# 1990 OTB International Open – Women's singles

Laura Gildemeister was the defending champion, but lost in the second round to Anke Huber.
Huber, who was 15-years old, won the title by defeating Marianne Werdel 6–1, 5–7, 6–4 in the final.

## Seeds

* Laura Gildemeister (second round)
* Raffaella Reggi (quarterfinals, retired)
* Claudia Porwik (withdrew)
* Larisa Savchenko (first round)
* Elizabeth Smylie (second round)
* Mercedes Paz (semifinals)
* Wiltrud Probst (semifinals)
* Cathy Caverzasio (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 | Semifinals | Final | Final | Final | Final | Final |
| Q | Anke Huber | 6 | 6 | | | | | | |
| 7 | Wiltrud Probst | 2 | 0 | | | | | | |
| 7 | Wiltrud Probst | 2 | 0 | | Q | Anke Huber | 6 | 5 | 6 |
| | | | | | WC | Marianne Werdel | 1 | 7 | 4 |
| WC | Marianne Werdel | 4 | 7 | 6 | WC | Marianne Werdel | 1 | 7 | 4 |
| 6 | Mercedes Paz | 6 | 5 | 3 | | | | | |

### Top half

| 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 |
| 1 | L Gildemeister | 6 | 6 | | | | | | | | | | | | | | | |
| | N Herreman | 4 | 1 | | 1 | L Gildemeister | 3 | 1 | | | | | | | | | | |
| | K Quentrec | 6 | 6$^3$ | 0 | Q | A Huber | 6 | 6 | | | | | | | | | | |
| Q | A Huber | 2 | 7$^7$ | 6 | | | | | | Q | A Huber | 4 | 7$^8$ | 2 | | | | |
| | S Hanika | 6 | 6 | | | | | | | | S Hanika | 6 | 6$^6$ | 2$^r$ | | | | |
| | C Dahlman | 3 | 3 | | | S Hanika | 6 | 3 | 6 | | | | | | | | | |
| | R McQuillan | 4 | 0 | | 5 | E Smylie | 2 | 6 | 4 | | | | | | | | | |
| 5 | E Smylie | 6 | 6 | | | | | | | | | | | | Q | A Huber | 6 | 6 |
| LL | C Toleafoa | 0 | 6 | 4 | | | | | | | | | | | 7 | W Probst | 2 | 0 |
| | A Dechaume | 6 | 4 | 6 | | A Dechaume | 7$^7$ | 3 | 7 | | | | | | | | | |
| | J Pospíšilová | 1 | 3 | | | M Strandlund | 6$^2$ | 6 | 5 | | | | | | | | | |
| | M Strandlund | 6 | 6 | | | | | | | | A Dechaume | 3 | 7 | 1 | | | | |
| Q | B Fulco | 6 | 6 | | | | | | | 7 | W Probst | 6 | 5 | 6 | | | | |
| | T Phelps | 2 | 3 | | Q | B Fulco | 4 | 5 | | | | | | | | | | |
| | A Coetzer | 6$^4$ | 1 | | 7 | W Probst | 6 | 7 | | | | | | | | | | |
| 7 | W Probst | 7$^7$ | 6 | | | | | | | | | | | | | | | |

### Bottom half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 8 | C Caverzasio | 7$^7$ | 6 | | | | | | | | | | | | | | | |
| | N Medvedeva | 6$^4$ | 2 | | 8 | C Caverzasio | 1 | 6$^5$ | | | | | | | | | | |
| | E Reinach | 6 | 6 | | | E Reinach | 6 | 7$^7$ | | | | | | | | | | |
| Q | A Nishiya | 2 | 2 | | | | | | | E Reinach | 7 | 4 | 4 | | | | | |
| | L Ferrando | 6 | 3 | 7$^7$ | | | | | WC | M Werdel | 5 | 6 | 6 | | | | | |
| | F Labat | 4 | 6 | 6$^3$ | | L Ferrando | 4 | 4 | | | | | | | | | | |
| WC | M Werdel | 6 | 5 | 6 | WC | M Werdel | 6 | 6 | | | | | | | | | | |
| 4 | L Savchenko | 4 | 7 | 3 | | | | | | | | | | WC | M Werdel | 4 | 7 | 6 |
| 6 | M Paz | 6 | 7 | | | | | | | | | | | 6 | M Paz | 6 | 5 | 3 |
| | K Date | 1 | 5 | | 6 | M Paz | 6 | 6 | | | | | | | | | | |
| | B Bowes | 5 | 4 | | Q | A Kijimuta | 1 | 4 | | | | | | | | | | |
| Q | A Kijimuta | 7 | 6 | | | | | | 6 | M Paz | 6 | 4 | | | | | | |
| WC | ML Reynares | 0 | 1 | | | | | | 2 | R Reggi | 1 | 0$^r$ | | | | | | |
| | S Hack | 6 | 6 | | | S Hack | 3 | 2 | | | | | | | | | | |
| | S Stafford | 4 | 5 | | 2 | R Reggi | 6 | 6 | | | | | | | | | | |
| 2 | R Reggi | 6 | 7 | | | | | | | | | | | | | | | |