2003 Abierto Mexicano Telefonica Movistar – Men's singles

Carlos Moyá was the defending champion but lost in the quarterfinals to Félix Mantilla.

Agustín Calleri won in the final 7–5, 3–6, 6–3 against Mariano Zabaleta.

Seeds

 * 1) 🇪🇸 Carlos Moyá (quarterfinals)
 * 2) 🇦🇷 David Nalbandian (second round)
 * 3) 🇦🇷 Gastón Gaudio (second round)
 * 4)  Fernando González (quarterfinals)
 * 5) 🇦🇷 Juan Ignacio Chela (first round)
 * 6) 🇧🇷 Gustavo Kuerten (semifinals)
 * 7)  Marcelo Ríos (quarterfinals)
 * 8) 🇪🇨 Nicolás Lapentti (first round)