1989 Monte Carlo Open – Singles
| Singles | |
|---|---|
| 1989 Monte Carlo Open | |
| Champion | Alberto Mancini |
| Runner-up | Boris Becker |
| Score | 7–5, 2–6, 7–6, 7–5 |
| Draw | 48 (6Q / 4WC) |
| Seeds | 16 |
Alberto Mancini won in the final 7–5, 2–6, 7–6, 7–5 against Boris Becker.
Ivan Lendl was the defending champion but did not compete this year.