1989 Virginia Slims of Oklahoma – Singles

Lori McNeil was the defending champion but lost in the second round to Betsy Nagelsen.

Manon Bollegraf won in the final 6–4, 6–4 against Leila Meskhi.

Seeds
A champion seed is indicated in bold text while text in italics indicates the round in which that seed was eliminated.


 * 1) 🇺🇸 Lori McNeil (second round)
 * 2)  Larisa Savchenko (second round)
 * 3) 🇮🇹 Raffaella Reggi (semifinals)
 * 4)  Leila Meskhi (final)
 * 5) 🇺🇸 Ann Grossman (second round)
 * 6) 🇺🇸 Amy Frazier (quarterfinals)
 * 7) 🇦🇺 Dianne Balestrat (second round)
 * 8) 🇯🇵 Etsuko Inoue (semifinals)