Stadium: Court 4 Round: 25 Ground: Clay
| ITF - M15 Brcko | 2021/05/21 11:20 | Dubrivnyy, Artem v Domagoj Biljesko | 6-4,7-6 |
| ITF - M15 Brcko | 2021/05/18 14:00 | Domagoj Biljesko v Maikel De Boes | 6-3,7-5 |
| Sibenik, Singles M-ITF-CRO-05A | 2021/04/20 08:00 | Domagoj Biljesko v Christian Sigsgaard | 6-1,6-7,4-10 |
| Sibenik, Singles M-ITF-CRO-05A | 2021/04/19 09:15 | Domagoj Biljesko v Luka Mikrut | 6-4,7-5 |
| Sibenik, Singles M-ITF-CRO-05A | 2021/04/18 10:00 | Domagoj Biljesko v Samosi, Peter | 6-2,6-2 |
| ITF - M15 Opatija | 2021/03/23 09:00 | Spec, Matic 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 Cornea, Vlad Victor | 3-6,7-5,5-10 |
| ITF - M25 Kiseljak | 2021/05/25 08:00 | Heger, Tim v Marino Jakic | 6-3,6-7,10-1 |
| ITF - M25 Kiseljak | 2021/05/24 08:00 | Heger, Tim v Puljic, Luka | 6-4,6-3 |
| ITF - M25 Kiseljak | 2021/05/23 08:15 | Heger, Tim v Hoogland, Joris | 7-6,6-4 |
| ITF - M15 Brcko | 2021/05/18 14:40 | Dubrivnyy, Artem v Heger, Tim | 6-3,6-1 |
| ITF - M15 Prijedor | 2021/05/12 10:30 | Joao Lucas Reis da Silva v Heger, Tim | 6-3,7-5 |
| ITF - M15 Prijedor | 2021/05/11 09:30 | Rogic Hadzalic, Alen v Heger, Tim | 6-3,4-6,7-10 |
| ITF - M15 Prijedor | 2021/05/10 13:30 | Nicolas Zanellato v Heger, Tim | 6-4,3-6,7-10 |
| ITF - M15 Prijedor | 2021/05/09 12:30 | Tadija Radovanovic v Heger, Tim | 3-6,3-6 |