Estadio: Court 4 Round: 25 Ground: Clay
| ITF M15 Monastir | 2021/12/07 08:00 | Piotr Grynkowski v Andrew Paulson | 3-6,3-6 |
| ITF M15 Lódz | 2021/08/18 11:40 | Daniel Michalski v Piotr Grynkowski | 6-1,6-1 |
| ITF M25 Grodzisk Mazowiecki | 2021/08/03 09:00 | Piotr Grynkowski v Pawel Juszczak | 2-6,2-6 |
| ITF M25 Wroclaw | 2021/06/28 11:00 | Piotr Grynkowski v Maciej Rajski | 6-7,4-6 |
| 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 El Cairo | 2021/04/14 12:30 | Francesco Passaro v Piotr Grynkowski | 7-5,6-1 |
| ITF M15 Doha | 2021/12/29 12:00 | Rishi Reddy v Preston Brown | 0-6,6-4,6-4 |
| ITF M15 Doha | 2021/12/28 12:00 | Preston Brown v Ali Habib | 6-4,3-6,6-10 |
| ITF M15 Doha | 2021/12/27 14:00 | Preston Brown v Saud Alhogbani | 6-1,6-1 |
| ITF M15 Doha - Clasificación | 2021/12/19 13:15 | Haoyuan Huang v Preston Brown | 6-2,6-2 |
| ITF M15 Heraklion | 2021/12/01 12:05 | Preston Brown v Arthur Fery | 2-6,6-7 |
| ITF M15 Heraklion | 2021/11/30 07:00 | Preston Brown v Charles Tzicas | 6-3,6-3 |
| ITF M15 Heraklion | 2021/11/29 10:00 | Preston Brown v Jurriaan Bol | 6-3,7-6 |
| ITF M15 Heraklion | 2021/11/25 09:20 | Dane Sweeny v Preston Brown | 6-4,6-4 |