2005 Movistar Open – Singles

Fernando González was the defending champion.

Gastón Gaudio won the title, defeating González 6–3, 6–4 in the final.

Seeds

 * 1) 🇦🇷 Gastón Gaudio (champion)
 * 2)  Fernando González (final)
 * 3) 🇮🇹 Filippo Volandri (semifinals)
 * 4) 🇪🇸 David Ferrer (semifinals)
 * 5) 🇦🇷 Mariano Zabaleta (quarterfinals)
 * 6) 🇦🇷 José Acasuso (quarterfinals)
 * 7) 🇦🇷 Agustín Calleri (quarterfinals)
 * 8) 🇮🇹 Potito Starace (first round)