2004 Swedish Open – Singles

Mariano Zabaleta was the defending champion, and defended his title defeating Gastón Gaudio 6–1, 4–6, 7–6(7–4) in the final.

Seeds
• # 🇪🇸 Carlos Moyá (withdrew because of a shoulder injury)

• # 🇦🇷 Gastón Gaudio (final)

• # Nicolás Massú (first round)

• # 🇦🇷 Juan Ignacio Chela (quarterfinals)

• # 🇪🇸 Tommy Robredo (second round)

• # Fernando González (semifinals)

• # 🇸🇪 Jonas Björkman (first round)

• # 🇦🇷 Mariano Zabaleta (champion)

• # 🇷🇺 Mikhail Youzhny (first round)