Stadium: Court 1 Round: 62 Ground: Clay
| ITF M15 Gdynia | 2021/08/10 08:00 | Johnson, Luke v Harry Wendelken | 6-3,6-7,10-5 |
| ITF M15 Gdynia | 2021/08/09 08:00 | Nazaruk, Dominik v Harry Wendelken | 1-6,1-6 |
| ITF M15 Gdynia | 2021/08/08 08:00 | Wojcik, Yann v Harry Wendelken | 6-7,1-6 |
| ITF M25 Idanha-A-Nova | 2021/07/11 13:00 | Francisco Rocha v Harry Wendelken | 7-6,6-4 |
| ITF M15 Almada | 2021/07/09 08:30 | Harry Wendelken v Daniel Cox | 2-6,1-6 |
| ITF M15 Almada | 2021/07/08 08:30 | Leote Prata, Martim v Harry Wendelken | 4-6,6-7 |
| ITF M15 Almada | 2021/07/07 08:30 | Breysach , Martin v Harry Wendelken | 3-6,3-6 |
| ITF M15 Almada | 2021/07/05 10:00 | Harry Wendelken v Luigi Castelletti | 6-0,6-0 |
| ITF M15 Lodz | 2021/08/15 08:00 | Ilnytskyy, Svyatoslav v Borkowski, Mikolaj | 4-6,6-3,5-10 |
| ITF M15 Gdynia | 2021/08/08 08:00 | Borkowski, Mikolaj v Galus, Piotr | 6-7,1-6 |
| ITF M25 Grodzisk Mazowiecki | 2021/08/01 17:05 | Postolka, Roman v Borkowski, Mikolaj | 6-1,6-0 |
| ITF M25 Wroclaw | 2021/06/27 11:00 | Borkowski, Mikolaj v Oleksandr Ovcharenko | 4-6,0-6 |
| ITF M25 Poznan | 2020/08/24 08:00 | Pawel Juszczak v Borkowski, Mikolaj | 6-4,6-0 |
| ITF M25 Poznan | 2020/08/23 08:00 | Borkowski, Mikolaj v Davies, George | 6-4,6-3 |
| Polish National Tour | 2020/08/15 16:00 | Gajewski, Kamil v Borkowski, Mikolaj | 6-4,6-3 |
| ITF M25 Poznan | 2019/08/20 08:55 | Juliusz Bienkiewicz v Borkowski, Mikolaj | 6-0,6-3 |