2009 Copa Petrobras Buenos Aires – Singles

Martín Vassallo Argüello chose to not defend his 2008 title.

Horacio Zeballos won in the final 6–2, 3–6, 6–3, against Gastón Gaudio.

Seeds
• # 🇦🇷 Horacio Zeballos (champion)

• # 🇦🇷 Máximo González (quarterfinals)

• # Nicolás Massú (first round)

• # 🇦🇷 Juan Ignacio Chela (semifinals)

• # 🇪🇸 Santiago Ventura (quarterfinals)

• # 🇦🇷 Sergio Roitman (second round)

• # 🇪🇸 Rubén Ramírez Hidalgo (second round)

• # 🇫🇷 Laurent Recouderc (first round)