| Women's singles | |
|---|---|
| 1990 OTB International Open | |
| Champion |  Anke Huber |
| Runner-up |  Marianne Werdel |
| Score | 6–1, 5–7, 6–4 |
| Draw | 32 (2WC/4Q/1LL) |
| Seeds | 8 |
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. [1] [2]
Laura Gildemeister (second round)
Raffaella Reggi (quarterfinals, retired) 
Larisa Savchenko (first round)
Elizabeth Smylie (second round)
Mercedes Paz (semifinals) Wiltrud Probst (semifinals)
Cathy Caverzasio (second round)| Semifinals | Final | ||||||||||||
| Q | Anke Huber | 6 | 6 | ||||||||||
| 7 | Wiltrud Probst | 2 | 0 | ||||||||||
| Q | Anke Huber | 6 | 5 | 6 | |||||||||
| WC | Marianne Werdel | 1 | 7 | 4 | |||||||||
| WC | Marianne Werdel | 4 | 7 | 6 | |||||||||
| 6 | Mercedes Paz | 6 | 5 | 3 | |||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | L Gildemeister | 6 | 6 | ||||||||||||||||||||||||
 N Herreman | 4 | 1 | 1 | L Gildemeister | 3 | 1 | |||||||||||||||||||||
| K Quentrec | 6 | 63 | 0 | Q | A Huber | 6 | 6 | ||||||||||||||||||||
| Q | A Huber | 2 | 77 | 6 | Q | A Huber | 4 | 78 | 2 | ||||||||||||||||||
| S Hanika | 6 | 6 | S Hanika | 6 | 66 | 2r | |||||||||||||||||||||
 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 | 77 | 3 | 7 | ||||||||||||||||||||
 J Pospíšilová | 1 | 3 | M Strandlund | 62 | 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 | 64 | 1 | 7 | W Probst | 6 | 7 | |||||||||||||||||||||
| 7 | W Probst | 77 | 6 | ||||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 8 | C Caverzasio | 77 | 6 | ||||||||||||||||||||||||
| N Medvedeva | 64 | 2 | 8 | C Caverzasio | 1 | 65 | |||||||||||||||||||||
| E Reinach | 6 | 6 | E Reinach | 6 | 77 | ||||||||||||||||||||||
| Q |  A Nishiya | 2 | 2 | E Reinach | 7 | 4 | 4 | ||||||||||||||||||||
| L Ferrando | 6 | 3 | 77 | WC | M Werdel | 5 | 6 | 6 | |||||||||||||||||||
| F Labat | 4 | 6 | 63 | 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 | 0r | ||||||||||||||||||||
| S Hack | 6 | 6 | S Hack | 3 | 2 | ||||||||||||||||||||||
| S Stafford | 4 | 5 | 2 | R Reggi | 6 | 6 | |||||||||||||||||||||
| 2 | R Reggi | 6 | 7 | ||||||||||||||||||||||||
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