| 2004 US Open | |
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| Date | August 30 - September 12 |
| Edition | 124th |
| Category | Grand Slam (ITF) |
| Surface | Hardcourt |
| Location | New York City, USA |
| Venue | USTA Billie Jean King National Tennis Center |
| Champions | |
| Men's Singles | |
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| Women's Singles | |
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| Men's Doubles | |
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| Women's Doubles | |
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| Mixed Doubles | |
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| Boys' Singles | |
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| Girls' Singles | |
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| Boys' Doubles | |
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| Girls' Doubles | |
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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 defences, 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.
Roger Federer defeated
Lleyton Hewitt, 6–0, 7–6(7–3), 6–0
Svetlana Kuznetsova defeated
Elena Dementieva, 6–3, 7–5