# 1991 Italian Open – Men's singles

Emilio Sánchez won the men's singles tennis title at the 1991 Italian Open after Alberto Mancini retired from the final, with the scoreline at 6–3, 6–1, 3–0.
Thomas Muster was the defending champion, but lost to Goran Prpić in the third round.

## Seeds

* Boris Becker (withdrew)
* Andre Agassi (first round)
* Pete Sampras (second round)
* Goran Ivanišević (first round)
* Sergi Bruguera (semifinals)
* Jim Courier (third round)
* Jonas Svensson (second round)
* Brad Gilbert (first round)
* Emilio Sánchez (champion)
* Michael Stich (first round)
* Andrei Cherkasov (quarterfinals)
* Guillermo Pérez Roldán (first round)
* Jakob Hlasek (second round)
* Magnus Gustafsson (second round)
* Alexander Volkov (second round)
* Karel Nováček (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

| Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final | Final | Final | |
| | Richard Fromberg | 2 | 2 | | | | | | | | | | | |
| 9 | Emilio Sánchez | 6 | 6 | | | | | | | | | | | |
| 9 | Emilio Sánchez | 6 | 6 | 9 | Emilio Sánchez | 6 | 6 | | | | | | | |
| | | | | | Goran Prpić | 4 | 2 | | | | | | | |
| | Goran Prpić | 7$^7$ | 7 | | Goran Prpić | 4 | 2 | | | | | | | |
| 11 | Andrei Cherkasov | 6$^3$ | 5 | | | | | | | | | | | |
| 11 | Andrei Cherkasov | 6$^3$ | 5 | | | | | 9 | Emilio Sánchez | 6 | 6 | 3 | | |
| | | | | | | | | Q | Alberto Mancini | 3 | 1 | 0$^r$ | | |
| 5 | Sergi Bruguera | 6 | 7$^7$ | | | | | | | | | | Q | Alberto Mancini | 3 | 1 | 0$^r$ |
| | Fabrice Santoro | 4 | 6$^1$ | | | | | | | | | | | |
| | Fabrice Santoro | 4 | 6$^1$ | 5 | Sergi Bruguera | 3 | 1 | | | | | | | |
| | | | | Q | Alberto Mancini | 6 | 6 | | | | | | | |
| Q | Alberto Mancini | 6 | 6 | Q | Alberto Mancini | 6 | 6 | | | | | | | |
| | Horacio de la Peña | 4 | 2 | | | | | | | | | | | |

### Section 1

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| LL | C Pioline | 7 | 6 | | | | | | | | | | | | | |
| | M Rosset | 5 | 3 | | LL | C Pioline | 4 | 5 | | | | | | | | |
| | M Jaite | 6 | 5 | 6$^4$ | | C Caratti | 6 | 7 | | | | | | | | |
| | C Caratti | 4 | 7 | 7$^7$ | | | | | | C Caratti | 5 | 0 | | | | |
| | R Fromberg | 4 | 7$^7$ | 6 | | | | | | R Fromberg | 7 | 6 | | | | |
| | P McEnroe | 6 | 6$^5$ | 2 | | R Fromberg | 7 | 6 | | | | | | | | |
| | J Siemerink | 7$^7$ | 3 | 2 | 15 | A Volkov | 5 | 3 | | | | | | | | |
| 15 | A Volkov | 6$^3$ | 6 | 6 | | | | | | | | | | R Fromberg | 2 | 2 |
| 9 | E Sánchez | 6 | 6 | | | | | | | | | | 9 | E Sánchez | 6 | 6 |
| | T Woodbridge | 1 | 1 | | 9 | E Sánchez | 6 | 6 | | | | | | | | |
| | H Skoff | 6 | 6 | | | H Skoff | 4 | 3 | | | | | | | | |
| | L Mattar | 1 | 1 | | | | | | 9 | E Sánchez | 6 | 6 | | | | |
| Q | W Ferreira | 6 | 2 | 6 | | | | | Q | W Ferreira | 2 | 2 | | | | |
| | T Carbonell | 4 | 6 | 4 | Q | W Ferreira | 7$^7$ | 6 | | | | | | | | |
| | M Woodforde | 3 | 6 | 6 | | M Woodforde | 6$^2$ | 4 | | | | | | | | |
| 8 | B Gilbert | 6 | 2 | 4 | | | | | | | | | | | | |

