| German Championship | 2021/12/06 10:30 | Michael Feucht v Edison Ambarzumjan | 3-6,4-5 |
| UTR Pro Tennis Series Amsterdam | 2021/11/07 09:00 | Edison Ambarzumjan v Teun Rozenberg | 1-6,2-5 |
| UTR Pro Tennis Series Amsterdam | 2021/11/06 09:00 | Lawrence Bataljin v Edison Ambarzumjan | 3-6,6-2,1-6 |
| UTR Pro Tennis Series Amsterdam | 2021/11/05 09:00 | Edison Ambarzumjan v Muller, Rik | 2-6,6-2,0-5 |
| UTR Pro Tennis Series Amsterdam | 2021/11/04 10:30 | Edison Ambarzumjan v Deney Wassermann | 4-6,4-6 |
| UTR Pro Tennis Series Amsterdam | 2021/11/03 13:30 | Ivan Denisov v Edison Ambarzumjan | 6-2,6-3 |
| UTR Pro Tennis Series Amsterdam | 2021/11/02 10:30 | Michiel de Krom v Edison Ambarzumjan | 6-1,6-1 |
| UTR Pro Tennis Series Mulheim | 2021/10/16 14:00 | Edison Ambarzumjan v Rodriguez, J. A. | 2-6,2-6 |
| ITF M15 Troisdorf | 2021/05/09 10:00 | Torski, Osman v Hellfritsch, Lucas | 6-3,6-3 |
| ITF - M15 Antalya | 2021/04/28 07:00 | Hellfritsch, Lucas v Dan Alexandru Tomescu | 2-6,1-6 |
| ITF - M15 Antalya | 2021/04/18 07:00 | Maggioli, Emiliano v Hellfritsch, Lucas | 7-6,6-1 |
| ITF - M15 Antalya | 2021/04/11 07:00 | Gabriele Bosio v Hellfritsch, Lucas | 7-6,2-6,12-10 |
| ITF - M15 Antalya | 2021/04/06 07:00 | Kim, Cheong-Eui v Hellfritsch, Lucas | 6-7,6-2,10-7 |
| ITF - M15 Antalya | 2021/04/05 07:00 | Vito Dell'Elba v Hellfritsch, Lucas | 3-6,2-6 |
| ITF - M15 Antalya | 2021/04/04 10:00 | Janos Fekete v Hellfritsch, Lucas | 5-7,5-7 |
| ITF - M15 Sharm El Sheikh | 2021/02/14 16:00 | Maxted, Lui v Hellfritsch, Lucas | 7-5,6-3 |