# 1990 Torneo Internazionale Città di Firenze – Singles

Horacio de la Peña was the defending champion, but lost in the second round to Omar Camporese.
Magnus Larsson won the title by defeating Lawson Duncan 6–7, 7–5, 6–0 in the final.

## Seeds

* Guillermo Pérez Roldán (quarterfinals)
* Horst Skoff (first round)
* Alberto Mancini (second round)
* Franco Davín (first round)
* Javier Sánchez (quarterfinals)
* Ronald Agénor (second round)
* Sergi Bruguera (first round)
* Luiz Mattar (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 | Final | Final | Final | Final | Final |
| Q | Magnus Larsson | 6 | 6 | | | | | |
| | Aki Rahunen | 4 | 4 | | | | | |
| | Aki Rahunen | 4 | 4 | Q | Magnus Larsson | 6 | 7 | 6 |
| | | | | | Lawson Duncan | 7 | 5 | 0 |
| | Lawson Duncan | 6 | 6 | | Lawson Duncan | 7 | 5 | 0 |
| | Omar Camporese | 2 | 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 | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 1 | G Pérez Roldán | 4 | 7 | 7 | | | | | | | | | | | | | | |
| LL | C Pioline | 6 | 5 | 6 | 1 | G Pérez Roldán | 6 | 6 | 6 | | | | | | | | | |
| | U Riglewski | 6 | 6 | | | U Riglewski | 7 | 1 | 4 | | | | | | | | | |
| | T Tulasne | 1 | 1 | | | | | | | 1 | G Pérez Roldán | 5 | 4 | | | | | |
| | JF Altur | 6 | 2 | 6 | | | | | | Q | M Larsson | 7 | 6 | | | | | |
| | M Koevermans | 4 | 6 | 7 | | M Koevermans | 6 | 3 | 6 | | | | | | | | | |
| Q | M Larsson | 6 | 6 | | Q | M Larsson | 3 | 6 | 7 | | | | | | | | | |
| 8 | L Mattar | 3 | 2 | | | | | | | | | | | | Q | M Larsson | 6 | 6 |
| 3/WC | A Mancini | 6 | 7 | | | | | | | | | | | | | A Rahunen | 4 | 4 |
| Q | M Górriz | 2 | 6 | | 3/WC | A Mancini | 6 | 2 | 3 | | | | | | | | | |
| | C Motta | 4 | 5 | | | A Rahunen | 2 | 6 | 6 | | | | | | | | | |
| | A Rahunen | 6 | 7 | | | | | | | | A Rahunen | 6 | 4 | 7 | | | | |
| Q | F Clavet | 6 | 7 | | | | | | | 5 | J Sánchez | 4 | 6 | 5 | | | | |
| | B Orešar | 1 | 6 | | Q | F Clavet | 6 | 0 | | | | | | | | | | |
| | R Azar | 1 | 6 | 1 | 5 | J Sánchez | 7 | 6 | | | | | | | | | | |
| 5 | J Sánchez | 6 | 3 | 6 | | | | | | | | | | | | | | |

### Bottom half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals |
| 6/WC | R Agénor | 7 | 7 | | | | | | | | | | | |
| | A Cherkasov | 6 | 6 | | 6/WC | R Agénor | 3 | 0 | | | | | | |
| | T Carbonell | 6 | 6 | | | T Carbonell | 6 | 6 | | | | | | |
| | A Sznajder | 2 | 2 | | | | | | T Carbonell | 5 | 3 | | | |
| | D Pérez | 6 | 5 | 6 | | | | | L Duncan | 7 | 6 | | | |
| | C Pistolesi | 2 | 7 | 2 | | D Pérez | 3 | 1 | | | | | | |
| | L Duncan | 2 | 7 | 6 | | L Duncan | 6 | 6 | | | | | | |
| 4 | F Davín | 6 | 6 | 2 | | | | | | | | L Duncan | 6 | 6 |
| 7/WC | S Bruguera | 5 | 4 | | | | | | | | | O Camporese | 2 | 3 |
| | F Luna | 7 | 6 | | | F Luna | 6 | 6 | | | | | | |
| | T Benhabiles | 4 | 3 | | | E Bengoechea | 1 | 1 | | | | | | |
| | E Bengoechea | 6 | 6 | | | | | | F Luna | 1 | 6 | | | |
| Q | H de la Peña | 7 | 6 | | | | | | O Camporese | 6 | 7 | | | |
| | M Wostenholme | 6 | 1 | | Q | H de la Peña | 3 | 4 | | | | | | |
| | O Camporese | 6 | 6 | | | O Camporese | 6 | 6 | | | | | | |
| 2 | H Skoff | 2 | 0 | | | | | | | | | | | |