The 1920 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 and the Philadelphia Cricket Club in Chestnut Hill, Philadelphia. The men's tournament, held in New York City, ran from August 30 until September 6, 1920, while the women's event in Chestnut Hill was held from September 20 through September 25, 1920. It was the 40th staging of the U.S. National Championships and the third Grand Slam tennis event of the year. US Open 1920: August 30 – September 25, 1920 at West Side Tennis Club (M) Philadelphia Cricket Club (W). Men's singles: Bill Tilden — 2nd major title. Women's singles: Molla Bjurstedt Mallory — 5th major title. Wiki link