Stadium: Court 7 Round: 26 Ground: Hardcourt outdoor
| ITF M15 Cancun | 2021/09/22 18:10 | Wishaya Trongcharoenchaikul v Maier, Jonas | 1-6,3-6 |
| ITF M15 Cancun | 2021/09/21 14:00 | Maier, Jonas v Samuel Sanchez | 6-3,6-1 |
| UTR Pro Tennis Series California | 2021/08/25 21:30 | Maier, Jonas v Gianluca Brunkow | 5-7,2-6 |
| UTR Pro Tennis Series California | 2021/08/24 21:00 | Maier, Jonas v Gomez, Lucas | 2-6,3-6 |
| UTR Pro Tennis Series California | 2021/08/23 15:00 | Sah, Timothy v Maier, Jonas | 4-6,6-1,6-3 |
| ITF M15 Gdynia | 2021/08/08 08:30 | Maier, Jonas v Pawlak, Piotr | 4-6,1-6 |
| ITF M15 Frederiksberg | 2021/08/01 10:00 | Overbeck, Carl Emil v Maier, Jonas | 6-2,6-3 |
| UTR Pro Tennis Series Nevada | 2021/06/24 16:30 | Lagaev, Nick v Maier, Jonas | 6-4,5-2 |
| ITF M15 Cancun | 2021/09/22 20:25 | Doria, Luciano v Osgar O'Hoisin | 4-6,2-6 |
| ITF M15 Cancun | 2021/09/21 14:00 | Reinberg, Emil v Osgar O'Hoisin | 6-3,6-3 |
| ITF M25 Champaign | 2021/09/14 17:00 | Gregg, Perry v Osgar O'Hoisin | 6-2,6-3 |
| UTR Pro Tennis Series Barcelona | 2021/08/08 08:30 | Kolisnyk, Olexiy v Osgar O'Hoisin | 7-6,3-6,5-2 |
| UTR Pro Tennis Series Barcelona | 2021/08/07 11:00 | Osgar O'Hoisin v Francois Musitelli | 2-0 |
| UTR Pro Tennis Series Barcelona | 2021/08/06 10:00 | Osgar O'Hoisin v Bianchi, Nicolas | 4-6,6-0,6-4 |
| UTR Pro Tennis Series Barcelona | 2021/08/04 08:30 | Osgar O'Hoisin v Kuzey Cekirge | 3-6,6-7 |
| UTR Pro Tennis Series Barcelona | 2021/08/03 07:00 | Osgar O'Hoisin v Gabarro, Xavier | 6-3,6-2 |