1991 U.S. Pro Indoor – Singles
| Singles | |
|---|---|
| 1991 U.S. Pro Indoor | |
| Champion |
 Ivan Lendl
|
| Runner-up |
 Pete Sampras
|
| Final score | 5–7, 6–4, 6–4, 3–6, 6–3 |
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.
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