| Men's Singles | |
|---|---|
| 1990 Canadian Open | |
| 1989 Champion |
|
| Champion |
|
| Runner-up |
|
| Final score | 4–6, 6–3, 7–6 |
Ivan Lendl was the defending champion but he did not compete that year.
Michael Chang won in the final, 4–6, 6–3, 7–6 in the final, against Jay Berger.
A champion seed is indicated in bold text while text in italics indicates the round in which that seed was eliminated. The top eight seeds received a bye into the second round.