The 1913 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 August 18 until August 26 while the women's singles and doubles championship took place from June 9 to June 14 at the Philadelphia Cricket Club in Chestnut Hill. It was the 33rd staging of the U.S. National Championships, and the second Grand Slam tennis event of the year. Future seven-time singles champion Bill Tilden won his first U.S. Championship title, partnering Mary Browne in the mixed doubles.
See main article: 1913 U.S. National Championships – Men's singles. 
Maurice McLoughlin defeated R. Norris Williams 6–4, 5–7, 6–3, 6–1
See main article: 1913 U.S. National Championships – Women's singles. Mary Browne defeated Dorothy Green 6–2, 7–5
Maurice McLoughlin / Tom Bundy defeated John Strachan / Clarence Griffin 6–4, 7–5, 6–1
Mary Browne / Louise Riddell Williams defeated Dorothy Green / Edna Wildey 12–10, 2–6, 6–3
Mary Browne / Bill Tilden defeated Dorothy Green / C. S. Rogers 7–5, 7–5