1991 Donnay Indoor Championships – Singles
| Singles | |
|---|---|
| 1991 Donnay Indoor Championships | |
| Champion |
 Guy Forget
|
| Runner-up |
 Andrei Cherkasov
|
| Final score | 6–3, 7–5, 3–6, 7–6 |
Boris Becker was the defending champion, but retired from his semifinals match this year.
Guy Forget won the title, defeating Andrei Cherkasov 6–3, 7–5, 3–6, 7–6 in the final.
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