Stadium: Court 4 Round: 25 Ground: Clay
| ITF M25 Kassel | 2023/07/11 11:10 | Milan Welte v Stepan Mruzek | 6-2,6-1 |
| ITF M25 Kassel | 2023/07/10 13:05 | Milan Welte v Bengt Johan Reinhard | 6-0,6-0 |
| ITF M25 Marburg | 2023/07/05 09:00 | Milan Welte v Dominik Recek | 1-6,1-6 |
| ITF M15 Saarlouis | 2023/06/20 16:00 | Joao Fonseca v Milan Welte | 7-5,7-5 |
| ITF M15 Saarlouis | 2023/06/19 09:30 | Milan Welte v Maximilian Homberg | 6-3,6-1 |
| ITF M15 Saarlouis | 2023/06/18 09:00 | Milan Welte v Aaron James Williams | 6-4,7-6 |
| ITF M15 Creteil | 2023/03/07 16:40 | Daniil Glinka v Milan Welte | 7-6,6-1 |
| ITF M15 Creteil | 2023/03/06 09:55 | Leo Raquillet v Milan Welte | 3-6,4-6 |
| Challenger Milan | 2023/07/02 12:05 | Lucio Carnevalle v Robert Strombachs | 7-5,7-6 |
| Challenger Poznan | 2023/06/18 08:30 | Robert Strombachs v Sebastian Gima | 3-6,5-7 |
| Challenger Perugia | 2023/06/11 12:45 | Renzo Olivo v Robert Strombachs | 6-4,6-1 |
| ITF M25 Cordoba | 2023/06/09 08:00 | Robert Strombachs v Georgii Kravchenko | 5-7,0-6 |
| Challenger Troisdorf | 2023/06/02 16:10 | Pavel Kotov v Robert Strombachs | 2-6,6-3,6-4 |
| Challenger Troisdorf | 2023/06/01 10:30 | Hernan Casanova v Robert Strombachs | 4-6,0-6 |
| Challenger Troisdorf | 2023/05/30 08:00 | Robert Strombachs v Jozef Kovalik | 7-5,7-6 |
| Challenger Troisdorf | 2023/05/29 08:30 | Sumit Nagal v Robert Strombachs | 1-6,6-7 |