Stadium: CC Round: 62 Ground: Clay
| ITF M25 Wroclaw | 2021/06/27 15:30 | Luca Castelnuovo v Piotr Grynkowski | 6-4,6-7,7-10 |
| ITF M15 Tbilisi | 2021/05/17 06:00 | Piotr Grynkowski v Christian Sigsgaard | 3-6,3-6 |
| ITF M15 Tbilisi | 2021/05/17 05:30 | Piotr Grynkowski v David Chelidze | 4-6,6-4,10-7 |
| ITF M15 Cairo | 2021/04/14 12:30 | Francesco Passaro v Piotr Grynkowski | 7-5,6-1 |
| ITF M15 Cairo | 2021/04/13 12:30 | Piotr Grynkowski v Andrea Gola | 6-3,4-6,10-2 |
| ITF M15 Bratislava | 2021/03/09 12:00 | Piotr Grynkowski v Edward Hubner | 2-6,2-6 |
| ITF M15 Bratislava | 2021/03/08 12:00 | Piotr Grynkowski v Tomas Balazi | 6-0,6-1 |
| ITF M15 Bratislava | 2021/03/03 16:55 | Piotr Grynkowski v Daniel Siniakov | 3-6,6-3,1-6 |
| ITF M25 Wroclaw | 2021/06/27 15:30 | Jeremy Schifris v Maciej Rajski | 1-6,2-6 |
| ITF M25 Poznan | 2020/08/27 08:55 | Kacper Zuk v Maciej Rajski | 6-2,6-0 |
| ITF M25 Poznan | 2020/08/26 07:55 | Piotr Matuszewski v Maciej Rajski | 3-6,6-7 |
| ITF M25 Poznan | 2020/08/25 08:00 | Maciej Rajski v Dominik Recek | 6-0,6-1 |
| ITF M25 Poznan | 2020/08/24 08:00 | Maciej Rajski v Sandro Szic | 6-2,6-2 |
| Polish National Tour | 2020/08/20 13:20 | Maciej Rajski v Aleksander Orlikowski | 1-6,6-3,6-7 |
| Polish National Tour | 2020/08/20 10:30 | Maciej Rajski v Adam Kwiatkowski | 6-2,6-2 |
| Polish National Tour | 2020/08/18 07:30 | Daniel Michalski v Maciej Rajski | 6-4,6-2 |