| UTR Pro Tennis Series - Dallas | 2021/08/30 16:00 | Jacob Brumm v Colin Markes | 1-6,5-7 |
| ITF - M15 - Monastir | 2021/08/04 17:25 | Mattia Bellucci v Jacob Brumm | 6-1,6-3 |
| ITF - M15 - Monastir | 2021/07/28 08:00 | Jacob Brumm v Eliakim Coulibaly | 3-6,2-6 |
| ITF - M15 - Monastir | 2021/07/26 14:00 | Siddhant Banthia v Jacob Brumm | 4-6,5-7 |
| ITF - M15 - Monastir | 2021/07/25 10:30 | Mohamed Amine Aissa Khelifa v Jacob Brumm | 2-6,0-6 |
| ITF - M15 - Monastir | 2021/07/21 08:30 | Nicolas Tepmahc v Jacob Brumm | 4-6,7-6,6-2 |
| ITF - M15 - Monastir | 2021/07/19 13:00 | Jacob Brumm v Matthew Dellavedova | 6-2,6-4 |
| ITF - M15 - Monastir | 2021/07/19 08:00 | Jacob Brumm v Rail Ibragimov | 6-2,6-2 |
| UTR Pro Tennis Series - Dallas | 2021/08/30 17:30 | Sander Jong v Stefan Latinov | 6-2,6-0 |
| ITF - M15 - Oldenzaal | 2021/08/20 10:20 | Sander Jong v Guy Den Heijer | 5-7,7-5,4-6 |
| ITF - M15 - Oldenzaal | 2021/08/18 08:00 | Simone Roncalli v Sander Jong | 4-6,3-6 |
| Challenger - Amersfoort | 2021/07/12 09:00 | Sander Jong v Carlos Sanchez Jover | 6-1,6-4 |
| Challenger - Amersfoort | 2021/07/11 10:00 | Eduard Esteve Lobato v Sander Jong | 2-6,5-7 |
| ITF - M25 - Den Haag | 2021/06/30 12:40 | Sander Jong v Jesper De Jong | 5-7,6-7 |
| ITF - M25 - Alkmaar | 2021/06/23 16:10 | Kai Wehnelt v Sander Jong | 6-2,7-6 |
| ITF - M15 - Alkmaar | 2020/08/24 08:00 | Martin Van Der Meerschen v Sander Jong | 6-3,7-6 |