1989 Monte Carlo Open – Singles
| Singles | |
|---|---|
|
1989 Monte Carlo Open |
|
| 1988 Champion |
 Ivan Lendl
|
| Champion |
 Alberto Mancini
|
| Runner-up |
 Boris Becker
|
| Final score | 7–5, 2–6, 7–6, 7–5 |
1989 Monte Carlo Open
and the 24–30 April
Ivan Lendl was the defending champion but did not compete that year.
Alberto Mancini won in the final 7–5, 2–6, 7–6, 7–5 against Boris Becker.
A champion seed is indicated in bold text while text in italics indicates the round in which that seed was eliminated. All sixteen seeds received a bye to the second round.
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