1990 ATP German Open – Singles
| Singles | |
|---|---|
| 1990 ATP German Open | |
| Champion | Juan Aguilera |
| Runner-up | Boris Becker |
| Score | 6–1, 6–0, 7–6(9–7) |
| Draw | 56 |
| Seeds | 16 |
Juan Aguilera defeated Boris Becker in the final, 6–1, 6–0, 7–6(9–7) to win the singles tennis title at the 1990 Hamburg European Open.
Ivan Lendl was the reigning champion, but did not compete this year.