All four players to reach the semifinals at the U.S. Open are Americans. The last time that happened was 1981, when the lineup was Martina Navratilova, Chris Evert, Barbara Potter and Tracy Austin.

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Source:: http://www.npr.org/2017/09/07/549098176/4-american-women-reach-u-s-open-tennis-semifinals?utm_medium=RSS&utm_campaign=sports