# 1989 Geneva Open – Singles

Marián Vajda was the defending champion, but did not participate this year.
Marc Rosset won the title, defeating Guillermo Pérez Roldán 6–4, 7–5 in the final.

## Seeds

* Alberto Mancini (first round)
* Sergi Bruguera (first round)
* Andrés Gómez (second round)
* Guillermo Pérez Roldán (final)
* Goran Ivanišević (first round)
* Marcelo Filippini (second round)
* Guy Forget (first round)
* Bruno Orešar (first 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 |
| WC | Marc Rosset | 6 | 3 | 6 | | | | |
| | Eduardo Bengoechea | 2 | 6 | 2 | | | | |
| | Eduardo Bengoechea | 2 | 6 | 2 | WC | Marc Rosset | 6 | 7 |
| | | | | | 4 | Guillermo Pérez Roldán | 4 | 5 |
| 4 | Guillermo Pérez Roldán | 6 | 6 | | 4 | Guillermo Pérez Roldán | 4 | 5 |
| Q | Francisco Yunis | 4 | 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 | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 1 | A Mancini | 7 | 4 | 6 | | | | | | | | | | | | | | |
| Q | X Daufresne | 5 | 6 | 7 | Q | X Daufresne | 6 | 6 | | | | | | | | | | |
| | C Motta | 6 | 6 | | | C Motta | 2 | 4 | | | | | | | | | | |
| | A Võsand | 3 | 4 | | | | | | | Q | X Daufresne | 1 | 2 | | | | | |
| | L Duncan | 7 | 6 | | | | | | | WC | M Rosset | 6 | 6 | | | | | |
| | C Mezzadri | 6 | 1 | | | L Duncan | 2 | 3 | | | | | | | | | | |
| WC | M Rosset | 6 | 6 | | WC | M Rosset | 6 | 6 | | | | | | | | | | |
| 7/WC | G Forget | 2 | 2 | | | | | | | | | | | WC | M Rosset | 6 | 3 | 6 |
| 3 | A Gómez | 6 | 6 | | | | | | | | | | | | E Bengoechea | 2 | 6 | 2 |
| | A Mronz | 1 | 1 | | 3 | A Gómez | 6 | 6 | 5 | | | | | | | | | |
| | E Bengoechea | 7 | 6 | | | E Bengoechea | 7 | 4 | 7 | | | | | | | | | |
| | F Luna | 5 | 4 | | | | | | | | E Bengoechea | 6 | 6 | | | | | |
| | J Brown | 3 | 1 | | | | | | | | L Jönsson | 3 | 2 | | | | | |
| | L Jönsson | 6 | 6 | | | L Jönsson | 6 | 7 | | | | | | | | | | |
| | S Lochbihler | 3 | 1 | | 6 | M Filippini | 3 | 5 | | | | | | | | | | |
| 6 | M Filippini | 6 | 6 | | | | | | | | | | | | | | | |

### Bottom 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 |
| 5 | G Ivanišević | 3 | 6 | | | | | | | | | | | | | | | |
| | J Aguilera | 6 | 7 | | | J Aguilera | 6 | 3 | 6 | | | | | | | | | |
| WC | R Stadler | 6 | 5 | 2 | | U Riglewski | 1 | 6 | 4 | | | | | | | | | |
| | U Riglewski | 4 | 7 | 6 | | | | | | | J Aguilera | 0 | 2 | | | | | |
| | H de la Peña | 6 | 0 | 0 | | | | | | 4 | G Pérez Roldán | 6 | 6 | | | | | |
| | R Argüello | 2 | 6 | 6 | | R Argüello | 6 | 2 | | | | | | | | | | |
| | T Tulasne | 5 | 3 | | 4 | G Pérez Roldán | 7 | 6 | | | | | | | | | | |
| 4 | G Pérez Roldán | 7 | 6 | | | | | | | | | | | | 4 | G Pérez Roldán | 6 | 6 |
| 8 | B Orešar | 2 | 1 | | | | | | | | | | | | Q | F Yunis | 4 | 3 |
| Q | F Yunis | 6 | 6 | | Q | F Yunis | 7 | 6 | | | | | | | | | | |
| | M Ostoja | 6 | 0 | 7 | | M Ostoja | 5 | 3 | | | | | | | | | | |
| Q | G Luza | 3 | 6 | 6 | | | | | | Q | F Yunis | 6 | 1 | 6 | | | | |
| | M Wostenholme | 0 | 6 | 5 | | | | | | Q | S Cortés | 2 | 6 | 3 | | | | |
| Q | S Cortés | 6 | 3 | 7 | Q | S Cortés | 5 | 6 | 6 | | | | | | | | | |
| | C Bergström | 6 | 0 | 6 | | C Bergström | 7 | 2 | 1 | | | | | | | | | |
| 2 | S Bruguera | 3 | 6 | 2 | | | | | | | | | | | | | | |