1991 Italian Open – Men's singles
| Men's singles | |
|---|---|
| 1991 Italian Open | |
| Champion | Emilio Sánchez |
| Runner-up | Alberto Mancini |
| Score | 6–3, 6–1, 3–0 ret. |
| Draw | 64 |
| Seeds | 16 |
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.