Stadium: Court 3 Round: 25 Ground: Clay
| ITF M25 Kottingbrunn | 2022/07/25 07:30 | Jonas Trinker v Niklas Waldner | 4-6,3-6 |
| 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 |
| ITF M15 Kursumlijska Banja | 2023/04/24 07:00 | Aljaz Jeran v Niklas Waldner | 6-4,6-4 |
| ITF M25 Opatija | 2023/03/21 13:30 | Andrej Nedic v Niklas Waldner | 7-5,6-4 |
| ITF M25 Opatija | 2023/03/21 09:00 | Ivan Kremenchutskyi v Niklas Waldner | 6-4,3-6,8-10 |
| ITF M15 Celje | 2023/06/29 10:50 | Jonas Trinker v Bor Artnak | 4-6,3-6 |
| ITF M15 Celje | 2023/06/28 14:15 | Jonas Trinker v Admir Kalender | 6-1,6-4 |
| ITF M15 Celje | 2023/06/27 09:30 | Jonas Trinker v Aljaz Jeran | 6-7,4-6 |
| ITF M15 Celje | 2023/06/26 10:20 | Jonas Trinker v Michelangelo Z F Mreule | 6-2,6-1 |
| ITF M15 Cluj Napoca | 2023/06/21 08:30 | Radu Mihai Papoe v Jonas Trinker | 6-7,6-1,6-3 |
| ITF M15 Cluj Napoca | 2023/06/20 09:10 | Jonas Trinker v Bogdan Pavel | 6-3,6-3 |
| ITF M15 Litija | 2023/06/14 13:55 | Jonas Trinker v Peter Goldsteiner | 2-6,4-6 |
| ITF M15 Vaasa | 2023/06/07 11:00 | Jonas Trinker v Leonardo Rossi | 2-6,4-6 |