Stadium: Court 2 Round: 62 Ground: Clay
| ITF M25 Madrid | 2021/09/12 13:00 | Tiainen, Hermanni v Vallejo Ferrer, Adria | 6-3,6-3 |
| ITF M15 Helsinki | 2021/05/31 08:30 | Minin, Matvey v Tiainen, Hermanni | 7-6,6-1 |
| ITF M15 Kouvola | 2021/05/26 07:40 | Tiainen, Hermanni v Lofman, Aleksi | 6-2,3-6,4-6 |
| Pajulahti, Singles M-ITF-FIN-02A | 2019/09/16 10:30 | Noskin, Egor v Tiainen, Hermanni | 4-6,6-2,10-2 |
| ITF M15 Helsinki | 2019/08/19 11:45 | Terczynski, Mateusz v Tiainen, Hermanni | 6-2,6-2 |
| ITF Finland F4 | 2018/11/10 13:30 | Khomentovskiy, Matvey v Tiainen, Hermanni | 6-3,6-4 |
| ITF Estonia F3 | 2018/11/03 08:00 | Tiainen, Hermanni v Klimov, Philipp | 4-6,0-6 |
| ITF Estonia F2 | 2018/10/27 08:00 | Emulins, Rihards v Tiainen, Hermanni | 6-1,6-1 |
| ITF - M15 Sharm El Sheikh | 2021/02/02 07:30 | Aidan Mchugh v Constantinos Koshis | 6-2,6-4 |
| ITF - M15 Sharm El Sheikh | 2021/02/01 10:30 | Constantinos Koshis v Robert Strombachs | 3-6,6-2,10-6 |
| ITF - M15 Sharm El Sheikh | 2021/01/31 07:00 | Hellfritsch, Lucas 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 |