| Singles | |
|---|---|
| 1988 Geneva Open | |
| Champion |  Marián Vajda |
| Runner-up |  Kent Carlsson |
| Score | 6–4, 6–4 |
| Draw | 32 |
| Seeds | 8 |
Claudio Mezzadri was the defending champion, but lost in the second round this year.
Marián Vajda won the title, defeating Kent Carlsson 6–4, 6–4 in the final.
Kent Carlsson (final)
Guillermo Pérez Roldán (first round)
Jordi Arrese (quarterfinals) Magnus Gustafsson (first round)
Claudio Mezzadri (second round) Tomáš Šmíd (first round) Fernando Luna (quarterfinals)
Bruno Orešar (second round)| Semifinals | Final | ||||||||||||
| 1 | Kent Carlsson | 6 | 6 | ||||||||||
| Horacio de la Peña | 2 | 2 | |||||||||||
| 1 | Kent Carlsson | 4 | 4 | ||||||||||
| Marián Vajda | 6 | 6 | |||||||||||
| Eduardo Bengoechea | 5 | 1 | |||||||||||
| Marián Vajda | 7 | 6 | |||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | K Carlsson | 6 | 6 | ||||||||||||||||||||||||
| Q | R Båthman | 1 | 3 | 1 | K Carlsson | 6 | 1 | 6 | |||||||||||||||||||
 D Pérez | 6 | 6 | 4 | WC | R Stadler | 2 | 6 | 0 | |||||||||||||||||||
| WC | R Stadler | 4 | 7 | 6 | 1 | K Carlsson | 6 | 6 | |||||||||||||||||||
| WC | M Rosset | 6 | 2 | 2 | 7 | F Luna | 1 | 2 | |||||||||||||||||||
 T Meinecke | 1 | 6 | 6 | T Meinecke | 6 | 2 | |||||||||||||||||||||
| WC | A Thoms | 3 | 1 | 7 | F Luna | 7 | 6 | ||||||||||||||||||||
| 7 | F Luna | 6 | 6 | 1 | K Carlsson | 6 | 6 | ||||||||||||||||||||
| 4 | M Gustafsson | 4 | 4 | H de la Peña | 2 | 2 | |||||||||||||||||||||
| C Bergström | 6 | 6 | C Bergström | 6 | 6 | ||||||||||||||||||||||
| Q | I Flego | 6 | 6 | 7 | Q | I Flego | 2 | 2 | |||||||||||||||||||
| Q |  Z Kuhárszky | 7 | 4 | 6 | C Bergström | 2 | 5 | ||||||||||||||||||||
| Q |  M Koevermans | 7 | 4 | 6 | H de la Peña | 6 | 7 | ||||||||||||||||||||
| H de la Peña | 6 | 6 | 7 | H de la Peña | 7 | 6 | |||||||||||||||||||||
| J Gunnarsson | 7 | 6 | J Gunnarsson | 6 | 2 | ||||||||||||||||||||||
| 6 | T Šmíd | 6 | 4 | ||||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 5 | C Mezzadri | 6 | 6 | ||||||||||||||||||||||||
 E Masso | 4 | 2 | 5 | C Mezzadri | 2 | 2 | |||||||||||||||||||||
| E Bengoechea | 6 | 6 | E Bengoechea | 6 | 6 | ||||||||||||||||||||||
| J Aguilera | 1 | 1 | E Bengoechea | 6 | 6 | ||||||||||||||||||||||
| A Tous | 6 | 3 | 4 | 3 | J Arrese | 1 | 2 | ||||||||||||||||||||
| J Colas | 2 | 6 | 6 | J Colas | 1 | 3 | |||||||||||||||||||||
 F Segărceanu | 6 | 1 | 3 | J Arrese | 6 | 6 | |||||||||||||||||||||
| 3 | J Arrese | 7 | 6 | E Bengoechea | 5 | 1 | |||||||||||||||||||||
| 8 | B Orešar | 7 | 6 | M Vajda | 7 | 6 | |||||||||||||||||||||
 S Guy | 6 | 1 | 8 | B Orešar | 6 | 2 | 4 | ||||||||||||||||||||
 J Potier | 6 | 6 | 5 |  P Rebolledo | 1 | 6 | 6 | ||||||||||||||||||||
| P Rebolledo | 2 | 7 | 7 | P Rebolledo | 3 | 2 | |||||||||||||||||||||
 P Arraya | 6 | 6 | 6 | M Vajda | 6 | 6 | |||||||||||||||||||||
 C Motta | 7 | 0 | 1 | P Arraya | 6 | 3 | 3 | ||||||||||||||||||||
| M Vajda | 6 | 6 | 6 | M Vajda | 3 | 6 | 6 | ||||||||||||||||||||
| 2 | G Pérez Roldán | 4 | 7 | 3 | |||||||||||||||||||||||
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