Stadium: Court 5 Round: 25 Ground: Clay
| ITF M25 Poznan | 2021/08/24 16:10 | Harry Wendelken v Fermin Calvo Barcelo | 6-2,6-3 |
| ITF M25 Poznan | 2021/08/24 08:00 | Harry Wendelken v Jesse De Jager | 6-1,6-3 |
| ITF M25 Poznan | 2021/08/22 08:00 | Harry Wendelken v Vojtech Vlkovsky | 6-3,6-4 |
| 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 Lodz | 2021/08/21 08:00 | Gilbert S K Junior v Maciej Rajski | 4-6,6-7 |
| ITF M15 Lodz | 2021/08/20 10:15 | Daniel Michalski v Gilbert S K Junior | 6-4,3-6,3-6 |
| ITF M15 Lodz | 2021/08/19 10:00 | Tommaso Compagnucci v Gilbert S K Junior | 4-6,2-6 |
| ITF M15 Lodz | 2021/08/18 11:25 | Aristotelis Thanos v Gilbert S K Junior | 2-6,3-6 |
| ITF M15 Gdynia | 2021/08/12 09:25 | Gilbert S K Junior v Daniel De Jonge | 5-7,1-6 |
| ITF M15 Gdynia | 2021/08/11 09:40 | Antonin Bolardt v Gilbert S K Junior | 6-2,1-6,2-6 |
| ITF M25 Grodzisk Mazowiecki | 2021/08/07 07:00 | Gilbert S K Junior v Toby Alex Kodat | 6-1,6-7,3-6 |
| ITF M25 Grodzisk Mazowiecki | 2021/08/05 08:30 | Filip Peliwo v Gilbert S K Junior | 3-6,5-7 |