Stadium: Central Court
| ITF Poland F6 | 2018/08/07 08:00 | Szymon Walkow v Piotr Grynkowski | 6-3,6-2 |
| ITF Poland F2 | 2017/06/18 08:30 | Piotr Grynkowski v Szymon Walkow | 1-6,6-3,3-6 |
| Polish National Tour | 2020/06/17 07:00 | Piotr Grynkowski v Aleksander Orlikowski | 7-5,6-1 |
| ITF M15 Trnava | 2020/02/26 12:50 | Piotr Grynkowski v Jan Satral | 4-6,2-6 |
| ITF M15 Trnava | 2020/02/25 09:00 | Isa Mammetgulyyev v Piotr Grynkowski | 3-6,2-6 |
| ITF M15 Trnava | 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 Iancu-Iustinian Ghinda | 6-2,6-3 |
| ITF M15 Sharm El Sheikh | 2020/02/17 09:00 | Piotr Grynkowski v Ken Onishi | 6-1,6-4 |
| ITF M15 Sharm El Sheikh | 2020/02/12 08:00 | Pablo Vivero Gonzalez v Piotr Grynkowski | 6-3,6-3 |
| Challenger Nur-Sultan | 2020/03/11 06:30 | Elias Ymer v Szymon Walkow | 6-1,7-6 |
| Challenger Nur-Sultan | 2020/03/10 06:05 | Mikhail Elgin v Szymon Walkow | 3-6,1-6 |
| Czechia Extraliga | 2019/12/14 11:00 | Szymon Walkow v Kenny de Schepper | 2-6,2-5 |
| Czechia Extraliga | 2019/12/13 12:10 | Jozef Kovalik v Szymon Walkow | 6-2,6-2 |
| Challenger Glasgow | 2019/09/16 09:00 | Jonathan Mridha v Szymon Walkow | 4-6,6-2,7-6 |
| Challenger Sopot | 2019/07/29 09:00 | Alexander Zhurbin v Szymon Walkow | 6-4,6-4 |
| ITF M25 Nussloch | 2019/01/23 12:45 | Peter Torebko v Szymon Walkow | 6-4,7-6 |
| ITF M25 Nussloch | 2019/01/21 15:00 | Marek Gengel v Szymon Walkow | 6-4,6-7,6-10 |