2005 Brasil Open – Singles

Gustavo Kuerten was the defending champion, but chose not to participate that year.

Rafael Nadal won in the final 6–0, 6–7(2–7), 6–1, against Alberto Martín.

Seeds
• # 🇦🇷 Gastón Gaudio (withdrew due to an athletic pubalgia)

• # Fernando González (first round)

• # 🇦🇷 Juan Ignacio Chela (second round)

• # 🇮🇹 Filippo Volandri (first round, retired because of a flu)

• # 🇪🇸 David Ferrer (first round, retired because of a flu)

• # 🇪🇸 Rafael Nadal (champion)

• # 🇦🇷 Mariano Zabaleta (quarterfinals)

• # 🇪🇸 Albert Costa (second round)

• # 🇧🇷 Ricardo Mello (semifinals)