1990 Mercedes Cup – Singles
| Singles | |
|---|---|
| 1990 Mercedes Cup | |
| Champion | Goran Ivanišević |
| Runner-up | Guillermo Pérez Roldán |
| Score | 6–7(2–7), 6–1, 6–4, 7–6(7–5) |
| Draw | 48 (3WC/5Q) |
| Seeds | 16 |
Martín Jaite was the defending champion, but lost in the second round to Karel Nováček.
Goran Ivanišević won the title by defeating Guillermo Pérez Roldán 6–7(2–7), 6–1, 6–4, 7–6(7–5) in the final.