2004 Generali Open – Singles

Guillermo Coria was the defending champion, but did not compete this year.

Nicolás Massú won the title by defeating Gastón Gaudio 7–6(7–3), 6–4 in the final.

Seeds
All seeds received a bye to the second round. • # 🇩🇪 Rainer Schüttler (semifinals)

• # 🇦🇷 Gastón Gaudio (final)

• # Nicolás Massú (champion)

• # 🇪🇸 Feliciano López (quarterfinals)

• # 🇦🇷 Mariano Zabaleta (quarterfinals)

• # 🇩🇪 Florian Mayer (quarterfinals)

• # 🇵🇪 Luis Horna (quarterfinals)

• # 🇪🇸 Fernando Verdasco (semifinals)

• # Irakli Labadze (second round)

• # 🇪🇸 David Ferrer (second round)

• # 🇪🇸 Albert Costa (third round)

• # 🇦🇹 Jürgen Melzer (second round)

• # 🇪🇸 David Sánchez (third round, retired)

• # 🇷🇺 Nikolay Davydenko (third round)

• # 🇨🇿 Tomáš Berdych (third round)

• # 🇪🇸 Albert Montañés (second round)