Round: 1
| ITF M25 Sunderland | 2020/02/24 11:40 | Jan Zielinski v George Houghton | 4-6,6-3,7-10 |
| ITF M25 Sunderland | 2020/02/23 13:05 | Jan Zielinski v Harry Meehan | 4-6,6-4,11-9 |
| ITF M25 Glasgow | 2020/02/19 10:00 | Jan Zielinski v Antoine Bellier | 4-6,4-6 |
| ITF M25 Glasgow | 2020/02/17 14:25 | Jan Zielinski v Hendrik Jebens | 4-6,2-6 |
| ITF M25 Glasgow | 2020/02/16 17:40 | Jan Zielinski v Euan Mcintosh | 6-4,6-2 |
| ITF M25 Barnstaple | 2020/02/13 11:20 | Kacper Zuk v Jan Zielinski | 3-6,6-0,6-1 |
| ITF M25 Barnstaple | 2020/02/12 13:05 | Jan Zielinski v Daniel Little | 6-3,6-4 |
| ITF M25 Barnstaple | 2020/02/11 13:25 | Alexis Gautier v Jan Zielinski | 6-4,6-7,4-6 |
| Marbello Cup Exhibition Series | 2020/05/23 07:30 | Makary Adamek v Mateusz Terczynski | 2-6,5-7 |
| Marbello Cup Exhibition Series | 2020/05/22 11:05 | Mateusz Terczynski v Makary Adamek | 4-6,6-2,5-10 |
| Marbello Cup Exhibition Series | 2020/05/21 13:50 | Mateusz Terczynski v Yann Wojcik | 4-6,3-6 |
| Marbello Cup Exhibition Series | 2020/05/21 11:00 | Mateusz Terczynski v Jan Galka | 2-6,3-6 |
| Marbello Cup Exhibition Series | 2020/05/20 16:00 | Mateusz Terczynski v Dominik Nazaruk | 4-6,3-6 |
| Marbello Cup Exhibition Series | 2020/05/20 10:50 | Mateusz Terczynski v Michal Wozniak | 4-6,2-6 |
| Marbello Cup Exhibition Series | 2020/05/09 11:35 | Mateusz Terczynski v Yann Wojcik | 6-0,3-6,6-1 |
| Marbello Cup Exhibition Series | 2020/05/08 09:35 | Yann Wojcik v Mateusz Terczynski | 2-6,2-6 |