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.
23x16px Roger Federer defeated 23x15px Lleyton Hewitt, 6–0, 7–6(7–3), 6–0
- • It was Federer's 4th career Grand Slam singles title and his 1st title at the US Open. It was Federer's 9th title of the year, and his 20th overall.
23x15px Svetlana Kuznetsova defeated 23x15px Elena Dementieva, 6–3, 7–5
- • It was Kuznetsova's 1st career Grand Slam singles title.
23x15px Mark Knowles / 23x15px Daniel Nestor defeated Template:Country data IND Leander Paes / 23x15px David Rikl, 6–3, 6–3
- • It was Knowles' 2nd career Grand Slam doubles title and his 1st title at the US Open.
- • It was Nestor's 2nd career Grand Slam doubles title and his 1st title at the US Open.
23x15px Virginia Ruano Pascual / 23x15px Paola Suárez defeated 23x15px Svetlana Kuznetsova / 23x15px Elena Likhovtseva, 6–4, 7–5
- • It was Ruano Pascual's 7th career Grand Slam doubles title and her 3rd and last title at the US Open.
- • It was Suárez' 7th career Grand Slam doubles title and her 3rd and last title at the US Open.
23x15px Vera Zvonareva / 23x15px Bob Bryan defeated 23x15px Alicia Molik / 23x15px Todd Woodbridge, 6–3, 6–4
- • It was Zvonareva's 1st career Grand Slam mixed doubles title.
- • It was Bryan's 2nd career Grand Slam mixed doubles title and his 2nd (consecutive) title at the US Open.
23x15px Andy Murray defeated 23x15px Sergiy Stakhovsky, 6–4, 6–2
23x15px Michaëlla Krajicek defeated 23x15px Jessica Kirkland, 6–1, 6–1
23x15px Brendan Evans / 23x15px Scott Oudsema defeated 23x15px Andreas Beck / 23x15px Sebastian Rieschick, 4–6, 6–1, 6–2
23x15px Marina Erakovic / 23x15px Michaëlla Krajicek defeated 23x15px Mădălina Gojnea / 23x15px Monica Niculescu, 7–6(7–4), 6–0
- ^ Federer became the first Swiss player to win the US Open men's singles title.
- ^ Andy Murray reached the men's singles final in 2008, and won the men's singles title in 2012.