Roger Federer of Switzerland hits a return during the quarterfinal match of the Men's Singles of the 2017 US Open tennis tournament against Juan Martin del Potro of Argentina in New York, the United States, Sept. 6, 2017. Juan Martin del Potro won 3-1. (Xinhua/Wang Ying)
In pics: US Open tennis on day 10
Source: Xinhua| 2017-09-07 15:55:08|Editor: liuxin
KEY WORDS: US Open
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