1990 Norstar Bank Hamlet Challenge Cup – Singles
| Singles | |
|---|---|
| 1990 Norstar Bank Hamlet Challenge Cup | |
| Champion |
 Stefan Edberg
|
| Runner-up |
 Goran Ivanišević
|
| Final score | 7–6, 6–3 |
Ivan Lendl was the defending champion (the previous year was an exhibition), but chose not to participate that year.
Stefan Edberg won in the final 7–6, 6–3, against Goran Ivanišević.
The top four seeds receive a bye into the second round.
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