Stadium: Court 5 Round: 62 Ground: Clay
| ITF M15 Sibenik | 2021/04/18 10:00 | Domagoj Biljesko v Peter Samosi | 6-2,6-2 |
| ITF M15 Opatija | 2021/03/23 09:00 | Matic Spec v Domagoj Biljesko | 7-5,6-2 |
| ITF M15 Opatija | 2021/03/22 11:45 | Tadija Radovanovic v Domagoj Biljesko | 6-7,1-6 |
| ITF M15 Rovinj | 2021/03/15 08:30 | Domagoj Biljesko v Victor Vlad Cornea | 3-6,7-5,5-10 |
| ITF M15 Porec | 2021/03/08 14:00 | Mauro De Maio v Domagoj Biljesko | 6-3,7-6 |
| ITF M15 Porec | 2021/03/07 14:30 | Luka Petrovic v Domagoj Biljesko | 5-7,6-3,8-10 |
| ITF M15 Heraklion | 2020/11/23 10:00 | Billy Harris v Domagoj Biljesko | 6-4,7-6 |
| ITF M15 Heraklion | 2020/11/16 12:00 | Domagoj Biljesko v Valentin Royer | 6-7,4-6 |
| ITF M15 Sibenik | 2021/04/18 10:00 | Nikola Basic v Luka Mikrut | 4-6,6-4,6-10 |
| Challenger Split | 2021/04/04 09:00 | Tung-Lin Wu v Luka Mikrut | 6-2,6-1 |
| Challenger Zadar | 2021/03/21 09:30 | Uladzimir Ignatik v Luka Mikrut | 7-5,6-0 |
| ITF M15 Rovinj | 2021/03/15 08:30 | Luka Mikrut v Maxime Mora | 2-6,3-6 |
| ITF M15 Porec | 2021/03/07 13:00 | Luka Mikrut v Nikola Basic | 5-7,2-6 |
| Adriatic Tennis Series | 2020/06/15 08:00 | Luka Mikrut v Stjepan Anisic | 6-0,6-2 |