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
Carlos Moyà (quarterfinals) Gastón Gaudio (champion) Guillermo Cañas (second round) Fernando González (withdrew) Juan Ignacio Chela (first round) Filippo Volandri (first round) Rafael Nadal (quarterfinals) Mariano Zabaleta (second round)
Draw
Finals
Top half
Bottom half
External links 2005 ATP Buenos Aires Singles draw Doubles draw Qualifying Singles draw