1991 Puerto Rico Open – Singles

Jennifer Capriati was the defending champion, but did not compete this year.

Julie Halard won the title by defeating Amanda Coetzer 7–5, 7–5 in the final.

Seeds
• # 🇺🇸 Gigi Fernández (quarterfinals)

• # 🇫🇷 Julie Halard (champion)

• # 🇧🇪 Sabine Appelmans (semifinals)

• # 🇫🇷 Mary Pierce (semifinals)

• # 🇩🇪 Barbara Rittner (quarterfinals)

• # 🇺🇸 Susan Sloane-Lundy (quarterfinals)

• # 🇦🇷 Florencia Labat (second round)

• # 🇮🇹 Federica Bonsignori (withdrew)