Singles matchups, seeds and recorded results by round. Draw information appears as it is published.
Daniel Merida Aguilar won the Croatia Open Umag 2026 men's singles title from a draw of 29 players, beating Damir Dzumhur 6-2 5-7 6-2 in the final.
7 players are seeded in the Croatia Open Umag 2026 men's singles draw, led by No. 1 seed Francisco Cerundolo, and all 7 have been eliminated.
| Seed | Player | Rank | Fate |
|---|---|---|---|
| 1 | Francisco Cerundolo | #27 | Round of 16 |
| 2 | Alejandro Davidovich Fokina | #20 | Quarterfinals |
| 3 | Camilo Ugo Carabelli | #68 | Round of 16 |
| 4 | Damir Dzumhur | #87 | Quarterfinals |
| 5 | Alexander Blockx | #36 | Round of 32 |
| 7 | Camilo Ugo Carabelli | #59 | Quarterfinals |
| 8 | Vit Kopriva | #64 | Round of 32 |
All 12 matchups set so far in the Round of 32 are complete and 4 players received a bye.
All 8 matchups set so far in the Round of 16 are complete.
All 4 matchups set so far in the Quarterfinals are complete.
All 2 matches in the Semifinals are complete.
Daniel Merida Aguilar beat Damir Dzumhur 6-2 5-7 6-2 in the final.