Stadium: Center Court(3) Round: 62 Ground: Clay
| ITF M15 Eupen | 2023/08/07 07:00 | Ruben Hartig v Eliott Costa | 6-0,7-6 |
| ITF M15 Eindhoven | 2023/07/30 10:30 | Ruben Hartig v Christian Lerby | 6-4,1-6,11-13 |
| ITF M25 Telfs | 2023/07/16 10:30 | Ruben Hartig v Serafin Zund | 4-6,6-3,7-10 |
| ITF M25 Esch/Alzette | 2023/07/10 14:00 | Stijn Slump v Ruben Hartig | 6-2,6-4 |
| ITF M25 Esch/Alzette | 2023/07/10 08:45 | Ruben Hartig v Victor Bini | 3-6,6-2,10-8 |
| ITF M25 Esch/Alzette | 2023/07/09 09:25 | Can Ayral v Ruben Hartig | 5-7,3-6 |
| ITF M25 Marburg | 2023/07/04 09:25 | Philipp Pavlenko v Ruben Hartig | 6-4,3-6,10-3 |
| ITF M25 Marburg | 2023/07/03 08:00 | Ruben Hartig v Tim Heger | 7-5,1-6,10-8 |
| ITF M15 Eupen | 2023/08/07 08:00 | Felix Mischker v Raphael Calzi | 7-6,6-4 |
| ITF M15 Xativa | 2023/07/30 15:00 | Felix Mischker v Sergio Callejon Hernando | 6-7,1-6 |
| ITF M15 Metzingen | 2023/07/23 14:00 | Felix Mischker v Stepan Mruzek | 6-1,2-6,5-10 |
| ITF M25 Castelo Branco | 2023/07/19 17:00 | Martyn Pawelski v Felix Mischker | 6-4,6-4 |
| ITF M25 Santa Margherita | 2023/05/01 08:00 | Rocco Piatti v Felix Mischker | 6-1,6-2 |
| ITF M25 Santa Margherita | 2023/04/30 08:00 | Paolo Emilio Cossu Floris v Felix Mischker | 2-6,1-6 |
| ITF M15 Antalya | 2023/04/09 06:30 | Felix Mischker v Takuya Kumasaka | 5-7,1-6 |
| ITF M15 Antalya | 2023/04/03 13:40 | Felix Mischker v Sean Hess | 1-6,7-5,9-11 |