Stadium: Court 1 Round: 54 Ground: Clay
| ITF M15 Uslar | 2023/07/17 08:00 | 골라, 안드레아 v Justin Engel | 2-6,3-6 |
| ITF M25 Kassel | 2023/07/13 09:25 | 두트라 다 실바, 다니엘 v Justin Engel | 6-1,6-3 |
| ITF M25 Kassel | 2023/07/12 09:55 | Justin Engel v 나우, 하젬 | 4-6,6-4,6-4 |
| Challenger Karlsruhe | 2023/07/02 11:40 | Justin Engel v 산체즈 조벨, 카를로스 | 6-0,3-6,3-6 |
| ITF M15 Oberhaching | 2023/02/12 09:00 | Justin Engel v 클로에클러, 미가엘 | 4-6,3-6 |
| ITF M15 Antalya | 2022/10/24 10:30 | 파리지아, 니콜라스 v Justin Engel | 6-0,6-2 |
| ITF M15 Antalya | 2022/10/23 07:00 | Justin Engel v Yenilmez, Umut Kaan | 6-3,6-1 |
| ITF M15 Antalya | 2022/10/19 10:10 | Justin Engel v 일란, 마르셀 | 4-6,4-6 |
| ITF M15 Uslar | 2023/07/17 10:30 | Krohn, Linus v Schlagenhauf, Noah | 5-7,3-6 |
| ITF M15 Store | 2023/06/20 10:05 | Pampanin, Pietro v Schlagenhauf, Noah | 6-4,6-2 |
| ITF M15 Store | 2023/06/19 14:05 | Vaal Urankar v Schlagenhauf, Noah | 3-6,3-6 |
| ITF M15 Duffel | 2023/06/14 08:00 | Schlagenhauf, Noah v Colson, Tibo | 5-7,0-6 |
| ITF M15 Duffel | 2023/06/12 10:00 | Hornitschek, Nico v Schlagenhauf, Noah | 5-7,6-7 |
| ITF M15 Duffel | 2023/06/11 12:30 | Muller, Rik v Schlagenhauf, Noah | 6-7,7-6,6-10 |
| Sarajevo, Singles Main, M-ITF-BIH-05A | 2023/06/07 07:00 | Schlagenhauf, Noah v 주카스, 마티아스 | 1-6,5-7 |
| Sarajevo, Singles Main, M-ITF-BIH-05A | 2023/06/06 07:45 | Nino Toto v Schlagenhauf, Noah | 2-6,2-6 |