Stadium: Court 8 Round: 25 Ground: Clay
| ITF M25 Telfs | 2023/07/22 08:00 | Peter Heller v Buvaysar Gadamauri | 6-2,1-6,4-6 |
| ITF M25 Telfs | 2023/07/21 12:00 | Peter Heller v Daniel Siniakov | 6-1,6-0 |
| ITF M25 Telfs | 2023/07/20 09:45 | Peter Heller v Ondrej Horak | 6-1,6-1 |
| ITF M25 Telfs | 2023/07/18 10:00 | Peter Heller v Niklas Schell | 6-3,6-1 |
| ITF M15 Antalya | 2023/04/21 07:30 | Viacheslav Bielinskyi v Peter Heller | 6-7,6-0,6-3 |
| ITF M15 Antalya | 2023/04/20 07:00 | Atakan Karahan v Peter Heller | 1-6,0-6 |
| ITF M15 Antalya | 2023/04/19 07:00 | Marsel Ilhan v Peter Heller | 5-7,1-6 |
| ITF M15 Antalya | 2023/04/05 09:55 | Michel Hopp v Peter Heller | 1-6,4-6 |
| ITF M25 Telfs | 2023/07/20 08:55 | Alex Barrena v Kai Wehnelt | 6-3,6-1 |
| ITF M25 Telfs | 2023/07/19 09:55 | Alex Barrena v Niklas Waldner | 6-4,6-4 |
| Challenger Salzburg | 2023/07/12 09:00 | Juan Manuel Cerundolo v Alex Barrena | 6-2,4-6,6-1 |
| Challenger Salzburg | 2023/07/11 11:15 | Alex Barrena v Akira Santillan | 6-3,6-0 |
| Challenger Salzburg | 2023/07/10 09:00 | Peter Gojowczyk v Alex Barrena | 3-6,3-6 |
| Challenger Salzburg | 2023/07/09 10:50 | Matthias Ujvary v Alex Barrena | 2-6,3-6 |
| ITF M25 Marburg | 2023/07/05 16:40 | Alex Barrena v Adrian Oetzbach | 6-7,5-7 |
| Challenger Medellin | 2023/06/26 22:20 | Alex Barrena v Gonzalo Lama | 7-6,4-6,4-6 |