| 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 |
| UTR Pro Tennis Series Nevada | 2021/06/23 18:00 | Kiger, Mac v Maier, Jonas | 6-3,6-7,4-6 |
| UTR Pro Tennis Series Nevada | 2021/06/21 15:00 | Bjorn Swenson v Maier, Jonas | 6-4,6-4 |
| ITF M15 Kouvola | 2021/05/26 13:30 | Maier, Jonas v Joao Victor C Loureiro | 4-6,3-6 |
| UTR Pro Tennis Series California | 2021/08/24 19:30 | Sah, Timothy v Gianluca Brunkow | 3-6,6-3,5-1 |
| UTR Pro Tennis Series California | 2021/08/23 16:30 | Gomez, Lucas v Gianluca Brunkow | 7-5,6-3 |
| UTR Pro Tennis Series California | 2021/08/22 15:00 | Pereira, Bryce v Gianluca Brunkow | 3-6,4-6 |