2005 ATP Buenos Aires – Singles

Gastón Gaudio defeated Mariano Puerta 6–4, 6–4 to win the 2005 ATP Buenos Aires singles competition. Guillermo Coria was the champion but did not defend his title.

Seeds

 * 1) 🇪🇸 Carlos Moyà (quarterfinals)
 * 2) 🇦🇷 Gastón Gaudio (champion)
 * 3) 🇦🇷 Guillermo Cañas (second round)
 * 4)  Fernando González (withdrew)
 * 5) 🇦🇷 Juan Ignacio Chela (first round)
 * 6) 🇮🇹 Filippo Volandri (first round)
 * 7) 🇪🇸 Rafael Nadal (quarterfinals)
 * 8) 🇦🇷 Mariano Zabaleta (second round)