| UTR Pro Tennis Series Mulheim | 2021/10/16 14:00 | Edison Ambarzumjan v Jose Antonio Rodriguez Rodriguez | 2-6,2-6 |
| UTR Pro Tennis Series Mulheim | 2021/10/14 13:00 | Edison Ambarzumjan v Tim Sandkaulen | 3-6,0-5 |
| UTR Pro Tennis Series Mulheim | 2021/10/13 10:00 | Edison Ambarzumjan v Yurii Dzhavakian | 3-6,4-6 |
| UTR Pro Tennis Series Mulheim | 2021/10/12 08:30 | Edison Ambarzumjan v Constantin Schmitz | 2-6,2-5 |
| UTR Pro Tennis Series Mulheim | 2021/10/11 07:00 | Edison Ambarzumjan v Jing L Weng | 1-6,1-6 |
| UTR Pro Tennis Series Mulheim | 2021/09/25 07:00 | Pablo Carretero v Edison Ambarzumjan | 6-4,6-2 |
| UTR Pro Tennis Series Mulheim | 2021/09/24 08:00 | Edison Ambarzumjan v Artem Podorozhnyi | 1-6,3-5 |
| UTR Pro Tennis Series Mulheim | 2021/09/22 12:30 | Edison Ambarzumjan v Jurriaan Bol | 6-4,2-6,2-6 |
| ITF M15 Troisdorf | 2021/05/09 10:00 | Osman Torski v Lucas Hellfritsch | 6-3,6-3 |
| ITF M15 Antalya | 2021/04/28 07:00 | Lucas Hellfritsch v Dan Alexandru Tomescu | 2-6,1-6 |
| ITF M15 Antalya | 2021/04/18 07:00 | Emiliano Maggioli v Lucas Hellfritsch | 7-6,6-1 |
| ITF M15 Antalya | 2021/04/11 07:00 | Gabriele Bosio v Lucas Hellfritsch | 7-6,2-6,12-10 |
| ITF M15 Antalya | 2021/04/06 07:00 | Cheong-Eui Kim v Lucas Hellfritsch | 6-7,6-2,10-7 |
| ITF M15 Antalya | 2021/04/05 07:00 | Vito Dell'Elba v Lucas Hellfritsch | 3-6,2-6 |
| ITF M15 Antalya | 2021/04/04 10:00 | Janos Fekete v Lucas Hellfritsch | 5-7,5-7 |
| ITF M15 Sharm El Sheikh | 2021/02/14 16:00 | Lui Maxted v Lucas Hellfritsch | 7-5,6-3 |