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.
Seeds The top four seeds received a bye into the second round.
Draw
Finals
Top half
Bottom half
Qualifying Seeds
Qualifiers
Qualifying draw
First qualifier
Second qualifier
Third qualifier
Fourth qualifier
References
External links Main draw Qualifying draw