Stadium: Court 5 Round: 26
| ITF Poland F9 | 2017/08/15 10:30 | Piotr Grynkowski v Nowak, Maciej | 5-7,6-1,6-3 |
| ITF Poland F9 Qual | 2017/08/14 11:50 | Piotr Grynkowski v Kaiser, Maximilian | 6-4,6-1 |
| ITF Poland F9 Qual | 2017/08/13 10:30 | Piotr Grynkowski v Borkowski, Mikolaj | 6-2,7-6 |
| Challenger Poznan Qual | 2017/07/15 09:00 | Piotr Grynkowski v Tadyszak, Norbert | 6-3,6-3 |
| ITF Poland F4 Qual | 2017/07/03 08:00 | Siimar, Mattias v Piotr Grynkowski | 6-2,6-2 |
| ITF Poland F4 Qual | 2017/07/02 13:00 | Martins Rocens v Piotr Grynkowski | 4-6,2-6 |
| ITF Poland F3 | 2017/06/27 13:40 | Piotr Grynkowski v Eriksson, Markus | 2-6,2-6 |
| ITF Poland F2 | 2017/06/18 08:30 | Piotr Grynkowski v Walkow, Szymon | 1-6,6-3,3-6 |
| ITF Poland F9 | 2017/08/15 08:00 | Dembek, Michal v Westerhof, Boy | 6-4,6-7,2-6 |
| ITF Netherlands F4 | 2017/07/15 11:30 | Tepavac, Marko v Westerhof, Boy | 6-7,6-4,6-3 |
| ITF Netherlands F4 | 2017/07/14 10:00 | Westerhof, Boy v Farquharson, Tom | 7-5,6-3 |
| ITF Netherlands F4 | 2017/07/13 16:30 | Westerhof, Boy v Petit, Gabriel | 4-6,6-4,6-3 |
| ITF Netherlands F4 | 2017/07/11 15:55 | Westerhof, Boy v Matthew Dellavedova | 6-2,6-2 |
| ITF Netherlands F3 | 2017/07/07 14:00 | Westerhof, Boy v Gijs Brouwer | 7-6,6-1 |
| ITF Netherlands F3 | 2017/07/07 09:10 | Westerhof, Boy v Monteban, Paul | 6-3,6-2 |
| ITF Netherlands F3 | 2017/07/04 14:20 | Westerhof, Boy v Stevens, Bart | 7-6,6-2 |