Stadium: Court 2 Round: 28 Ground: Clay
| ITF M15 Eupen | 2023/08/11 09:00 | Cesar Bouchelaghem v Peter Heller | 2-6,0-6 |
| ITF M15 Eupen | 2023/08/10 09:00 | Abel Forger v Peter Heller | 2-6,3-6 |
| ITF M15 Eupen | 2023/08/09 13:00 | Brian Bozemoj v Peter Heller | 4-6,1-6 |
| Challenger San Marino | 2023/07/30 10:25 | Peter Heller v Marcello Serafini | 4-6,4-6 |
| ITF M25 Kramsach | 2023/07/28 09:00 | Oliver Crawford v Peter Heller | 6-3,6-4 |
| ITF M25 Kramsach | 2023/07/27 13:45 | Kai Wehnelt v Peter Heller | 5-7,4-6 |
| ITF M25 Kramsach | 2023/07/26 10:00 | Peter Heller v Alex Barrena | 6-3,3-6,6-1 |
| ITF M25 Telfs | 2023/07/22 08:00 | Peter Heller v Buvaysar Gadamauri | 6-2,1-6,4-6 |
| ITF M15 Eupen | 2023/08/11 16:30 | Luca Wiedenmann v Marc Majdandzic | 4-6,7-5,3-6 |
| ITF M15 Eupen | 2023/08/10 17:00 | Pierre Yves Bailly v Marc Majdandzic | 6-3,4-6,1-6 |
| ITF M15 Eupen | 2023/08/09 12:20 | Marc Majdandzic v Jose Pereira | 4-6,6-1,7-6 |
| Challenger Braunschweig | 2023/07/09 14:15 | Marc Majdandzic v Denis Yevseyev | 3-6,4-6 |
| ITF M15 Kamen | 2023/06/29 08:50 | Tom Gentzsch v Marc Majdandzic | 6-3,4-6,7-6 |
| ITF M15 Kamen | 2023/06/27 09:00 | Marc Majdandzic v Kody Pearson | 6-4,6-3 |