1991 Italian Open – Men's singles

Men's singles
1991 Italian Open
Champion Emilio Sánchez
Runner-up Alberto Mancini
Score6–3, 6–1, 3–0 ret.
Draw64
Seeds16

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.