2004 Campionati Internazionali di Sicilia – Singles

Nicolás Massú was the defending champion, but lost in the quarterfinals to Filippo Volandri.

Tomáš Berdych won the title by defeating Volandri 6–3, 6–3 in the final.

Seeds
• # Nicolás Massú (quarterfinals)

• # 🇦🇹 Florian Mayer (withdrew due to an arm injury)

• # 🇪🇸 Fernando Verdasco (second round)

• # 🇷🇺 Nikolay Davydenko (quarterfinals)

• # 🇮🇹 Filippo Volandri (final)

• # 🇪🇸 Rafael Nadal (second round)

• # 🇪🇸 David Ferrer (semifinals)

• # Tomáš Berdych (champion)