australian Open in Melbourne, Australia, Jan. 20, 2019. (Xinhua/Bai Xuefei)

KEY WORDS: Australian Open
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