Stadium: Court 3 Round: 62 Ground: Clay
| ITF M25 Lodz | 2023/08/07 10:30 | Siim Troost v Piotr Grynkowski | 6-7,6-7 |
| ITF M25 Jablonec Nad Nisou | 2023/05/29 10:30 | Thijmen Loof v Piotr Grynkowski | 7-6,7-5 |
| ITF M15 Lodz | 2022/07/27 13:30 | Piotr Grynkowski v Petr Nouza | 1-6,3-6 |
| ITF M15 Lodz | 2022/07/26 13:30 | Federico Campana v Piotr Grynkowski | 3-6,4-6 |
| ITF M15 Cairo | 2022/01/12 08:00 | Daniel Michalski v Piotr Grynkowski | 6-1,6-1 |
| ITF M15 Cairo | 2022/01/06 08:00 | Piotr Grynkowski v Simone Roncalli | 4-6,1-6 |
| ITF M15 Cairo | 2022/01/05 07:30 | Piotr Grynkowski v Preston Brown | 5-7,6-4,6-2 |
| ITF M15 Monastir | 2021/12/07 08:00 | Piotr Grynkowski v Andrew Paulson | 3-6,3-6 |
| ITF M25 Lodz | 2023/08/08 07:30 | Piotr Siekanowicz v Gabriel Matuszewski | 1-6,7-6,10-6 |
| ITF M25 Lodz | 2023/08/07 10:30 | Piotr Siekanowicz v Jakub Solarski | 6-0,6-2 |