1991 U.S. Pro Indoor – Singles
| Singles | |
|---|---|
| 1991 U.S. Pro Indoor | |
| Champion | Ivan Lendl |
| Runner-up | Pete Sampras |
| Score | 5–7, 6–4, 6–4, 3–6, 6–3 |
| Draw | 48 |
| Seeds | 16 |
Pete Sampras was the defending champion.
Ivan Lendl won the title, defeating Sampras, 5–7, 6–4, 6–4, 3–6, 6–3 in the final.