Stadium: Court 3 Round: 62 Ground: Hardcourt outdoor
| ITF - M15 Monastir | 2021/10/24 09:00 | Matas Vasiliauskas v Egor Tsarapkin | 6-4,6-1 |
| ITF - M15 Monastir | 2021/10/20 13:30 | Ajeet Rai v Matas Vasiliauskas | 6-2,6-2 |
| ITF - M15 Monastir | 2021/10/13 08:30 | Matas Vasiliauskas v Gage Brymer | 4-6,2-6 |
| ITF - M15 Monastir | 2021/10/11 14:00 | Matas Vasiliauskas v Warren Wood | 6-3,7-6 |
| ITF - M15 Monastir | 2021/10/11 09:00 | Matas Vasiliauskas v Rayen Zribi | 6-1,6-1 |
| ITF - M15 Monastir | 2021/10/04 13:00 | Kousuke Ogura v Matas Vasiliauskas | 7-5,6-4 |
| ITF - M15 Monastir | 2021/10/04 08:00 | Max Cunat v Matas Vasiliauskas | 1-6,0-6 |
| ITF - M15 Monastir | 2021/09/30 08:00 | Ryota Tanuma v Matas Vasiliauskas | 6-3,6-2 |
| ITF - M15 Monastir | 2021/10/17 09:30 | Jonas Greif v Rishabdev Raman | 5-7,1-6 |
| ITF M15 - Bad Waltersdorf | 2021/08/30 07:00 | Matic Spec v Jonas Greif | 6-0,6-1 |
| 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 |