| Women's Singles | |
|---|---|
| 1989 OTB Open | |
| 1988 Champion |
|
| Champion |
|
| Runner-up |
|
| Final score | 6–4, 6–3 |
Gretchen Magers was the defending champion but lost in the semifinals to Laura Gildemeister.
Gildemeister won in the final 6–4, 6–3 against Marianne Werdel.
A champion seed is indicated in bold text while text in italics indicates the round in which that seed was eliminated. The top eight seeds received a bye to the second round.