Stadium: Court 3 Round: 54 Ground: Clay
| ITF M15 Cairo | 2021/01/10 07:00 | Piotr Grynkowski v Francesco Passaro | 5-7,1-6 |
| ITF M15 Cairo | 2021/01/08 08:00 | Maxence Beauge v Piotr Grynkowski | 6-3,1-6,6-1 |
| ITF M15 Cairo | 2021/01/07 08:00 | Piotr Grynkowski v Lorenzo Bocchi | 1-6,6-4,6-3 |
| ITF M15 Cairo | 2021/01/06 08:00 | Alejo Lorenzo Lingua Lavallen v Piotr Grynkowski | 6-4,5-7,5-7 |
| ITF M15 Cairo | 2021/01/04 12:00 | Piotr Grynkowski v Muthu A Senthilkumar | 6-3,6-1 |
| ITF M15 Cairo | 2021/01/04 09:00 | Piotr Grynkowski v Stevan Popovic | 6-1,6-0 |
| 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 M15 Bratislava | 2020/11/23 09:00 | Jakub Katuch v Noah Thurner | 6-7,7-5,9-11 |
| 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 |