1990 Virginia Slims of Oklahoma – Singles

Manon Bollegraf was the defending champion, but lost in the final to 17-year-old Amy Frazier. The score was 6–4, 6–2.

Seeds
• # Manuela Maleeva-Fragnière (semifinals)

• # 🇮🇹 Raffaella Reggi (second round)

• # 🇺🇸 Amy Frazier (champion)

• # 🇸🇪 Catarina Lindqvist (second round)

• # Manon Bollegraf (final)

• # 🇦🇺 Anne Minter (quarterfinals)

• # 🇺🇸 Betsy Nagelsen (first round)

• # 🇯🇵 Etsuko Inoue (quarterfinals)