2004 Dutch Open – Singles

Nicolás Massú was the defending champion, but lost in the semifinals this year.

Martin Verkerk won the tournament, beating Fernando González in the final, 7–6(7–5), 4–6, 6–4.

Seeds
• # Nicolás Massú (semifinals)

• # Fernando González (final)

• # 🇵🇪 Luis Horna (first round)

• # Martin Verkerk (champion)

• # 🇪🇸 David Sánchez (quarterfinals)

• # 🇷🇺 Igor Andreev (quarterfinals)

• # 🇪🇸 Alberto Martín (quarterfinals)

• # 🇪🇸 Albert Montañés (first round)