Round: 62 Ground: Hardcourt outdoor
| ITF M15 Monastir | 2021/04/12 08:00 | Jonas Maier v Amaury Raynel | 4-6,2-6 |
| ITF M15 Monastir | 2021/04/11 09:00 | Simon Sedliak v Jonas Maier | 2-6,4-6 |
| UTR Pro Tennis Series California | 2021/02/20 17:30 | Jonas Maier v Keenan Mayo | 5-7,0-0 |
| UTR Pro Tennis Series California | 2021/02/19 16:00 | Joshua Ortlip v Jonas Maier | 6-7,6-2,5-4 |
| UTR Pro Tennis Series California | 2021/02/18 20:30 | Alexander Sarkissian v Jonas Maier | 6-3,6-4 |
| UTR Pro Tennis Series California | 2021/02/16 21:30 | Aaron Bailey v Jonas Maier | 6-3,6-4 |
| UTR Pro Tennis Series California | 2021/02/15 16:00 | Jonas Maier v Kalman Boyd | 6-2,5-0 |
| ITF M25 Fayetteville | 2020/11/02 20:30 | Jonas Maier v Kiranpal Pannu | 3-6,4-6 |
| ITF M15 Antalya | 2021/04/18 07:00 | Stefan Loncar v Gabriele Maria Noce | 3-6,1-6 |
| ITF M15 Antalya | 2021/04/13 07:00 | Stefan Loncar v Gianmarco Ferrari | 7-6,2-6,4-10 |
| ITF M15 Antalya | 2021/04/12 07:00 | Giuseppe La Vela v Stefan Loncar | 4-6,2-6 |
| ITF M15 Antalya | 2021/04/11 07:00 | Danylo Veremeychuk v Stefan Loncar | 3-6,2-6 |
| ITF M15 Opatija | 2021/03/22 13:15 | Stefan Loncar v Mattia Frinzi | 3-6,6-7 |
| ITF M15 Opatija | 2021/03/21 13:00 | Milos Vukovic v Stefan Loncar | 2-6,6-4,7-10 |
| ITF M25 La Nucia | 2021/03/14 14:00 | Kuzey Cekirge v Stefan Loncar | 6-3,6-2 |
| ITF M25 Villena | 2021/01/31 10:30 | Stefan Loncar v Zakhar Trapeznikov | 2-6,2-6 |