# 1989 Vitosha New Otani Open – Singles

Conchita Martínez was the defending champion but did not compete that year.
Isabel Cueto won in the final 6–2, 7–6 against Katerina Maleeva.

## Seeds

A champion seed is indicated in bold text while text in italics indicates the round in which that seed was eliminated.
* Katerina Maleeva (final)
* Isabel Cueto (champion)
* Laura Golarsa (first round)
* Petra Langrová (quarterfinals)
* Laura Garrone (first round)
* Sabrina Goleš (quarterfinals)
* Angeliki Kanellopoulou (semifinals)
* Sabine Hack (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
| 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 | K Maleeva | 6 | 7 | | | | | | | | | | | | | | | | | | | |
| | A Simpkin | 3 | 5 | | 1 | K Maleeva | 6 | 7 | | | | | | | | | | | | | | |
| LL | R Szikszay | 6 | 6 | 7 | LL | R Szikszay | 0 | 5 | | | | | | | | | | | | | | |
| | S Frankl | 4 | 7 | 5 | | | | | | 1 | K Maleeva | 6 | 6 | | | | | | | | | |
| | S Meier | 2 | 6 | 6 | | | | | | | S Meier | 4 | 4 | | | | | | | | | |
| | M-C Damas | 6 | 4 | 1 | | S Meier | 1 | 6 | 6 | | | | | | | | | | | | | |
| | A Dechaume | 6 | 2 | 0 | 8 | S Hack | 6 | 4 | 4 | | | | | | | | | | | | | |
| 8 | S Hack | 0 | 6 | 6 | | | | | | | | | | | 1 | K Maleeva | 6 | 6 | | | | |
| 4 | P Langrová | 7 | 5 | 6 | | | | | | | | | | | | B Romanò | 2 | 3 | | | | |
| | M Grossi | 6 | 7 | 1 | 4 | P Langrová | 7 | 6 | | | | | | | | | | | | | | |
| | F Bonsignori | 7 | 6 | | | F Bonsignori | 6 | 2 | | | | | | | | | | | | | | |
| Q | C Singer | 6 | 2 | | | | | | | 4 | P Langrová | 6 | 2 | 2 | | | | | | | | |
| Q | T Morton | 7 | 3 | 2 | | | | | | | B Romanò | 2 | 6 | 6 | | | | | | | | |
| | L Lásková | 6 | 6 | 6 | | L Lásková | 2 | 2 | | | | | | | | | | | | | | |
| | B Romanò | 6 | 6 | | | B Romanò | 6 | 6 | | | | | | | | | | | | | | |
| 5 | L Garrone | 3 | 0 | | | | | | | | | | | | | | | | 1 | Katerina Maleeva | 2 | 6 |
| 7 | A Kanellopoulou | 6 | 6 | | | | | | | | | | | | | | | | 2 | Isabel Cueto | 6 | 7 |
| Q | M Maruska | 3 | 1 | | 7 | A Kanellopoulou | 6 | 6 | | | | | | | | | | | | | | |
| | S Menning | 3 | 3 | | Q | M Frimmelová | 3 | 3 | | | | | | | | | | | | | | |
| Q | M Frimmelová | 6 | 6 | | | | | | | 7 | A Kanellopoulou | 7 | 6 | | | | | | | | | |
| | M Laval | 6 | 4 | 7 | | | | | | | C Dahlman | 6 | 0 | | | | | | | | | |
| | J Joseph | 2 | 6 | 6 | | M Laval | 5 | 1 | | | | | | | | | | | | | | |
| | C Dahlman | 6 | 6 | | | C Dahlman | 7 | 6 | | | | | | | | | | | | | | |
| 3 | L Golarsa | 0 | 0 | | | | | | | | | | | | 7 | A Kanellopoulou | 5 | 1 | | | | |
| 6 | S Goleš | 6 | 6 | | | | | | | | | | | | 2 | I Cueto | 7 | 6 | | | | |
| | S Krivencheva | 1 | 2 | | 6 | S Goleš | 6 | 6 | | | | | | | | | | | | | | |
| | P Thorén | 1 | 4 | | | I Budařová | 2 | 2 | | | | | | | | | | | | | | |
| | I Budařová | 6 | 6 | | | | | | | 6 | S Goleš | 1 | 5 | | | | | | | | | |
| | K Kschwendt | 1 | 7 | 6 | | | | | | 2 | I Cueto | 6 | 7 | | | | | | | | | |
| | M Ekstrand | 6 | 6 | 1 | | K Kschwendt | 6 | 4 | 0 | | | | | | | | | | | | | |
| | E Pampoulova | 2 | 4 | | 2 | I Cueto | 2 | 6 | 6 | | | | | | | | | | | | | |
| 2 | I Cueto | 6 | 6 | | | | | | | | | | | | | | | | | | | |