1990 Monte Carlo Open – Singles
| Singles | |
|---|---|
| 1990 Monte Carlo Open | |
| Champion |
 Andrei Chesnokov
|
| Runner-up |
 Thomas Muster
|
| Final score | 7–5, 6–3, 6–3 |
Alberto Mancini was the defending champion, but lost in the second round this year.
Andrei Chesnokov won the title, defeating Thomas Muster 7–5, 6–3, 6–3 in the final.
The top eight seeds received a bye to the second round.
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