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.
See main article: 2004 US Open – Men's singles. Roger Federer[1] defeated 
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.
See main article: 2004 US Open – Women's singles. 
Svetlana Kuznetsova defeated Elena Dementieva, 6–3, 7–5
• It was Kuznetsova's 1st career Grand Slam singles title.
See main article: 2004 US Open – Men's doubles. Mark Knowles / 
Daniel Nestor defeated 
Leander Paes / 
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.
See main article: 2004 US Open – Women's doubles. 
Virginia Ruano Pascual / 
Paola Suárez defeated Svetlana Kuznetsova / 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.
See main article: 2004 US Open – Mixed doubles. Vera Zvonareva / 
Bob Bryan defeated Alicia Molik / 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.
See main article: 2004 US Open – Boys' singles. 
Andy Murray[2] defeated 
Sergiy Stakhovsky, 6–4, 6–2
See main article: 2004 US Open – Girls' singles. Michaëlla Krajicek defeated Jessica Kirkland, 6–1, 6–1
See main article: 2004 US Open – Boys' doubles. Brendan Evans / Scott Oudsema defeated Andreas Beck / Sebastian Rieschick, 4–6, 6–1, 6–2
See main article: 2004 US Open – Girls' doubles. 
Marina Erakovic / Michaëlla Krajicek defeated 
Mădălina Gojnea / Monica Niculescu, 7–6(7–4), 6–0
James Blake → replaced by 
Kristof Vliegen
Julien Boutter → replaced by Gilles Elseneer Agustín Calleri → replaced by Kristian Pless Guillermo Coria → replaced by Arnaud Di Pasquale Scott Draper → replaced by Juan Mónaco Nicolas Escudé → replaced by Janko Tipsarević Thierry Ascione Kim Clijsters → replaced by Cara Black Lina Krasnoroutskaya → replaced by Nuria Llagostera Vives Sandrine Testud → replaced by Camille Pin