2004 US Open – Women's singles

Svetlana Kuznetsova defeated Elena Dementieva in the final, 6–3, 7–5 to win the women's singles tennis title at the 2004 US Open. It was her first major title, and she lost only one set during the tournament (to Lindsay Davenport in the semifinals). Kuznetsova became the third Russian woman, after Anastasia Myskina and Maria Sharapova (who won the French Open and Wimbledon, respectively, earlier in the season), to win a major that year and overall. This was also the second-ever all-Russian major final (the first being at the French Open earlier in the season, where Myskina defeated Dementieva).

Justine Henin was the defending champion, but was defeated by Nadia Petrova in the fourth round. As a result, Amélie Mauresmo became the new world No. 1 following the tournament.

This marked the first US Open main draw appearance for 2011 champion Samantha Stosur, who was defeated by Petrova in the second round.

The quarterfinal match between Serena Williams and Jennifer Capriati is often considered the catalyst for the International Tennis Federation adoption of Hawk-Eye triangulation technology to review line calls. Hawk-Eye was unofficially used for television coverage for the match, with results suggesting that several crucial points awarded to Capriati were incorrectly called. The most egregious of these errors was a potential Williams winner at deuce in the first game of the final set that appeared to be well within the left baseline; while the line judge called the ball in, the chair umpire Mariana Alves overruled to award the point to Capriati. Capriati ultimately ended up winning the deuce, the set, and the match. Following outcry from spectators and the press, the United States Tennis Association suspended Alves for the remainder of the tournament and apologized to Williams. The ITF tested the Hawk-Eye system in an official capacity the next year, ultimately approving it for official use.

Seeds
• # 🇧🇪 Justine Henin (fourth round)

• # 🇫🇷 Amélie Mauresmo (quarterfinals)

• # 🇺🇸 Serena Williams (quarterfinals)

• # 🇷🇺 Anastasia Myskina (second round)

• # 🇺🇸 Lindsay Davenport (semifinals)

• # 🇷🇺 Elena Dementieva (final)

• # 🇷🇺 Maria Sharapova (third round)

• # 🇺🇸 Jennifer Capriati (semifinals)

• # 🇷🇺 Svetlana Kuznetsova (champion)

• # 🇷🇺 Vera Zvonareva (fourth round)

• # 🇺🇸 Venus Williams (fourth round)

• # 🇯🇵 Ai Sugiyama (fourth round)

• # 🇦🇷 Paola Suárez (third round)

• # 🇷🇺 Nadia Petrova (quarterfinals)

• # Patty Schnyder (fourth round)

• # 🇮🇹 Francesca Schiavone (fourth round)

• # 🇦🇺 Alicia Molik (second round)

• # Karolina Šprem (first round)

• # 🇮🇹 Silvia Farina Elia (third round)

• # 🇺🇸 Chanda Rubin (third round)

• # 🇺🇸 Amy Frazier (third round)

• # 🇧🇬 Magdalena Maleeva (second round)

• # 🇨🇴 Fabiola Zuluaga (third round)

• # 🇮🇱 Anna Smashnova-Pistolesi (first round)

• # 🇷🇺 Elena Likhovtseva (first round)

• # 🇷🇺 Elena Bovina (third round)

• # 🇫🇷 Mary Pierce (fourth round)

• # 🇫🇷 Nathalie Dechy (third round)

• # Eleni Daniilidou (fourth round)

• # 🇫🇷 Tatiana Golovin (third round)

• # 🇻🇪 María Vento-Kabchi (third round)

• # 🇺🇸 Meghann Shaughnessy (first round)