Stadium: Court 3 Round: 62 Ground: Clay
| ITF - M15 Koszalin | 2023/09/06 09:25 | Jonas P Hartenstein v Maciej Rajski | 4-6,4-6 |
| ITF - M15 Szczawno | 2023/09/01 09:00 | Olaf Pieczkowski v Jonas P Hartenstein | 6-2,6-2 |
| ITF - M15 Szczawno | 2023/08/29 12:45 | Michal Mikula v Jonas P Hartenstein | 1-6,0-6 |
| ITF - M25 Marburg | 2023/07/05 09:00 | Alex Rybakov v Jonas P Hartenstein | 6-4,6-0 |
| ITF - M25 Marburg | 2023/07/04 08:00 | Jonas P Hartenstein v Martin Benes | 3-6,6-3,10-7 |
| ITF - M25 Risskov/Aarhus | 2023/06/15 11:55 | Max Houkes v Jonas P Hartenstein | 6-7,6-4,6-3 |
| ITF - M25 Risskov/Aarhus | 2023/06/14 10:40 | Olle Wallin v Jonas P Hartenstein | 2-6,4-6 |
| ITF - M25 Jablonec Nad Nisou | 2023/05/30 10:15 | Peter Goldsteiner v Jonas P Hartenstein | 7-5,7-5 |
| ITF - M25 Jablonec Nad Nisou | 2023/08/30 10:35 | Daniel Paty v Matej Rudolf | 6-3,6-4 |
| ITF - M25 Jablonec Nad Nisou | 2023/08/29 10:45 | Martin Benes v Matej Rudolf | 4-6,6-1,8-10 |
| ITF - M25 Jablonec Nad Nisou | 2023/08/27 09:00 | Matej Rudolf v Ezequiel Fagotti | 6-3,6-4 |