1991 OTB International Open – Singles
| Singles | |
|---|---|
| 1991 OTB International Open | |
| Champion |
 Michael Stich
|
| Runner-up |
 Emilio Sánchez
|
| Final score | 6–2, 6–4 |
Ramesh Krishnan was the defending champion, but lost in the first round this year.
Michael Stich won the tournament, beating Emilio Sánchez in the final, 6–2, 6–4.
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