| 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 |