Stadium: Court 5 Round: 25 Ground: Carpet indoor
| ITF M15 Doha | 2023/10/09 18:00 | Lasse Poertner v Koray Kirci | 6-3,4-6,2-6 |
| ITF M15 Uberlingen | 2023/08/18 10:00 | Lasse Poertner v Jakob Schnaitter | 2-6,4-6 |
| ITF M15 Uberlingen | 2023/08/17 10:50 | Lasse Poertner v Illya Beloborodko | 6-4,3-6,6-3 |
| ITF M15 Frankfurt Am Main | 2023/08/08 09:00 | Lasse Poertner v Florian Broska | 5-7,1-6 |
| ITF M15 Eindhoven | 2023/08/01 09:55 | Elmer Moller v Lasse Poertner | 6-3,6-0 |
| ITF M15 Metzingen | 2023/07/26 15:35 | Lasse Poertner v Nicola Kuhn | 6-7,2-6 |
| ITF M15 Tanger | 2023/06/07 09:00 | Lasse Poertner v Andrea Bacaloni | 2-6,6-7 |
| ITF M15 Metzingen | 2022/07/20 11:00 | Lasse Poertner v Deney Wassermann | 3-6,4-6 |
| ITF M15 Cadolzburg | 2024/01/15 10:00 | Stepan Baum v Mischa Lanz | 5-7,3-6 |
| ITF M25 Pardubice | 2023/09/19 08:00 | Noel Larwig v Stepan Baum | 0-6,6-3,10-7 |
| ITF M25 Pardubice | 2023/09/17 09:00 | Ondrej Hujo v Stepan Baum | 4-6,0-6 |
| ITF M15 Szczawno | 2023/08/28 10:00 | Stepan Baum v Jonathan Backman | 2-6,6-4,3-10 |
| ITF M15 Trier | 2023/08/25 10:00 | Stepan Baum v Hazem Naw | 3-6,5-7 |
| ITF M15 Trier | 2023/08/24 10:55 | Stepan Baum v Jannik Opitz | 6-2,6-2 |
| ITF M15 Trier | 2023/08/23 10:55 | Marlon Vankan v Stepan Baum | 2-6,0-6 |
| ITF M15 Trier | 2023/08/21 13:00 | Stepan Baum v Tristan Reiff | 6-2,6-2 |