| ITF Poland F4 | 2018/05/22 08:55 | Pawel Juszczak v Piotr Grynkowski | 6-2,6-3 |
| Polish National Tour | 2020/06/22 07:00 | Piotr Grynkowski v Kamil Gajewski | 6-3,6-3 |
| Polish National Tour | 2020/06/21 09:30 | Piotr Grynkowski v Szymon Walkow | 5-7,6-3,7-6 |
| Polish National Tour | 2020/06/17 07:00 | Piotr Grynkowski v Aleksander Orlikowski | 7-5,6-1 |
| ITF M15 Trnava | 2020/02/26 12:50 | Piotr Grynkowski v Jan Šátral | 4-6,2-6 |
| ITF M15 Trnava | 2020/02/25 09:00 | Isa Mammetgulyyev v Piotr Grynkowski | 3-6,2-6 |
| ITF M15 Trnava | 2020/02/24 14:00 | Jiri Barnat v Piotr Grynkowski | 3-6,2-6 |
| ITF M15 Sharm El Sheikh | 2020/02/19 15:40 | Issei Okamura v Piotr Grynkowski | 6-3,7-5 |
| ITF M15 Sharm El Sheikh | 2020/02/18 09:30 | Piotr Grynkowski v Iancu-Iustinian Ghinda | 6-2,6-3 |
| Polish National Tour | 2020/06/22 08:55 | Pawel Juszczak v Daniel Michalski | 6-1,7-6 |
| Polish National Tour | 2020/06/19 09:30 | Pawel Juszczak v Daniel Michalski | 6-1,3-6,3-6 |
| Polish National Tour | 2020/06/18 09:00 | Pawel Juszczak v Piotr Matuszewski | 6-1,6-7,6-4 |
| Polish National Tour | 2020/06/17 13:57 | Pawel Juszczak v Karol Drzewiecki | 0-0 |
| ITF - M15 Porec | 2020/03/12 09:00 | Vít Kopřiva v Pawel Juszczak | 6-4,6-1 |
| ITF - M15 Porec | 2020/03/11 10:40 | Pawel Juszczak v Colin Sinclair | 6-2,6-4 |
| ITF - M15 Porec | 2020/03/10 08:55 | Pawel Juszczak v Gorazd Srbljak | 6-4,6-2 |
| ITF - M15 Porec | 2020/03/09 09:00 | Pawel Juszczak v Kalin Ivanovski | 1-6,6-3,10-3 |