Stadium: Court 1 Round: 26 Ground: Clay
| ITF - M15 Brčko | 2021/05/18 14:40 | Artem Dubrivnyy v Tim Heger | 6-3,6-1 |
| ITF - M15 Prijedor | 2021/05/11 11:55 | Gergely Madarasz v Artem Dubrivnyy | 7-6,7-6 |
| ITF M15 - Sint-Petersburg | 2021/04/09 08:00 | Alexander Cozbinov v Artem Dubrivnyy | 6-4,6-7,6-3 |
| ITF M15 - Sint-Petersburg | 2021/04/08 07:00 | Maxim Ratniuk v Artem Dubrivnyy | 2-6,1-6 |
| ITF M15 - Sint-Petersburg | 2021/04/06 07:00 | Jakub Paul v Artem Dubrivnyy | 5-7,1-6 |
| Challenger St. Petersburg | 2021/03/06 09:00 | Altug Celikbilek v Artem Dubrivnyy | 5-7,6-2,6-3 |
| Challenger St. Petersburg | 2021/03/05 08:00 | Artem Dubrivnyy v Andrey Kuznetsov | 6-3,6-7,6-3 |
| Challenger St. Petersburg | 2021/03/03 12:15 | Viktor Durasovic v Artem Dubrivnyy | 5-7,6-3,3-6 |
| ITF - M15 Brčko | 2021/05/18 14:00 | Domagoj Biljesko v Maikel De Boes | 6-3,7-5 |
| ITF M15 - Šibenik | 2021/04/20 08:00 | Domagoj Biljesko v Christian Sigsgaard | 6-1,6-7,4-10 |
| ITF M15 - Šibenik | 2021/04/19 09:15 | Domagoj Biljesko v Luka Mikrut | 6-4,7-5 |
| ITF M15 - Šibenik | 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 Poreč | 2021/03/08 14:00 | Mauro De Maio v Domagoj Biljesko | 6-3,7-6 |