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 |
| ITF M15 Sharm El Sheikh | 2020/02/17 09:00 | Moritz Trocker v Mateusz Terczynski | 6-4,6-3 |
| ITF M15 Sharm El Sheikh | 2020/02/16 11:00 | Mateusz Terczynski v Alexander Ovcharov | 6-2,3-6,10-3 |
| ITF M15 Sharm El Sheikh | 2020/02/09 12:00 | Mateusz Terczynski v Aleksei Khomich | 5-7,7-6,8-10 |
| ITF M15 Manacor | 2020/01/12 10:00 | Ugo Blanchet v Mateusz Terczynski | 6-4,6-3 |
| ITF M15 Manacor | 2020/01/06 10:30 | Mateusz Terczynski v Juan P Canas Garcia | 3-6,6-2,5-10 |
| ITF M15 Manacor | 2020/01/05 10:30 | Mateusz Terczynski v Tobias Brutscher | 6-2,6-1 |
| ITF M15 Bratislava | 2019/08/26 08:00 | Adrian Barbu v Mateusz Terczynski | 6-2,7-5 |
| ITF M15 Bratislava | 2019/08/25 11:30 | Vitalii Shcherba v Mateusz Terczynski | 0-6,3-6 |