Stadium: Court 1 Round: 26 Ground: Hardcourt indoor
| ITF M25 Esch/Alzette | 2023/07/12 09:45 | Stijn Slump v Kai Wehnelt | 1-6,6-3,3-6 |
| ITF M25 The Hague | 2023/07/05 14:05 | Kai Wehnelt v Sander Jong | 1-6,2-6 |
| Challenger - Poznan | 2023/06/19 09:00 | Rudolf Molleker v Kai Wehnelt | 6-4,6-4 |
| Challenger - Poznan | 2023/06/18 08:30 | Kai Wehnelt v Kalin Ivanovski | 6-3,3-6,6-3 |
| ITF M15 Nyíregyháza | 2023/06/07 08:00 | Peter Nad v Kai Wehnelt | 6-4,1-6,6-3 |
| ITF M25 Reggio Emilia | 2023/05/19 09:00 | Julian Ocleppo v Kai Wehnelt | 6-4,3-6,6-2 |
| ITF M25 Reggio Emilia | 2023/05/17 10:00 | Gian Marco Ortenzi v Kai Wehnelt | 0-6,2-6 |
| ITF M25 Reggio Emilia | 2023/05/15 16:30 | Kai Wehnelt v Federico Marchetti | 6-1,6-0 |
| ITF M25 Esch/Alzette | 2023/07/12 09:45 | Fons Van Sambeek v Alex Knaff | 3-6,4-6 |
| ITF M25 Arlon | 2023/06/30 09:00 | Tibo Colson v Alex Knaff | 7-6,6-4 |
| ITF M25 Arlon | 2023/06/29 09:50 | Raphael Calzi v Alex Knaff | 2-6,1-6 |
| ITF M25 Arlon | 2023/06/28 10:35 | Alex Knaff v Mathys Erhard | 7-6,6-4 |
| ITF M15 Saarlouis | 2023/06/22 12:30 | Sander Jong v Alex Knaff | 6-4,6-3 |
| ITF M15 Saarlouis | 2023/06/21 11:20 | Masato Perera v Alex Knaff | 2-6,3-6 |
| ITF M15 Duffel | 2023/06/13 10:00 | Alex Knaff v Michiel de Krom | 6-7,3-6 |
| ITF M15 Pazardzhik | 2023/05/26 07:00 | Leonardo Rossi v Alex Knaff | 6-1,6-3 |