# 1989 OTB Open – Women's singles

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.

## Seeds

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.
* Gretchen Magers (semifinals)
* Halle Cioffi (second round)
* Ann Grossman (third round)
* Betsy Nagelsen (second round)
* Ann Henricksson (quarterfinals)
* Carrie Cunningham (second round)
* Beverly Bowes (third round)
* Laura Gildemeister (champion)
* Louise Allen (third round)
* Eva Krapl (second round)
* Stacey Martin (quarterfinals)
* Beth Herr (third round)
* Hu Na (third round)
* Marianne Werdel (final)
* Kim Kessaris (second round)
* Michelle Jaggard (second round)

## 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

### Finals

| Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final |
| 1 | Gretchen Magers | 4 | 3 | | | | |
| 8 | Laura Gildemeister | 6 | 6 | | | | |
| 8 | Laura Gildemeister | 6 | 6 | 8 | Laura Gildemeister | 6 | 6 |
| | | | | 14 | Marianne Werdel | 4 | 3 |
| 14 | Marianne Werdel | 6 | 6 | 14 | Marianne Werdel | 4 | 3 |
| 2 | Halle Cioffi | 2 | 0 | | | | |

### Top half
#### Section 1

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | | 1 | G Magers | 6 | 6 | | | | | | | | | | |
| | L Green | 6 | 6 | | | L Green | 3 | 4 | | | | | | | | | | |
| | A Scott | 0 | 0 | | | | | | | 1 | G Magers | 6 | 4 | 6 | | | | |
| | A Hobbs | 2 | 4 | | | | | | | 9 | L Allen | 2 | 6 | 4 | | | | |
| | P Hy | 6 | 6 | | | P Hy | 2 | 2 | | | | | | | | | | |
| | V Nelson-Dunbar | 7 | 5 | 1 | 9 | L Allen | 6 | 6 | | | | | | | | | | |
| 9 | L Allen | 5 | 7 | 6 | | | | | | | | | | | 1 | G Magers | 6 | 6 |
| 13 | H Na | 6 | 6 | | | | | | | | | | | | 5 | A Henricksson | 3 | 2 |
| | J Smoller | 4 | 2 | | 13 | H Na | 6 | 4 | 6 | | | | | | | | | |
| | L Poruri | 6 | 6 | | | L Poruri | 3 | 6 | 0 | | | | | | | | | |
| | A Leand | 1 | 3 | | | | | | | 13 | H Na | 1 | 3 | | | | | |
| | J Santrock | 6 | 6 | | | | | | | 5 | A Henricksson | 6 | 6 | | | | | |
| | C Christian | 2 | 4 | | | J Santrock | 4 | 4 | | | | | | | | | | |
| | | | | | 5 | A Henricksson | 6 | 6 | | | | | | | | | | |

#### Section 2

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | | 4 | B Nagelsen | 3 | 2 | | | | | | | | | |
| | R Baranski | 6 | 6 | | | R Baranski | 6 | 6 | | | | | | | | | |
| | B Gerken | 4 | 3 | | | | | | | | R Baranski | 6 | 6 | | | | |
| | J Thomas | 2 | 5 | | | | | | | | D Graham | 3 | 1 | | | | |
| | D Graham | 6 | 7 | | | D Graham | 6 | 6 | | | | | | | | | |
| | L-A Eldredge | 3 | 6 | 2 | 16 | M Jaggard | 3 | 4 | | | | | | | | | |
| 16 | M Jaggard | 6 | 4 | 6 | | | | | | | | | | | R Baranski | 4 | 4 |
| 12 | B Herr | 6 | 6 | | | | | | | | | | | 8 | L Gildemeister | 6 | 6 |
| | B Reinstadler | 3 | 1 | | 12 | B Herr | 2 | 6 | 6 | | | | | | | | |
| | A Grousbeck | 6 | 6 | | | A Grousbeck | 6 | 4 | 4 | | | | | | | | |
| | A Creek | 3 | 3 | | | | | | | 12 | B Herr | 5 | 1 | | | | |
| | A Gavaldón | 7 | 6 | | | | | | | 8 | L Gildemeister | 7 | 6 | | | | |
| | L Barnard | 6 | 3 | | | A Gavaldón | 4 | 4 | | | | | | | | | |
| | | | | | 8 | L Gildemeister | 6 | 6 | | | | | | | | | |

### Bottom half
#### Section 3

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | | 7 | B Bowes | 6 | 6 | | | | | | | | | | |
| | T Wilmink | 5 | 1 | | | L Harvey-Wild | 1 | 2 | | | | | | | | | | |
| | L Harvey-Wild | 7 | 6 | | | | | | | 7 | B Bowes | 6 | 4 | 3 | | | | |
| | J Ingram | 6 | 6 | | | | | | | 14 | M Werdel | 3 | 6 | 6 | | | | |
| | A Aallonen | 2 | 2 | | | J Ingram | 0 | 7 | 3 | | | | | | | | | |
| | K Shin | 5 | 3 | | 14 | M Werdel | 6 | 6 | 6 | | | | | | | | | |
| 14 | M Werdel | 7 | 6 | | | | | | | | | | | | 14 | M Werdel | 6 | 6 |
| 11 | S Martin | 6 | 4 | 6 | | | | | | | | | | | 11 | S Martin | 4 | 1 |
| | K Gompert | 2 | 6 | 1 | 11 | S Martin | 6 | 6 | | | | | | | | | | |
| | R Field | 2 | 2 | | | A Ivan | 1 | 3 | | | | | | | | | | |
| | A Ivan | 6 | 6 | | | | | | | 11 | S Martin | 6 | 3 | 6 | | | | |
| | J Salmon | 2 | 5 | | | | | | | 3 | A Grossman | 3 | 6 | 3 | | | | |
| | L Antonoplis | 6 | 7 | | | L Antonoplis | 4 | 6 | | | | | | | | | | |
| | | | | | 3 | A Grossman | 6 | 7 | | | | | | | | | | |

#### Section 4

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | | 6 | C Cunningham | 6 | 6 | 6 | | | | | | | | | |
| | T Takagi | 6 | 6 | | | T Takagi | 2 | 7 | 7 | | | | | | | | | |
| | R Gaddie | 1 | 0 | | | | | | | | T Takagi | 3 | 1 | | | | | |
| | K Strohmeier-Merino | 4 | 1 | | | | | | | | S Birch | 6 | 6 | | | | | |
| | S Birch | 6 | 6 | | | S Birch | 6 | 7 | | | | | | | | | | |
| | E Iida | 4 | 5 | | 15 | K Kessaris | 3 | 5 | | | | | | | | | | |
| 15 | K Kessaris | 6 | 7 | | | | | | | | | | | | S Birch | 6 | 1 | 3 |
| 10 | E Krapl | 4 | 6 | 6 | | | | | | | | | | 2 | H Cioffi | 4 | 6 | 6 |
| | J Whalen | 6 | 1 | 1 | 10 | E Krapl | 6 | 4 | r | | | | | | | | | |
| | T Zambrzycki | 3 | 6 | 6 | | A Schwartz | 2 | 6 | | | | | | | | | | |
| | A Schwartz | 6 | 2 | 7 | | | | | | | A Schwartz | 1 | 4 | | | | | |
| | P Vásquez | 6 | 6 | | | | | | | 2 | H Cioffi | 6 | 6 | | | | | |
| | L Gould | 1 | 1 | | | P Vásquez | 6 | 4 | 3 | | | | | | | | | |
| | | | | | 2 | H Cioffi | 4 | 6 | 6 | | | | | | | | | |