Stadium: Court 1 Round: 62 Ground: Clay
| ITF M15 Bad Waltersdorf | 2021/08/26 11:45 | Matic Spec v Alen Rogic-Hadzalic | 2-6,4-6 |
| ITF M15 Bad Waltersdorf | 2021/08/25 08:55 | Savriyan Danilov v Matic Spec | 3-6,1-6 |
| ITF M15 Bad Waltersdorf | 2021/08/23 15:40 | Matic Spec v Alessandro Ragazzi | 6-2,6-1 |
| ITF M15 Bad Waltersdorf | 2021/08/23 09:00 | Matic Spec v Giorgio Tabacco | 6-4,6-3 |
| ITF M15 Warmbad-Villach | 2021/08/19 14:35 | Matic Spec v Lukas Neumayer | 2-6,3-6 |
| ITF M15 Warmbad-Villach | 2021/08/18 08:00 | Matic Spec v Lorenzo Vatteroni | 6-3,6-0 |
| ITF M15 Novi Sad | 2021/08/05 14:20 | Matic Spec v Gorazd Srbljak | 4-6,2-6 |
| ITF M15 Novi Sad | 2021/07/28 09:35 | Matic Spec v Mariano Navone | 1-6,6-4,1-6 |
| ITF M15 Warmbad-Villach | 2021/08/15 07:00 | Jonas Greif v Gabriel Decamps | 0-6,2-6 |
| ITF M25 Bolzano | 2021/08/03 15:35 | Petros Tsitsipas v Jonas Greif | 6-3,6-2 |
| ITF M15 Monastir | 2021/04/18 10:00 | Leyton Rivera v Jonas Greif | 6-1,6-2 |
| ITF M15 Monastir | 2021/04/11 08:00 | Jonas Greif v Yuta Kawahashi | 2-6,3-6 |
| ITF M15 Monastir | 2021/03/07 08:00 | Jonas Greif v Luca Castagnola | 2-6,0-6 |
| ITF M15 Monastir | 2021/02/28 09:00 | Jonas Greif v Leonardo Civita-Telles | 0-6,5-7 |
| ITF M15 Monastir | 2021/02/22 08:00 | Jonas Greif v Kenneth Raisma | 2-6,2-6 |
| ITF M15 Monastir | 2021/02/21 11:00 | Jonas Greif v Thomas George Brun | 6-4,6-0 |