Stadium: Court 5 Round: 62 Ground: Hardcourt outdoor
| 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 |
| ITF M25 Laval | 2023/07/09 14:00 | Stefano Liokossis v Maxime St-Hilaire | 4-6,0-6 |
| UTR Pro Florida | 2023/07/06 16:11 | Nikolay Sysoev v Stefano Liokossis | 6-2,5-1 |
| UTR Pro Florida | 2023/07/05 20:00 | Stefano Liokossis v Luke Casper | 6-3,3-6,1-6 |
| UTR Pro Florida | 2023/07/04 12:00 | Stefano Liokossis v Matija Pecotic | 2-6,2-6 |
| ITF M25 Santo Domingo | 2023/06/28 13:30 | Yannik Rahman v Stefano Liokossis | 6-2,6-3 |
| ITF M25 Santo Domingo | 2023/06/27 15:40 | Fabian Hansch Mauritzson v Stefano Liokossis | 4-6,2-6 |
| ITF M25 Santo Domingo | 2023/06/26 13:30 | Yohandri P Garcia v Stefano Liokossis | 3-6,1-6 |
| ITF M25 Santo Domingo | 2023/06/20 13:00 | Stefano Liokossis v David Krasner | 0-6,1-6 |