| 2004 US Open | |
|---|---|
| Date | August 30 - September 12 |
| Edition | 124th |
| Category | Grand Slam (ITF) |
| Surface | Hardcourt |
| Location | New York City, U.S. |
| Venue | USTA Billie Jean King National Tennis Center |
| Champions | |
| Men's singles | |
 Roger Federer | |
| Women's singles | |
 Svetlana Kuznetsova | |
| Men's doubles | |
 Mark Knowles /  Daniel Nestor | |
| Women's doubles | |
 Virginia Ruano Pascual /  Paola Suárez | |
| Mixed doubles | |
 Bob Bryan / Vera Zvonareva | |
| Boys' singles | |
 Andy Murray | |
| Girls' singles | |
 Michaëlla Krajicek | |
| Boys' doubles | |
| Brendan Evans / Scott Oudsema | |
| Girls' doubles | |
 Marina Erakovic / Michaëlla Krajicek | |
The 2004 US Open was held between August 30, 2004 – September 12, 2004.
Both Andy Roddick and Justine Henin-Hardenne were unsuccessful in their title defenses, Roddick losing in the quarter-finals to Joachim Johansson and Henin-Hardenne falling in the fourth round to Nadia Petrova. On the men's side, Roger Federer won his first US Open, defeating rival and 2001 champion Lleyton Hewitt in a lopsided final. Svetlana Kuznetsova won the women's title defeating Elena Dementieva in the final.