Stadium: Court 3 Round: 54 Ground: Clay
| ITF M25 Poznan | 2020/08/26 07:55 | Piotr Grynkowski v Manuel Guinard | 2-6,2-6 |
| ITF M25 Poznan | 2020/08/25 10:40 | Piotr Grynkowski v Gaston Erhardt | 6-2,6-2 |
| ITF M25 Poznan | 2020/08/24 11:00 | Piotr Grynkowski v Bartlomiej Andrzejczak | 6-4,3-6,10-5 |
| Polish National Tour | 2020/08/15 12:45 | Piotr Grynkowski v Martyn Pawelski | 6-2,6-0 |
| Polish National Tour | 2020/07/30 09:45 | Piotr Grynkowski v Jan Zielinski | 2-6,6-4,2-6 |
| Polish National Tour | 2020/07/29 09:10 | Piotr Grynkowski v Adam Kwiatkowski | 7-5,7-6 |
| Polish National Tour | 2020/07/26 09:50 | Piotr Grynkowski v Daniel Michalski | 4-6,3-6 |
| Polish National Tour | 2020/07/18 13:15 | Piotr Grynkowski v Kacper Zuk | 4-6,1-6 |
| ITF M15 Piestany | 2019/05/06 08:00 | Johannes Bangratz v Jakub Katuch | 6-0,6-3 |
| Challenger Bratislava | 2018/11/03 12:30 | Riccardo Bellotti v Jakub Katuch | 6-1,6-2 |