Stadium: Wisla Centrum 1 Round: 26 Ground: Clay
| ITF Qatar F5 Qual | 2017/12/11 12:00 | Aslan Karatsev v Guy Den Heijer | 6-4,6-2 |
| ITF Qatar F5 Qual | 2017/12/10 13:30 | Iznaur Akhmaev v Guy Den Heijer | 2-6,0-6 |
| ITF Qatar F4 | 2017/12/06 13:20 | Maximilian Neuchrist v Guy Den Heijer | 6-2,7-6 |
| ITF Qatar F4 | 2017/12/05 18:05 | Guy Den Heijer v Milan Drinic | 6-1,6-2 |
| ITF Qatar F4 Qual | 2017/12/04 12:00 | Saida'lo Saidkarimov v Guy Den Heijer | 1-6,2-6 |
| ITF Qatar F4 Qual | 2017/12/03 15:10 | Quentin Folliot v Guy Den Heijer | 4-6,2-6 |
| ITF Tunisia F33 | 2017/10/31 12:30 | Guy Den Heijer v Gabriel Petit | 3-6,5-7 |
| ITF Tunisia F32 | 2017/10/25 08:30 | Guy Den Heijer v Steven Diez | 3-6,2-6 |
| ITF Czech Republic F11 Qual | 2017/11/19 09:00 | Grzegorz Panfil v Piotr Grynkowski | 7-6,6-3 |
| ITF Czech Republic F8 Qual | 2017/10/30 11:00 | Tadeas Paroulek v Piotr Grynkowski | 6-2,5-7,6-3 |
| ITF Czech Republic F7 Qual | 2017/10/24 08:00 | Lukas Vejvara v Piotr Grynkowski | 6-3,6-4 |
| ITF Czech Republic F7 Qual | 2017/10/23 08:00 | Pavel Motl v Piotr Grynkowski | 5-7,2-6 |
| Challenger Szczecin Qual | 2017/09/09 14:10 | Piotr Grynkowski v Guillermo Duran | 4-6,2-6 |
| ITF Poland F11 | 2017/08/28 09:00 | Piotr Grynkowski v Adam Chadaj | 4-6,1-6 |
| ITF Poland F9 | 2017/08/16 10:20 | Piotr Grynkowski v Boy Westerhof | 1-6,4-6 |
| ITF Poland F9 | 2017/08/15 10:30 | Piotr Grynkowski v Maciej Nowak | 5-7,6-1,6-3 |