Stadium: Court 3 Round: 26 Ground: Clay
| ITF M15 Lodz | 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 Cairo | 2021/04/14 12:30 | Francesco Passaro v Piotr Grynkowski | 7-5,6-1 |
| ITF M15 Cairo | 2021/04/13 12:30 | Piotr Grynkowski v Andrea Gola | 6-3,4-6,10-2 |
| ITF M15 Cairo | 2021/09/22 08:00 | Simon Beaupain v Simone Roncalli | 3-6,2-6 |
| ITF M15 Cairo | 2021/09/19 08:00 | Leonardo Aboian v Simone Roncalli | 6-2,6-2 |
| ITF M15 Cairo | 2021/09/18 08:00 | Simone Roncalli v Quentin Folliot | 7-6,6-0 |
| ITF M15 Cairo | 2021/09/17 08:00 | Simone Roncalli v Andrea Picchione | 6-1,6-3 |
| ITF M15 Cairo | 2021/09/16 11:30 | Simone Roncalli v Zachary Eisinga | 6-3,6-4 |
| ITF M15 Cairo | 2021/09/15 11:10 | Simone Roncalli v Louis Tessa | 3-6,7-6,6-0 |
| ITF M15 Huy | 2021/08/25 11:00 | Simon Beaupain v Simone Roncalli | 6-3,6-2 |
| ITF M15 Oldenzaal | 2021/08/18 08:00 | Simone Roncalli v Sander Jong | 4-6,3-6 |