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.

Seniors

Men's singles

Roger Federer defeated 🇦🇺 Lleyton Hewitt, 6–0, 7–6(7–3), 6–0

Women's singles

🇷🇺 Svetlana Kuznetsova defeated 🇷🇺 Elena Dementieva, 6–3, 7–5

Men's doubles

Mark Knowles / 🇨🇦 Daniel Nestor defeated 🇮🇳 Leander Paes / 🇨🇿 David Rikl, 6–3, 6–3

Women's doubles

🇪🇸 Virginia Ruano Pascual / 🇦🇷 Paola Suárez defeated 🇷🇺 Svetlana Kuznetsova / 🇷🇺 Elena Likhovtseva, 6–4, 7–5

Mixed doubles

🇷🇺 Vera Zvonareva / 🇺🇸 Bob Bryan defeated 🇦🇺 Alicia Molik / 🇦🇺 Todd Woodbridge, 6–3, 6–4

Juniors

Boys' singles

🇬🇧 Andy Murray defeated 🇺🇦 Sergiy Stakhovsky, 6–4, 6–2

Girls' singles

Michaëlla Krajicek defeated 🇺🇸 Jessica Kirkland, 6–1, 6–1

Boys' doubles

🇺🇸 Brendan Evans / 🇺🇸 Scott Oudsema defeated 🇩🇪 Andreas Beck / 🇩🇪 Sebastian Rieschick, 4–6, 6–1, 6–2

Girls' doubles

🇳🇿 Marina Erakovic / Michaëlla Krajicek defeated 🇷🇴 Mădălina Gojnea / 🇷🇴 Monica Niculescu, 7–6(7–4), 6–0

Withdrawals