Stadium: Court 2 Round: 44 Ground: Clay
| ITF M25 Kiseljak | 2021/05/24 08:00 | Tim Heger v Luka Puljic | 6-4,6-3 |
| ITF M25 Kiseljak | 2021/05/23 08:15 | Tim Heger v Joris Hoogland | 7-6,6-4 |
| ITF M15 Brcko | 2021/05/18 14:40 | Artem Dubrivnyy v Tim Heger | 6-3,6-1 |
| ITF M15 Prijedor | 2021/05/12 10:30 | Joao Lucas Reis da Silva v Tim Heger | 6-3,7-5 |
| ITF M15 Prijedor | 2021/05/11 09:30 | Alen Rogic-Hadzalic v Tim Heger | 6-3,4-6,7-10 |
| ITF M15 Prijedor | 2021/05/10 13:30 | Nicolas Zanellato v Tim Heger | 6-4,3-6,7-10 |
| ITF M15 Prijedor | 2021/05/09 12:30 | Tadija Radovanovic v Tim Heger | 3-6,3-6 |
| ITF M15 Sibenik | 2021/04/21 08:00 | Tim Heger v Marco Miceli | 3-6,4-6 |
| ITF M25 Kiseljak | 2021/05/24 08:00 | Petar Jovic v Marino Jakic | 2-6,1-6 |
| ITF M25 Kiseljak | 2021/05/23 07:00 | Marino Jakic v Antun Vidak | 6-1,6-4 |
| ITF M15 Sibenik | 2021/05/16 07:30 | Marino Jakic v Julien Penzlin | 1-6,4-6 |
| ITF M15 Sibenik | 2021/04/21 13:00 | Marino Jakic v Mili Poljicak | 3-6,3-6 |
| ITF M15 Sibenik | 2021/04/20 09:15 | Petr Hajek v Marino Jakic | 6-4,4-6,1-10 |
| ITF M15 Sibenik | 2021/04/19 09:55 | Marino Jakic v Paul Valsecchi | 6-3,7-6 |
| ITF M15 Porec | 2021/03/07 12:00 | Benedikt Emesz v Marino Jakic | 7-5,6-2 |
| Adriatic Tennis Series | 2020/06/15 09:30 | Marino Jakic v Deni Zmak | 2-6,4-5 |