Stadium: Court 2 Round: 25 Ground: Clay
| ITF M15 Szczawno | 2023/09/01 09:00 | Olaf Pieczkowski v Jonas P Hartenstein | 6-2,6-2 |
| ITF M15 Szczawno | 2023/08/29 12:51 | 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 | 2023/05/29 09:00 | Patrik Oplustil v Jonas P Hartenstein | 3-6,0-6 |
| ITF M15 Szczawno | 2023/09/01 13:05 | Maciej Rajski v Karol Filar | 6-0,6-0 |
| ITF M15 Szczawno | 2023/08/31 16:17 | Peter Benjamin Privara v Maciej Rajski | 4-6,7-6,4-6 |
| ITF M15 Szczawno | 2023/08/30 17:12 | Maciej Rajski v Mateusz Terczynski | 6-2,6-7,6-1 |
| ITF M25 Poznan | 2023/08/25 11:00 | Georgii Kravchenko v Maciej Rajski | 6-2,4-6,7-6 |
| ITF M25 Poznan | 2023/08/24 09:00 | Maciej Rajski v Mohamed Safwat | 6-7,6-3,6-3 |
| ITF M25 Poznan | 2023/08/23 10:15 | Maciej Rajski v Marcel Kamrowski | 6-3,6-2 |
| ITF M25 Bielsko Biala | 2023/08/18 10:25 | Tommaso Compagnucci v Maciej Rajski | 6-4,4-6,7-6 |
| ITF M25 Bielsko Biala | 2023/08/17 10:10 | Maciej Rajski v Alex M Pujolras | 4-6,6-3,6-4 |