Stadium: Court T13 Round: 25 Ground: Clay
| Challenger Cassis | 2023/09/03 10:40 | Charles Broom v Haerteis, Johannes | 6-3,7-6 |
| ITF M15 Allershausen | 2023/08/31 14:55 | Haerteis, Johannes v Nicola Kuhn | 5-7,3-6 |
| ITF M15 Allershausen | 2023/08/30 15:10 | Haerteis, Johannes v Luca Hesselmann | 2-6,6-1,6-4 |
| ITF M25 Ystad | 2023/08/16 08:45 | Valentin Vacherot v Haerteis, Johannes | 6-2,6-7,6-4 |
| ITF M15 Frankfurt Am Main | 2023/08/11 12:50 | Lucas Gerch v Haerteis, Johannes | 7-5,6-0 |
| ITF M15 Frankfurt Am Main | 2023/08/10 10:55 | Kai Lemstra v Haerteis, Johannes | 7-5,4-6,2-6 |
| Challenger Porto | 2023/08/01 16:10 | Haerteis, Johannes v Emilio Nava | 6-7,6-7 |
| Challenger Porto | 2023/07/31 10:00 | Maia, Hugo v Haerteis, Johannes | 5-7,5-7 |
| ITF M15 Budapest | 2023/08/27 08:30 | Maginley, J. v Sallay, Peter | 6-3,6-7,6-10 |
| Coupe Davis | 2023/08/05 15:00 | Maginley, J. v Gabriel Evans | 1-6,3-6 |
| Coupe Davis | 2023/08/04 15:20 | Juan S D Collado v Maginley, J. | 5-7,5-7 |
| Coupe Davis | 2023/08/02 15:25 | Jan Neuburger-Higby v Maginley, J. | 3-6,6-7 |
| ITF M15 Pittsburgh | 2023/07/27 17:25 | Ignacio Monzon v Maginley, J. | 6-4,6-2 |
| ITF M15 Pittsburgh | 2023/07/26 16:45 | Maginley, J. v Stiles Brockett | 7-5,7-6 |
| Rochester, Singles M-ITF-USA-19A | 2023/07/18 22:30 | Maginley, J. v Preston Brown | 0-6,2-6 |
| ITF M25 Laval | 2023/07/11 14:00 | Liam Draxl v Maginley, J. | 6-4,6-4 |