# 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.
* Lori McNeil (second round)
* Larisa Savchenko (second round)
* Raffaella Reggi (semifinals)
* Leila Meskhi (final)
* Ann Grossman (second round)
* Amy Frazier (quarterfinals)
* Dianne Balestrat (second round)
* Etsuko Inoue (semifinals)

## Draw
### Key

* Q = Qualifier
* WC = Wild card
* LL = Lucky loser
* Alt = Alternate
* SE = Special exempt
* PR = Protected ranking
* ITF = ITF entry
* JE = Junior exempt
* w/o = Walkover
* r = Retired
* d = Defaulted
* SR = Special ranking
| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final |
| 1 | L McNeil | 6 | 7 | | | | | | | | | | | | | | | | | | | |
| | N Miyagi | 4 | 6 | | 1 | L McNeil | 4 | 6 | 4 | | | | | | | | | | | | | |
| | B Nagelsen | 6 | 6 | | | B Nagelsen | 6 | 2 | 6 | | | | | | | | | | | | | |
| | H Na | 4 | 1 | | | | | | | | B Nagelsen | 6 | 3 | | | | | | | | | |
| Q | D Spence | 6 | 6 | 7 | | | | | | 8 | E Inoue | 7 | 6 | | | | | | | | | |
| | H Witvoet | 0 | 7 | 5 | Q | D Spence | 3 | 2 | r | | | | | | | | | | | | | |
| | A Dechaume | 6 | 2 | | 8 | E Inoue | 6 | 1 | | | | | | | | | | | | | | |
| 8 | E Inoue | 7 | 6 | | | | | | | | | | | | 8 | E Inoue | 0 | 2 | | | | |
| 4 | L Meskhi | 6 | 6 | | | | | | | | | | | | 4 | L Meskhi | 6 | 6 | | | | |
| | M Javer | 3 | 1 | | 4 | L Meskhi | 7 | 7 | | | | | | | | | | | | | | |
| | M Werdel | 6 | 6 | | | M Werdel | 6 | 6 | | | | | | | | | | | | | | |
| | A Kijimuta | 3 | 2 | | | | | | | 4 | L Meskhi | 6 | 7 | | | | | | | | | |
| | N Herreman | 6 | 6 | | | | | | | 6 | A Frazier | 2 | 6 | | | | | | | | | |
| Q | M-C Calleja | 2 | 3 | | | N Herreman | 6 | 3 | | | | | | | | | | | | | | |
| Q | Y Koizumi | 5 | 4 | | 6 | A Frazier | 7 | 6 | | | | | | | | | | | | | | |
| 6 | A Frazier | 7 | 6 | | | | | | | | | | | | | | | | 4 | Leila Meskhi | 4 | 4 |
| 7 | D Balestrat | 6 | 6 | | | | | | | | | | | | | | | | | Manon Bollegraf | 6 | 6 |
| | E Burgin | 3 | 2 | | 7 | D Balestrat | 2 | 6 | 3 | | | | | | | | | | | | | |
| | C Bassett-Seguso | 6 | 6 | | | C Bassett-Seguso | 6 | 1 | 6 | | | | | | | | | | | | | |
| | R Reis | 3 | 2 | | | | | | | | C Bassett-Seguso | 2 | 6 | 4/r | | | | | | | | |
| | E Krapl | 2 | 0 | | | | | | | 3 | R Reggi | 6 | 4 | 4 | | | | | | | | |
| | M Van Nostrand | 6 | 6 | | | M Van Nostrand | 3 | 7 | 4 | | | | | | | | | | | | | |
| | E Smylie | 7 | 2 | 4 | 3 | R Reggi | 6 | 5 | 6 | | | | | | | | | | | | | |
| 3 | R Reggi | 5 | 6 | 6 | | | | | | | | | | | 3 | R Reggi | 3 | 5 | | | | |
| 5 | A Grossman | 6 | 6 | | | | | | | | | | | | | M Bollegraf | 6 | 7 | | | | |
| LL | A Leand | 3 | 3 | | 5 | A Grossman | 3 | 4 | | | | | | | | | | | | | | |
| | M McGrath | 4 | 2 | | | C Porwik | 6 | 6 | | | | | | | | | | | | | | |
| | C Porwik | 6 | 6 | | | | | | | | C Porwik | 7 | 3 | 3 | | | | | | | | |
| | C Suire | 6 | 6 | 5 | | | | | | | M Bollegraf | 5 | 6 | 6 | | | | | | | | |
| | M Bollegraf | 7 | 2 | 7 | | M Bollegraf | 3 | 7 | 6 | | | | | | | | | | | | | |
| Q | S Schilder | 3 | 5 | | 2 | L Savchenko | 6 | 5 | 2 | | | | | | | | | | | | | |
| 2 | L Savchenko | 6 | 7 | | | | | | | | | | | | | | | | | | | |