| UTR Pro Tennis Series Zadar | 2021/06/29 11:00 | Josip Krstanovic v Constant De La Bassetiere | 1-6,6-3,6-6 |
| UTR Pro Tennis Series Zadar | 2021/06/28 12:30 | Warren Sinius v Josip Krstanovic | 2-6,1-5 |
| ITF M15 Sibenik | 2021/04/19 10:00 | Mehdi Sadaoui v Josip Krstanovic | 7-6,6-4 |
| ITF M15 Sibenik | 2021/04/18 10:00 | Josip Krstanovic v Pavle Daljev | 6-4,6-3 |
| ITF M15 Opatija | 2021/03/21 11:00 | Oleksandr Ovcharenko v Josip Krstanovic | 6-4,6-0 |
| ITF M15 Rovinj | 2021/03/15 11:00 | Josip Krstanovic v Federico Arnaboldi | 1-6,2-6 |
| ITF M15 Rovinj | 2021/03/14 08:30 | Josip Krstanovic v Mattia Frinzi | 6-2,7-6 |
| ITF M15 Porec | 2021/03/07 12:00 | Damien Wenger v Josip Krstanovic | 7-6,6-0 |
| 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 |
| ITF Italy F32 | 2016/05/14 08:00 | Jerko Brkic v Luciano Betella | 0-6,0-6 |