2004 Abierto Mexicano de Tenis Telefonica Movistar – Women's singles

Amanda Coetzer was the defending champion, but lost in second round to Marta Marrero.

Qualifier Iveta Benešová won the title by defeating Flavia Pennetta 7–6(7–5), 6–4 in the final. It was her first singles title of her career.

Seeds
The first two seeds received a bye into the second round. • # Amanda Coetzer (second round)

• # 🇯🇵 Shinobu Asagoe (second round)

• # 🇪🇸 María Sánchez Lorenzo (semifinals)

• # 🇫🇷 Émilie Loit (quarterfinals)

• # 🇫🇷 Marion Bartoli (second round)

• # Emmanuelle Gagliardi (first round)

• # 🇪🇸 Arantxa Parra Santonja (second round)

• # 🇸🇰 Ľudmila Cervanová (first round)