Roger Federer of Sweitzerland serves during the men's singles second round match against Mikhail Youzhny of Russia at the 2017 US Open in New York, the United States, Aug. 31, 2017. Federer won 3-2. (Xinhua/Wang Ying)
In pics: 2017 U.S. Open in New York
Source:Xinhua| 2017-09-01 10:17:45|Editor: liuxin
KEY WORDS: tennis
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