2005 Croatia Open Umag – Singles

Guillermo Cañas was the defending champion, but did not participate.

Guillermo Coria won the title, defeating Carlos Moyá 6–2, 4–6, 6–2 in the final.

Seeds
• # 🇪🇸 Rafael Nadal (withdrew due to knee tendinitis)

• # 🇦🇷 Guillermo Coria (champion)

• # 🇪🇸 Tommy Robredo (quarterfinals)

• # 🇪🇸 David Ferrer (quarterfinals)

• # 🇨🇿 Jiří Novák (semifinals)

• # 🇪🇸 Carlos Moyá (final)

• # 🇪🇸 Juan Carlos Ferrero (quarterfinals)

• # 🇮🇹 Filippo Volandri (semifinals)

• # 🇪🇸 Alberto Martín (first round)