1910 U.S. National Championships (tennis)  The 1910 U.S. National Championships (now known as the US Open) took place on the outdoor grass courts at the Newport Casino in Newport, United States. The men's singles tournament ran from 15 August until 25 August while the women's singles and doubles championship took place from 20 June to 26 June at the Philadelphia Cricket Club in Chestnut Hill. It was the 30th staging of the U.S. National Championships, and the third Grand Slam tennis event of the year. William Larned (USA) defeated Tom Bundy (USA) 6–1, 5–7, 6–0, 6–8, 6–1   Hazel Hotchkiss (USA) defeated Louise Hammond (USA) 6–4, 6–2   Fred Alexander (USA) / Harold Hackett (USA) defeated Tom Bundy (USA) / Trowridge Hendrick (USA) 6–1, 8–6, 6–3   Hazel Hotchkiss (USA) / Edith Rotch (USA) defeated Adelaide Browning (USA) / Edna Wildey (USA) 6–4, 6–4   Hazel Hotchkiss (USA) / Joseph Carpenter, Jr. (USA) defeated Edna Wildey (USA) / Herbert Morris Tilden (USA) 6–2, 6–2