Stadium: Court 2 Round: 46 Ground: Clay
| Challenger Poznan Qual | 2017/07/15 09:00 | Piotr Grynkowski v Norbert Tadyszak | 6-3,6-3 |
| ITF Poland F4 Qual | 2017/07/03 08:00 | Mattias Siimar 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 Markus Eriksson | 2-6,2-6 |
| ITF Poland F2 | 2017/06/18 08:30 | Piotr Grynkowski v Szymon Walkow | 1-6,6-3,3-6 |
| ITF Turkey F17 | 2017/05/01 07:30 | Gorazd Srbljak v Piotr Grynkowski | 6-3,6-2 |
| ITF Turkey F16 | 2017/04/25 07:00 | Volodymyr Uzhylovskyi v Piotr Grynkowski | 2-6,6-2,6-1 |
| ITF Turkey F16 | 2017/04/24 07:30 | Fermin Tenti v Piotr Grynkowski | 7-5,5-7,4-6 |
| Challenger Braunschweig Qual | 2017/07/08 11:20 | Julian Onken v Nicola Kuhn | 4-6,3-6 |
| Challenger Braunschweig Qual | 2017/07/08 08:00 | Julian Onken v Arnd Weyhausen | 6-2,6-4 |
| ITF Germany F4 | 2017/06/22 15:25 | Dominik Boehler v Julian Onken | 6-3,6-1 |
| ITF Germany F4 | 2017/06/20 14:20 | Linus Krohn v Julian Onken | 5-7,6-7 |
| ITF Turkey F15 | 2017/04/18 10:15 | Julian Onken v Cem Ilkel | 2-6,3-6 |
| ITF Turkey F14 | 2017/04/13 08:30 | Marsel Ilhan v Julian Onken | 4-6,6-1,6-0 |
| ITF Turkey F14 | 2017/04/11 07:30 | Simon Navarro v Julian Onken | 2-6,7-6,2-6 |
| ITF Croatia F4 | 2017/03/28 12:00 | Julian Onken v Andrej Martin | 4-6,7-6,1-6 |