1990 Puerto Rico Open – Singles

Laura Gildemeister was the defending champion, but did not compete this year.

Jennifer Capriati won the title by defeating Zina Garrison 5–7, 6–4, 6–2 in the final.

Seeds
• # 🇺🇸 Zina Garrison (final)

• # 🇺🇸 Jennifer Capriati (champion)

• # 🇺🇸 Amy Frazier (first round)

• # 🇨🇦 Helen Kelesi (second round)

• # 🇮🇹 Raffaella Reggi (second round)

• # 🇺🇸 Gigi Fernández (semifinals)

• # 🇺🇸 Lori McNeil (second round)

• # 🇺🇸 Ann Grossman (quarterfinals)