Stadium: Court 2 Round: 25 Ground: Clay
| 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 - Medellín | 2023/06/27 16:55 | Alex Barrena v Gonzalo Lama | 7-6,4-6,4-6 |
| Challenger - Cali | 2023/06/19 16:00 | Alex Barrena v Juan Ignacio Londero | 2-6,4-6 |
| Challenger - Cali | 2023/06/18 19:10 | Alex Barrena v Nicolas Buitrago | 6-2,6-4 |
| Challenger - Salzburg | 2023/07/09 08:30 | Niklas Waldner v Mohamed Safwat | 3-6,5-7 |
| ITF M25 - Klosters | 2023/07/06 08:40 | Niklas Waldner v Damien Wenger | 1-6,2-6 |
| ITF M25 - Klosters | 2023/07/05 11:00 | Niklas Waldner v Jonas Trinker | 7-6,6-3 |
| ITF M25 - Klosters | 2023/07/03 12:10 | Niklas Waldner v Laurin Aerne | 2-6,7-5,10-5 |
| ITF - M15 Celje | 2023/06/26 10:55 | Maurus Malgiaritta v Niklas Waldner | 6-4,6-4 |
| ITF - M15 Warmbad-Villach | 2023/05/21 10:00 | Aljaz Jeran v Niklas Waldner | 6-2,6-3 |
| ITF - M15 Kursumlijska Banja | 2023/05/02 09:00 | Viktor Jovic v Niklas Waldner | 6-1,6-3 |
| ITF - M15 Kursumlijska Banja | 2023/05/01 07:00 | Dmitrii Vasilev v Niklas Waldner | 6-3,1-6,7-10 |