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Belinda Bencic celebrates after the women's singles quarterfinal match between Belinda Bencic of Switzerland and Donna Vekic of Croatia at the 2019 US Open in New York, the United States, Sept. 4, 2019. (Xinhua/Liu Jie)

Belinda Bencic celebrates after the women's singles quarterfinal match between Belinda Bencic of Switzerland and Donna Vekic of Croatia at the 2019 US Open in New York, the United States, Sept. 4, 2019. (Xinhua/Liu Jie)