Stadium: Court 3 Round: 62 Ground: Hardcourt outdoor
| German Championship | 2020/12/07 15:00 | Lucas Hellfritsch v Jakob Schnaitter | 4-6,5-6 |
| ITF M15 Monastir | 2020/10/18 13:00 | Lucas Hellfritsch v Gabriel Roveri Sidney | 6-7,3-6 |
| ITF M15 Monastir | 2020/10/14 07:55 | Lucas Hellfritsch v Guido Ivan Justo | 2-6,3-6 |
| ITF M15 Monastir | 2020/03/09 08:00 | Lucas Hellfritsch v Savva Polukhin | 2-6,1-6 |
| ITF M15 Oberhaching | 2020/02/16 10:30 | Marco De Rossi v Lucas Hellfritsch | 5-7,6-2,10-2 |
| ITF M15 Sharm El Sheikh | 2019/11/24 08:00 | Lucas Hellfritsch v Alexey Zakharov | 4-6,1-6 |
| ITF M15 Sharm El Sheikh | 2019/11/23 08:00 | Lucas Hellfritsch v Ryan Nijboer | 6-2,6-3 |
| ITF M15 Sharm El Sheikh | 2019/11/22 08:00 | Lucas Hellfritsch v Luca Potenza | 7-6,7-5 |
| ITF M15 Antalya | 2021/01/13 09:45 | Constantinos Koshis v Federico Arnaboldi | 1-6,2-6 |
| ITF M15 Antalya | 2021/01/12 07:00 | Constantinos Koshis v Igor Trunov | 6-2,6-4 |
| ITF M15 Antalya | 2021/01/11 07:00 | Billy Harris v Constantinos Koshis | 7-6,6-7,6-10 |
| ITF M15 Antalya | 2021/01/10 06:00 | Arda Azkara v Constantinos Koshis | 6-7,6-0,8-10 |
| ITF M15 Antalya | 2021/01/07 07:00 | Constantinos Koshis v Sergey Fomin | 3-6,3-6 |
| ITF M15 Antalya | 2021/01/06 07:30 | Credit Chaiyarin v Constantinos Koshis | 1-6,3-6 |
| ITF M15 Cairo | 2020/12/09 08:00 | Constantinos Koshis v Ignacio Monzon | 1-6,6-4,1-6 |
| ITF M15 Cairo | 2020/12/08 08:00 | Max Houkes v Constantinos Koshis | 5-7,6-4,7-10 |