| Challenger Szczecin | 2019/09/11 11:30 | Filip Kolasinski v Facundo Arguello | 4-6,6-7 |
| Challenger Szczecin | 2019/09/10 16:15 | Filip Kolasinski v Louis Wessels | 6-3,7-5 |
| ITF M25 Poznan | 2019/08/22 14:25 | Diego Hidalgo v Filip Kolasinski | 6-3,7-5 |
| ITF M25 Poznan | 2019/08/21 10:00 | Piotr Matuszewski v Filip Kolasinski | 2-6,6-4,5-7 |
| ITF M25 Poznan | 2019/08/20 08:00 | Karol Drzewiecki v Filip Kolasinski | 7-5,5-7,10-12 |
| ITF M15 Irpin | 2019/08/14 07:30 | Vladyslav Orlov v Filip Kolasinski | 6-1,6-4 |
| ITF M15 Irpin | 2019/08/13 10:20 | Filip Kolasinski v Aleksandr Braynin | 6-4,6-0 |
| ITF M15 Irpin | 2019/08/12 12:00 | Simonas Zukauskas v Filip Kolasinski | 1-6,1-6 |
| 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 M25 Barnstaple | 2020/02/10 10:30 | Jan Zielinski v Sacha Modica | 6-2,7-6 |
| ITF M25 Barnstaple | 2020/02/09 10:00 | Jan Zielinski v Luc Woodall | 6-0,6-1 |
| ITF M25 Nussloch | 2020/01/20 16:00 | Leopold Zima v Jan Zielinski | 6-4,7-6 |
| ITF M25 Nussloch | 2020/01/20 10:25 | Marcus Mansson v Jan Zielinski | 7-6,4-6,8-10 |