Stadium: Court 9 Round: 54 Ground: Hardcourt outdoor
| ITF M25 Bydgoszcz | 2019/08/13 10:00 | Gibril Diarra v Mateusz Terczynski | 6-2,6-4 |
| ITF M25 Bydgoszcz | 2019/08/12 08:00 | Filip Ambrozy v Mateusz Terczynski | 4-6,3-6 |
| ITF M15 Koszalin | 2019/08/08 09:00 | Mateusz Terczynski v David Poljak | 1-6,6-7 |
| ITF M15 Koszalin | 2019/08/06 14:00 | Mateusz Terczynski v Sandro Szic | 6-0,6-1 |
| ITF M15 Vilnius | 2019/07/09 08:45 | Christoffer Solberg v Mateusz Terczynski | 6-1,3-6,10-5 |
| ITF M15 Vilnius | 2019/07/08 07:00 | Mateusz Terczynski v Roberts Grinvalds | 7-6,6-2 |
| ITF M15 Wroclaw | 2019/07/02 08:00 | Mateusz Terczynski v Carl Soderlund | 3-6,4-6 |
| ITF M15 Wroclaw | 2019/07/01 08:00 | Petr Michnev v Mateusz Terczynski | 4-6,4-6 |
| ITF Finland F4 | 2018/11/10 13:30 | Matvey Khomentovskiy v Hermanni Tiainen | 6-3,6-4 |
| ITF Estonia F3 | 2018/11/03 08:00 | Hermanni Tiainen v Philipp Klimov | 4-6,0-6 |
| ITF Estonia F2 | 2018/10/27 08:00 | Rihards Emulins v Hermanni Tiainen | 6-1,6-1 |
| ITF Finland F3 | 2018/08/11 12:00 | Peter Sillanpaa v Hermanni Tiainen | 6-3,6-3 |
| ITF Finland F2 Qual | 2018/08/04 10:00 | Aaron Prandstetter v Hermanni Tiainen | 7-6,6-4 |
| ITF Finland F1 Qual | 2018/07/28 07:00 | Hermanni Tiainen v Jason Sormunen | 3-6,0-6 |
| ITF Lithuania F1 | 2018/07/21 10:00 | Hermanni Tiainen v Matheus Pucinelli De Almeida | 3-6,0-6 |
| ITF Turkey F20 Qual | 2018/05/21 07:30 | Cengiz Aksu v Hermanni Tiainen | 6-1,6-1 |