Stadium: Court 1 Round: 25 Ground: Clay
| ITF M15 Bratislava | 2021/08/16 10:30 | Frane Nincevic v Vitalii Shcherba | 6-2,7-5 |
| ITF M15 Novi Sad | 2021/08/01 09:30 | Frane Nincevic v Aleksandar Tomas | 6-4,3-6,6-10 |
| ITF M15 Doboj | 2021/07/15 08:00 | Peter Fajta v Frane Nincevic | 4-6,6-3,7-6 |
| ITF M15 Doboj | 2021/07/13 11:30 | Frane Nincevic v Christoffer Solberg | 6-2,7-6 |
| ITF M25 Velenje | 2021/07/06 08:00 | Frane Nincevic v Nemanja Malesevic | 4-6,6-1,5-10 |
| ITF M25 Velenje | 2021/07/05 09:00 | Frane Nincevic v Nicolas Bruna | 5-7,7-6,11-9 |
| UTR Pro Tennis Series Zadar | 2021/07/03 07:00 | Vito Tonejc v Frane Nincevic | 6-4,5-2 |
| UTR Pro Tennis Series Zadar | 2021/07/02 12:30 | Josip Krstanovic v Frane Nincevic | 6-4,1-6,7-5 |
| ITF M15 Novi Sad | 2021/08/01 12:45 | Andrej Krajcik v Eric Morris | 1-6,6-1,8-10 |
| ITF M15 Novi Sad | 2021/07/25 08:15 | Matic Dimic v Andrej Krajcik | 6-4,5-7,10-8 |
| ITF M15 Poprad | 2021/07/04 08:00 | Andrej Krajcik v Caspar Schuetze | 1-6,2-6 |
| ITF M15 Antalya | 2021/06/20 07:00 | Sergo Sikharulidze v Andrej Krajcik | 4-6,6-3,10-6 |
| ITF M15 Monastir | 2021/04/18 10:00 | Simon Sedliak v Andrej Krajcik | 6-1,6-0 |
| ITF M15 Monastir | 2021/04/11 10:00 | Igor Marcondes v Andrej Krajcik | 6-2,6-3 |
| ITF M15 Monastir | 2021/04/04 10:30 | Andrej Krajcik v Nicolas Tepmahc | 2-6,0-6 |
| ITF M15 Bratislava | 2021/03/08 12:00 | Andrej Krajcik v Stepan Pecak | 3-6,2-6 |