Stadium: Court 3 Opatija Round: 62 Ground: Clay
| ITF M15 Opatija | 2021/03/22 11:55 | Matic Spec v Lucas Bouquet | 6-1,6-1 |
| ITF M15 Opatija | 2021/03/21 11:00 | Matic Spec v Federico Marchetti | 7-5,6-0 |
| ITF M15 Rovinj | 2021/03/14 08:30 | Matic Spec v Duje Kekez | 3-6,4-6 |
| ITF M15 Sharm El Sheikh | 2021/03/03 13:50 | Roman Andres Burruchaga v Matic Spec | 6-2,6-2 |
| ITF M15 Sharm El Sheikh | 2021/03/02 07:30 | Matic Spec v Francesco Passaro | 6-7,6-3,11-9 |
| ITF M15 Sharm El Sheikh | 2021/03/01 13:00 | Matic Spec v Noel Larwig | 6-3,6-2 |
| ITF M15 Sharm El Sheikh | 2021/02/28 17:00 | Matic Spec v Danyil Chornous | 6-1,6-0 |
| ITF M15 Sharm El Sheikh | 2021/02/24 07:30 | George Loffhagen v Matic Spec | 6-3,6-1 |
| 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 Heraklion | 2020/11/16 07:30 | Domagoj Biljesko v Tomas Krcma | 6-0,6-1 |
| ITF M15 Heraklion | 2020/11/08 08:30 | Domagoj Biljesko v Stuart Parker | 3-6,2-6 |