Stephens beats Mertens 2-0 in U.S. Open women's singles

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Sloane Stephens of the United States hits a return during the women's singles fourth round match against Elise Mertens of Belgium at the 2018 US Open in New York, the United States, Sept. 2, 2018. Stephens won 2-0. (Xinhua/Li Muzi)