# 1989 Campionati Internazionali di Sicilia – Singles

Mats Wilander was the defending champion, but did not compete this year.
Guillermo Pérez Roldán won the title by defeating Paolo Canè 6–1, 6–4 in the final.

## Seeds

* Alberto Mancini (quarterfinals)
* Martín Jaite (first round)
* Thomas Muster (first round)
* Paolo Canè (final)
* Sergi Bruguera (quarterfinals)
* Andrés Gómez (first round)
* Guillermo Pérez Roldán (champion)
* Goran Ivanišević (semifinals)

## 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 |
| 8 | Goran Ivanišević | 4 | 3 | | | | | |
| 4 | Paolo Canè | 6 | 6 | | | | | |
| 4 | Paolo Canè | 6 | 6 | | 4 | Paolo Canè | 1 | 4 |
| | | | | | 7 | Guillermo Pérez Roldán | 6 | 6 |
| Q | Pavel Vojtíšek | 6 | 4 | 1 | 7 | Guillermo Pérez Roldán | 6 | 6 |
| 7 | Guillermo Pérez Roldán | 4 | 6 | 6 | | | | |

### 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 | A Mancini | 6 | 6 | | | | | | | | | | | | | | | |
| | C Costa | 2 | 1 | | 1 | A Mancini | 6 | 6 | | | | | | | | | | |
| | S Lochbihler | 6 | 6 | | | S Lochbihler | 4 | 0 | | | | | | | | | | |
| | F Cancellotti | 4 | 4 | | | | | | | 1 | A Mancini | 6 | 5 | 4 | | | | |
| | S Colombo | 6 | 6 | | | | | | | 8 | G Ivanišević | 3 | 7 | 6 | | | | |
| | M Cierro | 2 | 1 | | | S Colombo | 4 | 6 | | | | | | | | | | |
| WC | J Myström | 1 | 6 | 0 | 8 | G Ivanišević | 6 | 7 | | | | | | | | | | |
| 8 | G Ivanišević | 6 | 4 | 6 | | | | | | | | | | | 8 | G Ivanišević | 4 | 3 |
| 4 | P Canè | 7 | 6 | | | | | | | | | | | | 4 | P Canè | 6 | 6 |
| | F Roig | 6 | 4 | | 4 | P Canè | 4 | 6 | 6 | | | | | | | | | |
| | G Giussani | 6 | 2 | | | R Osterthun | 6 | 3 | 3 | | | | | | | | | |
| | R Osterthun | 7 | 6 | | | | | | | 4 | P Canè | 6 | 6 | 7 | | | | |
| | R Azar | 6 | 6 | | | | | | | Q | P Ballauff | 7 | 1 | 5 | | | | |
| WC | T Šmíd | 3 | 3 | | | R Azar | 4 | 4 | | | | | | | | | | |
| Q | P Ballauff | 6 | 3 | 6 | Q | P Ballauff | 6 | 6 | | | | | | | | | | |
| 6 | A Gómez | 0 | 6 | 4 | | | | | | | | | | | | | | |

### 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 | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 5 | S Bruguera | 4 | 6 | 6 | | | | | | | | | | | | | | |
| Q | G López | 6 | 3 | 4 | 5 | S Bruguera | 6 | 7 | | | | | | | | | | |
| | A Aramburú | 1 | 1 | | | D Pérez | 3 | 6 | | | | | | | | | | |
| | D Pérez | 6 | 6 | | | | | | | 5 | S Bruguera | 6 | 4 | | | | | |
| | O Camporese | 6 | 5 | 6 | | | | | | Q | P Vojtíšek | 7 | 6 | | | | | |
| | U Riglewski | 3 | 7 | 3 | | O Camporese | 1 | 0 | | | | | | | | | | |
| Q | P Vojtíšek | 6 | 6 | | Q | P Vojtíšek | 6 | 6 | | | | | | | | | | |
| 3 | T Muster | 4 | 1 | | | | | | | | | | | Q | P Vojtíšek | 6 | 4 | 1 |
| 7 | G Pérez Roldán | 7 | 6 | | | | | | | | | | | 7 | G Pérez Roldán | 4 | 6 | 6 |
| | J Čihák | 6 | 2 | | 7 | G Pérez Roldán | 3 | 6 | 6 | | | | | | | | | |
| | D Nargiso | 6 | 6 | | | C Mezzadri | 6 | 3 | 3 | | | | | | | | | |
| | C Mezzadri | 7 | 7 | | | | | | | 7 | G Pérez Roldán | 6 | 6 | | | | | |
| | C Pistolesi | 3 | 6 | 7 | | | | | | | C Pistolesi | 4 | 1 | | | | | |
| | J Wöhrmann | 6 | 3 | 5 | | C Pistolesi | 7 | 6 | | | | | | | | | | |
| Q | S Pescosolido | 6 | 6 | 6 | Q | S Pescosolido | 5 | 3 | | | | | | | | | | |
| 2 | M Jaite | 3 | 7 | 3 | | | | | | | | | | | | | | |