| Singles | |
|---|---|
| 2015 PBZ Zagreb Indoors | |
| Champion |
|
| Runner-up |
|
| Final score | 7–6(7–4), 6–3 |
Marin Čilić was the two-time defending champion, but withdrew before the tournament started due to an arm injury.
Guillermo García-López won the title, defeating Andreas Seppi in the final, 7–6(7–4), 6–3.