Estadio: Court 1 Round: 54 Ground: Clay
| ITF M15 Uslar | 2023/07/17 08:00 | Andrea Gola v Justin Engel | 2-6,3-6 |
| ITF M25 Kassel | 2023/07/13 09:25 | Daniel Dutra Da Silva v Justin Engel | 6-1,6-3 |
| ITF M25 Kassel | 2023/07/12 09:55 | Justin Engel v Hazem Naw | 4-6,6-4,6-4 |
| Challenger Karlsruhe | 2023/07/02 11:40 | Justin Engel v Carlos Sanchez Jover | 6-0,3-6,3-6 |
| ITF M15 Oberhaching | 2023/02/12 09:00 | Justin Engel v Michael Gloeckler | 4-6,3-6 |
| ITF 15 Antalya | 2022/10/24 10:30 | Nicolas Parizzia v Justin Engel | 6-0,6-2 |
| ITF 15 Antalya | 2022/10/23 07:00 | Justin Engel v Umut Kaan Yenilmez | 6-3,6-1 |
| ITF 15 Antalya | 2022/10/19 10:10 | Justin Engel v Marsel Ilhan | 4-6,4-6 |
| ITF M15 Uslar | 2023/07/17 10:30 | Linus Krohn v Noah Schlagenhauf | 5-7,3-6 |
| ITF M15 Store | 2023/06/20 10:05 | Pietro Pampanin v Noah Schlagenhauf | 6-4,6-2 |
| ITF M15 Store | 2023/06/19 14:05 | Vaal Urankar v Noah Schlagenhauf | 3-6,3-6 |
| ITF M15 Duffel | 2023/06/14 08:00 | Noah Schlagenhauf v Tibo Colson | 5-7,0-6 |
| ITF M15 Duffel | 2023/06/12 10:00 | Nico Hornitschek v Noah Schlagenhauf | 5-7,6-7 |
| ITF M15 Duffel | 2023/06/11 12:30 | Rik Muller v Noah Schlagenhauf | 6-7,7-6,6-10 |
| ITF M15 Sarajevo | 2023/06/07 07:00 | Noah Schlagenhauf v Matias Zukas | 1-6,5-7 |
| ITF M15 Sarajevo | 2023/06/06 07:45 | Nino Toto v Noah Schlagenhauf | 2-6,2-6 |