2025 Croatia Open Umag – Singles
| Singles | |
|---|---|
| 2025 Croatia Open Umag | |
| Champion | Luciano Darderi |
| Runner-up | Carlos Taberner |
| Score | 6−3, 6−3 |
| Draw | 28 (4Q / 3WC) |
| Seeds | 8 |
Luciano Darderi defeated Carlos Taberner in the final, 6–3, 6–3 to win the singles tennis title at the 2025 Croatia Open Umag. It was his fourth career ATP Tour title and his second consecutive title in as many weeks, having won the previous week in Båstad.
Francisco Cerúndolo was the defending champion, but lost in the second round to Taberner.