Stadium: Court 1 Round: 44 Ground: Clay
| ITF M25 Poznaň | 2021/08/24 08:00 | Harry Wendelken v Jesse De Jager | 6-1,6-3 |
| ITF M25 Poznaň | 2021/08/22 08:00 | Harry Wendelken v Vojtech Vlkovsky | 6-3,6-4 |
| ITF M15 Lodž | 2021/08/18 10:05 | Alejo Lorenzo Lingua Lavallen v Harry Wendelken | 6-2,4-6,6-4 |
| ITF M15 Lodž | 2021/08/16 11:30 | Harry Wendelken v Kamil Gajewski | 6-3,6-7,10-7 |
| ITF M15 Lodž | 2021/08/16 08:00 | Harry Wendelken v Mikolaj Borkowski | 6-0,6-3 |
| ITF M15 Gdyně | 2021/08/10 08:00 | Luke Johnson v Harry Wendelken | 6-3,6-7,10-5 |
| ITF M15 Gdyně | 2021/08/09 08:00 | Dominik Nazaruk v Harry Wendelken | 1-6,1-6 |
| ITF M15 Gdyně | 2021/08/08 08:00 | Yann Wojcik v Harry Wendelken | 6-7,1-6 |
| ITF M25 Poznaň | 2021/08/24 08:00 | Juliusz Bienkiewicz v Fermin Calvo Barcelo | 4-6,2-6 |
| ITF M25 Poznaň | 2021/08/22 08:00 | Fermin Calvo Barcelo v Adam Bronka | 6-0,6-2 |
| ITF M15 Lodž | 2021/08/16 09:30 | Leonardo Aboian v Fermin Calvo Barcelo | 3-6,7-6,10-7 |
| ITF M15 Lodž | 2021/08/15 09:30 | Yujiro Onuma v Fermin Calvo Barcelo | 1-6,1-6 |
| ITF M15 Monastir | 2021/07/18 09:00 | Fermin Calvo Barcelo v Nikolay Sysoev | 3-6,6-4,6-10 |
| ITF M15 Monastir | 2021/07/12 08:00 | Jake Van Emburgh v Fermin Calvo Barcelo | 6-3,3-6,10-6 |
| ITF M15 Monastir | 2021/07/05 09:00 | Fermin Calvo Barcelo v Valentin Vacherot | 4-6,1-6 |
| UTR Pro Tennis Series - Barcelona | 2021/05/02 10:00 | Ilya Snitari v Fermin Calvo Barcelo | 7-6,6-4 |