Carlos Moyá was the defending champion but lost in the final 6–4, 6–1 against Guillermo Coria.
Seeds
Guillermo Coria (champion) Carlos Moyá (final) Nicolás Massú (quarterfinals) Gustavo Kuerten (first round) Agustín Calleri (second round) Mariano Zabaleta (quarterfinals) Gastón Gaudio (first round) Juan Ignacio Chela (second round)
Draw
Finals
Top half
Bottom half
External links 2004 ATP Buenos Aires Main Draw Main Draw Qualifying Draw