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Madison Keys of the United States serves during the women's singles semi-final against Sloane Stephens of the United States at the French Open Tennis Tournament 2018 in Paris, France on June 7, 2018. (Xinhua/Chen Yichen)
Madison Keys of the United States serves during the women's singles semi-final against Sloane Stephens of the United States at the French Open Tennis Tournament 2018 in Paris, France on June 7, 2018. (Xinhua/Chen Yichen)