Stadium: CEE Logistic Round: 25 Ground: Clay
| ITF M15 Allershausen | 2023/08/30 08:00 | Louis Van Herck v Dennis Bloemke | 3-6,1-6 |
| ITF M15 Ueberlingen | 2023/08/16 13:10 | Jakob Schnaitter v Justin Engel | 7-6,6-1 |
| ITF M25 Wetzlar | 2023/08/01 12:40 | Justin Engel v Diego Dedura-Palomero | 5-7,2-6 |
| ITF M15 Uslar | 2023/07/19 09:55 | Juan C P Angelo v Justin Engel | 6-2,6-4 |
| ITF M15 Uslar | 2023/07/17 16:00 | Justin Engel v Noah Schlagenhauf | 6-3,6-0 |
| 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 |