| 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 Gajewski, Kamil | 6-3,6-3 |
| Polish National Tour | 2020/06/21 09:30 | Piotr Grynkowski v Walkow, Szymon | 5-7,6-3,7-6 |
| Polish National Tour | 2020/06/17 07:00 | Piotr Grynkowski v Aleksander Orlikowski | 7-5,6-1 |
| Trnava, Singles Main, M-ITF-SVK-03A | 2020/02/26 12:50 | Piotr Grynkowski v Satral, Jan | 4-6,2-6 |
| Trnava, Singles Main, M-ITF-SVK-03A | 2020/02/25 09:00 | Mammetgulyyev, Isa v Piotr Grynkowski | 3-6,2-6 |
| Trnava, Singles Main, M-ITF-SVK-03A | 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 Ghinda, Iancu-Lustinian | 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 Matuszewski, Piotr | 6-1,6-7,6-4 |
| Polish National Tour | 2020/06/17 13:57 | Pawel Juszczak v Drzewiecki, Karol | 0-0 |
| ITF - M15 Porec | 2020/03/12 09:00 | Vit Kopriva 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 Ivanovski, Kalin | 1-6,6-3,10-3 |