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Grigor Dimitrov of Bulgaria returns the ball during the men's singles 4th round match against Frances Tiafoe of the United States 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
