1991 Monte Carlo Open – Singles
| Singles | |
|---|---|
| 1991 Monte Carlo Open | |
| Champion |
 Sergi Bruguera
|
| Runner-up |
 Boris Becker
|
| Final score | 5–7, 6–4, 7–6(8–6), 7–6(7–4) |
| Seeds | 16 |
Andrei Chesnokov was the defending champion, but lost to Boris Becker in the quarterfinals.
Sergi Bruguera defeated Boris Becker 5–7, 6–4, 7–6(8–6), 7–6(7–4) in the final.
The top eight seeds received a bye to the second round.
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