1990 Chevrolet Classic – Singles

Luiz Mattar was the defending champion, but lost in the final to Martín Jaite. The score was 3–6, 6–4, 6–3.

Seeds
• # 🇺🇸 Jay Berger (quarterfinals)

• # 🇦🇷 Martín Jaite (champion)

• # 🇵🇪 Jaime Yzaga (first round)

• # 🇧🇷 Luiz Mattar (final)

• # Diego Pérez (withdrew)

• # 🇧🇷 Cássio Motta (quarterfinals)

• # 🇦🇷 Eduardo Bengoechea (semifinals)

• # 🇦🇷 Horacio de la Peña (second round)