### Section 2

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| 4 | G Ivanišević | 6 | 5 | 3 | | | | | | | | | | | | | | |
| | P Haarhuis | 3 | 7 | 6 | | P Haarhuis | 4 | 2 | | | | | | | | | | |
| | T Muster | 6 | 6 | | | T Muster | 6 | 6 | | | | | | | | | | |
| | A Mansdorf | 4 | 2 | | | | | | | | T Muster | 6 | 3 | 2 | | | | |
| | M Filippini | 0 | 6 | 1 | | | | | | | G Prpić | 3 | 6 | 6 | | | | |
| | G Prpić | 6 | 2 | 6 | | G Prpić | 6 | 7 | | | | | | | | | | |
| WC | P Canè | 6 | 2 | 4 | 13 | J Hlasek | 1 | 5 | | | | | | | | | | |
| 13 | J Hlasek | 3 | 6 | 6 | | | | | | | | | | | | G Prpić | 7$^7$ | 7 |
| 11 | A Cherkasov | 6 | 6 | | | | | | | | | | | | 11 | A Cherkasov | 6$^3$ | 5 |
| | A Antonitsch | 2 | 4 | | 11 | A Cherkasov | 6$^3$ | 6 | 7$^7$ | | | | | | | | | |
| WC | S Pescosolido | 6 | 6 | | WC | S Pescosolido | 7$^7$ | 2 | 6$^4$ | | | | | | | | | |
| Q | R Krajicek | 1 | 2 | | | | | | | 11 | A Cherkasov | 4 | 6 | 6 | | | | |
| | O Camporese | 5 | 6 | 4 | | | | | | 6 | J Courier | 6 | 1 | 2 | | | | |
| | N Kulti | 7 | 4 | 6 | | N Kulti | 0 | 3 | | | | | | | | | | |
| | J Arrese | 4 | 6 | 3 | 6 | J Courier | 6 | 6 | | | | | | | | | | |
| 6 | J Courier | 6 | 4 | 6 | | | | | | | | | | | | | | |

### Section 3

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| 5 | S Bruguera | 3 | 6 | 7$^7$ | | | | | | | | | | | | | | |
| Q | C Costa | 6 | 2 | 6$^5$ | 5 | S Bruguera | 6 | 6 | | | | | | | | | | |
| WC | Y Noah | 6 | 6 | | WC | Y Noah | 1 | 3 | | | | | | | | | | |
| | A Mronz | 1 | 3 | | | | | | | 5 | S Bruguera | 6 | 6 | | | | | |
| WC | C Pistolesi | 6 | 6$^5$ | 6$^4$ | | | | | | Q | C Miniussi | 1 | 2 | | | | | |
| | A Krickstein | 4 | 7$^7$ | 7$^7$ | | A Krickstein | 2 | 4 | | | | | | | | | | |
| Q | C Miniussi | 6$^6$ | 6 | 6 | Q | C Miniussi | 6 | 6 | | | | | | | | | | |
| 12 | G Pérez Roldán | 7$^8$ | 4 | 1 | | | | | | | | | | | 5 | S Bruguera | 6 | 7$^7$ |
| 14 | M Gustafsson | 7$^8$ | 6 | | | | | | | | | | | | | F Santoro | 4 | 6$^1$ |
| | M Wilander | 6$^6$ | 1 | | 14 | M Gustafsson | 0 | 3 | | | | | | | | | | |
| | H Leconte | 6 | 4 | 6 | | H Leconte | 6 | 6 | | | | | | | | | | |
| Q | F Fontang | 2 | 6 | 2 | | | | | | | H Leconte | 4 | 7 | 6$^5$ | | | | |
| | F Santoro | 6 | 6 | | | | | | | | F Santoro | 6 | 5 | 7$^7$ | | | | |
| | M Larsson | 4 | 1 | | | F Santoro | 6 | 4 | 7 | | | | | | | | | |
| Q | V Gabrichidze | 6$^2$ | 6 | 2 | 3 | P Sampras | 2 | 6 | 5 | | | | | | | | | |
| 3 | P Sampras | 7$^7$ | 4 | 6 | | | | | | | | | | | | | | |

### Section 4

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| 7 | J Svensson | 6 | 3 | 6 | | | | | | | | | | | | | | |
| | F Davín | 4 | 6 | 4 | 7 | J Svensson | 6 | 5 | 5 | | | | | | | | | |
| | R Agénor | 4 | 4 | | Q | A Mancini | 4 | 7 | 7 | | | | | | | | | |
| Q | A Mancini | 6 | 6 | | | | | | | Q | A Mancini | 6 | 4 | 7$^7$ | | | | |
| | P Cash | 6 | 4 | 1 | | | | | | | M Koevermans | 0 | 6 | 6$^1$ | | | | |
| | J Aguilera | 3 | 6 | 6 | | J Aguilera | 2 | 2 | | | | | | | | | | |
| | M Koevermans | 4 | 6 | 6 | | M Koevermans | 6 | 6 | | | | | | | | | | |
| 10 | M Stich | 6 | 4 | 4 | | | | | | | | | | | Q | A Mancini | 6 | 6 |
| 16 | K Nováček | 0 | 3 | | | | | | | | | | | | | H de la Peña | 4 | 2 |
| Q | M Cierro | 6 | 6 | | Q | M Cierro | 5 | 1 | | | | | | | | | | |
| | P Lundgren | 2 | 2 | | | H de la Peña | 7 | 6 | | | | | | | | | | |
| | H de la Peña | 6 | 6 | | | | | | | | H de la Peña | 7$^7$ | 6 | | | | | |
| | R Furlan | 6 | 6 | | | | | | | | E Jelen | 6$^2$ | 1 | | | | | |
| | J Yzaga | 4 | 0 | | | R Furlan | 6 | 3 | 6$^6$ | | | | | | | | | |
| | E Jelen | 6 | 7$^9$ | | | E Jelen | 2 | 6 | 7$^8$ | | | | | | | | | |
| 2 | A Agassi | 3 | 6$^7$ | | | | | | | | | | | | | | | |