Stadium: Court 1 Round: 26
| ITF Poland F11 | 2017/08/29 11:50 | Kowalczyk, Mateusz v Lozan, Kristian | 6-4,6-1 |
| ITF Poland F11 | 2017/08/27 08:00 | Mularczyk, Konrad v Kowalczyk, Mateusz | 2-6,2-6 |
| ITF Poland F8 | 2017/08/01 13:55 | Andrzejczuk, Adrian v Kowalczyk, Mateusz | 6-2,6-3 |
| ITF Poland F8 Qual | 2017/08/01 07:30 | Ivan Marrero Curbelo v Kowalczyk, Mateusz | 6-7,1-6 |
| ITF Poland F8 Qual | 2017/07/29 08:00 | Innocenti, Davide v Kowalczyk, Mateusz | 4-6,4-6 |
| ITF Italy F7 | 2017/04/03 11:45 | Kowalczyk, Mateusz v Gianluca Mager | 4-6,3-6 |
| ITF Italy F7 Qual | 2017/04/02 07:30 | Javier Barranco Cosano v Kowalczyk, Mateusz | 3-6,4-6 |
| ITF Italy F7 Qual | 2017/04/01 07:30 | Kowalczyk, Mateusz v Marasin, Alexandru Catalin | 6-0,7-5 |
| ITF Poland F11 | 2017/08/29 09:00 | Wojnar, Bartosz v Mlazga, Krzysztof | 5-7,6-2,6-1 |
| ITF Turkey F30 | 2017/08/16 16:05 | Wojnar, Bartosz v Ergi Kirkin | 6-3,3-6,1-6 |
| ITF Turkey F30 Qual | 2017/08/14 07:00 | Bojanovic, Darko v Wojnar, Bartosz | 6-4,5-7,3-6 |
| ITF Turkey F30 Qual | 2017/08/13 10:00 | Gabriele Maria Noce v Wojnar, Bartosz | 3-6,2-6 |
| ITF Turkey F30 Qual | 2017/08/12 12:30 | Georgiev, Yoan v Wojnar, Bartosz | 6-7,6-4,3-6 |
| ITF Turkey F29 | 2017/08/10 06:30 | Nedelko, Ivan v Wojnar, Bartosz | 6-2,6-1 |
| ITF Turkey F29 | 2017/08/09 13:00 | Alekseenko, Gleb v Wojnar, Bartosz | 0-6,2-6 |
| ITF Turkey F29 | 2017/08/07 08:50 | Bessire, Andrea v Wojnar, Bartosz | 6-7,2-6 |