Stadium: Court 1 Round: 62 Ground: Hardcourt outdoor
| ITF M15 Sharm El Sheikh | 2021/01/31 07:00 | Lucas Hellfritsch v Constantinos Koshis | 2-6,5-7 |
| 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 Sharm El Sheikh | 2021/01/31 13:30 | Dennis Dragomirov v Robert Strombachs | 4-6,0-6 |
| ITF M15 Manacor | 2021/01/10 09:30 | Robert Strombachs v Juan P Canas Garcia | 3-6,2-6 |
| ITF M15 Manacor | 2021/01/04 10:00 | Robert Strombachs v Frane Nincevic | 1-6,0-6 |
| ITF M15 Manacor | 2021/01/03 10:30 | Robert Strombachs v Adria V. Ferrer | 6-3,6-1 |
| German Championship | 2020/12/08 16:30 | Robert Strombachs v Henri Squire | 2-6,6-7 |
| ITF M15 Heraklion | 2020/11/24 11:30 | Robert Strombachs v Matic Spec | 1-6,6-7 |
| ITF M15 Heraklion | 2020/11/24 07:30 | Robert Strombachs v Jason Janis | 6-0,6-1 |
| ITF M15 Heraklion | 2020/11/16 07:30 | Timo Stodder v Robert Strombachs | 6-1,6-1 |