Stadium: Court 1 Round: 44 Ground: Clay
| ITF M15 Lodz | 2021/08/18 10:05 | Alejo Lorenzo Lingua Lavallen v Harry Wendelken | 6-2,4-6,6-4 |
| ITF M15 Lodz | 2021/08/16 11:30 | Harry Wendelken v Kamil Gajewski | 6-3,6-7,10-7 |
| ITF M15 Lodz | 2021/08/16 08:00 | Harry Wendelken v Mikolaj Borkowski | 6-0,6-3 |
| ITF M15 Gdynia | 2021/08/10 08:00 | Luke Johnson v Harry Wendelken | 6-3,6-7,10-5 |
| ITF M15 Gdynia | 2021/08/09 08:00 | Dominik Nazaruk v Harry Wendelken | 1-6,1-6 |
| ITF M15 Gdynia | 2021/08/08 08:00 | Yann Wojcik 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 M25 Prostejov | 2021/08/15 09:00 | Vojtech Vlkovsky v Ondrej Valek | 6-4,4-6,9-11 |
| ITF M15 Gdynia | 2021/08/09 08:00 | Roman Andres Burruchaga v Vojtech Vlkovsky | 6-4,6-1 |
| ITF M25 Grodzisk Mazowiecki | 2021/08/04 16:45 | Vojtech Vlkovsky v Maciej Rajski | 0-6,3-6 |
| ITF M25 Grodzisk Mazowiecki | 2021/08/02 13:00 | Yujiro Onuma v Vojtech Vlkovsky | 1-6,0-6 |
| ITF M25 Grodzisk Mazowiecki | 2021/08/02 07:55 | Vojtech Vlkovsky v Martyn Pawelski | 6-1,7-6 |
| ITF M25 Kottingbrunn | 2021/07/18 07:30 | Lukas Pokorny v Vojtech Vlkovsky | 7-6,6-4 |
| ITF M25 Most | 2021/05/24 09:00 | Stepan Mruzek v Vojtech Vlkovsky | 7-6,6-2 |
| ITF M25 Most | 2021/05/23 14:00 | Vojtech Vlkovsky v Daniel Paty | 7-6,6-3 |