| UTR Pro Tennis Series Zadar | 2021/06/30 08:00 | Warren Sinius v Constant De La Bassetiere | 3-6,6-6 |
| UTR Pro Tennis Series Zadar | 2021/06/29 11:00 | Warren Sinius v Frane Nincevic | 5-7,3-6 |
| UTR Pro Tennis Series Zadar | 2021/06/28 12:30 | Warren Sinius v Josip Krstanovic | 2-6,1-5 |
| UTR Pro Tennis Series Copenhagen | 2021/06/20 08:00 | Alexander Konigsfeldt v Warren Sinius | 6-1,6-0 |
| UTR Pro Tennis Series Copenhagen | 2021/06/19 07:00 | Nikolaj Katic v Warren Sinius | 4-5 |
| UTR Pro Tennis Series Copenhagen | 2021/06/18 12:30 | Ludvig Aaes v Warren Sinius | 7-6,6-2 |
| UTR Pro Tennis Series Copenhagen | 2021/06/17 09:30 | Dominik Palan v Warren Sinius | 2-2 |
| UTR Pro Tennis Series Copenhagen | 2021/06/16 11:00 | Philip Hjorth v Warren Sinius | 6-3,6-5 |
| UTR Pro Tennis Series Zadar | 2021/06/30 08:00 | Josip Krstanovic v Jerko Brkic | 6-4,5-3 |
| UTR Pro Tennis Series Zadar | 2021/06/28 12:30 | Frane Nincevic v Jerko Brkic | 6-1,7-5 |
| Challenger Split | 2021/04/04 13:20 | Lukas Klein v Jerko Brkic | 6-1,6-2 |
| ITF M15 Porec | 2020/03/08 08:00 | Jerko Brkic v Gorazd Srbljak | 2-6,6-7 |
| ITF Hungary F5 Qual | 2017/06/18 08:00 | Jerko Brkic v Petr Nouza | 2-6,3-6 |
| ITF Croatia F4 Qual | 2017/03/25 10:00 | Jerko Brkic v Federico Juan Aguilar | 2-6,6-3,4-6 |
| ITF Croatia F2 | 2017/03/11 10:00 | Jerko Brkic v Sylvester Emmanuel | 1-6,3-6 |
| ITF Croatia F1 | 2017/03/04 08:00 | Jerko Brkic v Borut Puc | 2-6,1-6 |