Stadium: Court 3 Round: 44 Ground: Clay
| ITF M25 Lodz | 2023/08/07 10:30 | Yann Wojcik v Karol Filar | 6-3,6-4 |
| ITF M15 Nyiregyhaza | 2023/06/07 11:00 | Luca Wiedenmann v Karol Filar | 6-2,6-2 |
| ITF M15 Nyiregyhaza | 2023/06/05 13:30 | Sean Hess v Karol Filar | 6-1,3-6,13-15 |
| ITF M15 Nyiregyhaza | 2023/06/05 09:30 | Karol Filar v Benjamin Denis Alarcon | 6-0,6-3 |
| ITF M15 Kursumlijska Banja | 2023/04/24 10:35 | Sergei Pogosian v Karol Filar | 7-5,6-3 |
| ITF M15 Kursumlijska Banja | 2023/04/23 09:00 | Karol Filar v Dmitrii Vasilev | 6-1,4-6,12-10 |
| ITF M25 Grodzisk Mazowiecki | 2021/08/02 11:40 | Philip Bachmaier v Karol Filar | 6-2,6-3 |
| ITF M25 Grodzisk Mazowiecki | 2021/08/01 16:55 | Karol Filar v Bartlomiej Andrzejczak | 6-2,6-2 |
| ITF M25 Bielsko Biala | 2023/08/14 12:00 | Matyas Cerny v Piotr Siekanowicz | 6-7,6-1,10-6 |
| ITF M25 Bielsko Biala | 2023/08/14 07:30 | Piotr Siekanowicz v Tomas Vaise | 6-4,4-6,10-4 |
| ITF M25 Lodz | 2023/08/08 11:05 | Piotr Grynkowski v Piotr Siekanowicz | 6-4,6-1 |
| ITF M25 Lodz | 2023/08/08 07:30 | Piotr Siekanowicz v Gabriel Matuszewski | 1-6,7-6,10-6 |
| ITF M25 Lodz | 2023/08/07 10:30 | Piotr Siekanowicz v Jakub Solarski | 6-0,6-2 |