2004 Abierto Mexicano Telefonica Movistar – Men's singles

Agustín Calleri was the defending champion but lost in the first round to Luis Horna.

Carlos Moyá won in the final 6–3, 6–0 against Fernando Verdasco.

Seeds
A champion seed is indicated in bold text while text in italics indicates the round in which that seed was eliminated.


 * 1) 🇪🇸 Carlos Moyá (champion)
 * 2)  Nicolás Massú (quarterfinals)
 * 3) 🇦🇷 Agustín Calleri (first round)
 * 4) 🇦🇷 Mariano Zabaleta (second round)
 * 5) 🇪🇸 Félix Mantilla Botella (second round)
 * 6) 🇦🇷 Gastón Gaudio (second round)
 * 7) 🇦🇷 Juan Ignacio Chela (semifinals)
 * 8) 🇮🇹 Filippo Volandri (quarterfinals)