The 1931 U.S. National Championships was a tennis tournament that took place on the outdoor grass courts at the West Side Tennis Club, Forest Hills in New York City, New York. The tournament ran from September 3 until September 10. It was the 51st staging of the U.S. National Championships and the fourth Grand Slam tennis event of the year. US Open 1931: September 3–3, 1931 at West Side Tennis Club. Men's singles: Ellsworth Vines. Women's singles: Helen Wills Moody — 14th major title. Wiki link