David Sánchez was the defending champion but lost in the semifinals to Gustavo Kuerten.
Fernando González won in the final 7–5, 6–4 against Kuerten.
Seeds
Nicolás Massú (quarterfinals) Gustavo Kuerten (final) Mariano Zabaleta (quarterfinals) Gastón Gaudio (quarterfinals) Fernando González (champion) Juan Ignacio Chela (first round) Filippo Volandri (quarterfinals) Flávio Saretta (semifinals)
Draw
Finals
Top half
Bottom half
External links Singles draw Qualifying draw
it:Movistar Open 2004 - Singolare sk:Mužská dvojhra na Movistar Open 2004