| ITF M25 Ricany | 2021/08/29 12:00 | Langmajer, Dominik v Martin Machala | 3-6,3-6 |
| ITF M25 Poznan | 2021/08/22 08:00 | Langmajer, Dominik v Marcelo Zormann | 4-6,1-6 |
| ITF M15 Lodz | 2021/08/15 11:00 | Omar Brigida v Langmajer, Dominik | 6-1,6-4 |
| ITF M15 Gdynia | 2021/08/08 08:00 | Olaf Pieczkowski v Langmajer, Dominik | 6-2,6-1 |
| ITF M25 Grodzisk Mazowiecki | 2021/08/01 09:55 | Langmajer, Dominik v Onuma, Yujiro | 3-6,3-6 |
| ITF M15 Castelo Branco | 2021/07/26 11:00 | Adan Freire Da Silva v Langmajer, Dominik | 6-3,6-2 |
| ITF M15 Castelo Branco | 2021/07/25 16:00 | Endler, Mark Owen v Langmajer, Dominik | 3-6,6-2,5-10 |
| ITF M25 Wroclaw | 2021/06/27 14:00 | Langmajer, Dominik v Terczynski, Mateusz | 1-6,3-6 |
| UTR Pro Tennis Series Ricany | 2021/09/09 07:30 | Suc, Dominik v Stefanos Sakellaridis | 5-7,6-7 |
| UTR Pro Tennis Series Ricany | 2021/09/07 09:00 | Filip Duda v Stefanos Sakellaridis | 4-6,6-4,5-2 |
| ITF M15 Bad Waltersdorf | 2021/08/31 07:00 | Luigi Sorrentino v Stefanos Sakellaridis | 6-0,5-7,10-7 |
| ITF M15 Bad Waltersdorf | 2021/08/22 09:00 | Peck, Joshua v Stefanos Sakellaridis | 1-6,6-3,11-9 |
| ITF M15 Warmbad-Villach | 2021/08/17 07:30 | Lorenzo Vatteroni v Stefanos Sakellaridis | 7-6,6-2 |
| ITF M15 Warmbad-Villach | 2021/08/16 12:30 | Leon Benedict v Stefanos Sakellaridis | 4-6,3-6 |
| ITF M15 Novi Sad | 2021/08/01 14:00 | Stefanos Sakellaridis v Lukas Palovic | 4-6,1-6 |
| ITF M25 Kottingbrunn | 2021/07/18 07:30 | Stefanos Sakellaridis v Paulovcak, Samuel | 1-6,4-6 |