The 1902 U.S. National Championships (now known as the US Open) was a Grand Slam tennis tournament. The men's tournament was held from August 18 to August 27 on the outdoor grass courts at the Newport Casino in Newport, Rhode Island. The women's tournament was held from June 24 to June 27 on the outdoor grass courts at the Philadelphia Cricket Club in Philadelphia, Pennsylvania, United States. It was the 22nd U.S. National Championships and the second Grand Slam tournament of the year. William Larned and Marion Jones won the singles titles.
See main article: 1902 U.S. National Championships – Men's singles. 
William Larned defeated 
Reginald Doherty 4–6, 6–2, 6–4, 8–6
See main article: 1902 U.S. National Championships – Women's singles. Marion Jones defeated Elisabeth Moore 6–1, 1–0, ret.
Reginald Doherty / Laurence Doherty defeated Holcombe Ward / Dwight F. Davis 11–9, 12–10, 6–4
Juliette Atkinson / Marion Jones defeated Maud Banks / Winona Closterman 6–2, 7–5
Elisabeth Moore / Wylie Grant defeated Elizabeth Rastall / Albert Hoskins 6–2, 6–1