Stadium: Hard 21 Round: 62 Ground: Hardcourt outdoor
| ITF M25 Sion | 2023/08/28 17:25 | Thomas Mathys v Stepan Pecak | 2-6,2-6 |
| ITF M25 Sion | 2023/08/27 14:15 | Batiste Guerra v Thomas Mathys | 1-6,2-6 |
| ITF M15 Caslano | 2023/08/20 14:50 | Lorenzo Vatteroni v Thomas Mathys | 6-0,6-1 |
| ITF M25 Muttenz | 2023/08/14 14:00 | Jonas Schaer v Thomas Mathys | 6-3,5-7,10-4 |
| ITF M15 Xativa | 2023/07/30 07:00 | Thomas Mathys v Sam K Baumgartner | 3-6,1-6 |
| ITF M25 Porto | 2023/07/25 11:40 | Jake Van Emburgh v Thomas Mathys | 6-0,6-4 |
| ITF M25 Porto | 2023/07/24 13:30 | Thomas Mathys v Rodrigo Beires | 6-1,6-1 |
| ITF M25 Porto | 2023/07/23 12:00 | Tomas Almeida v Thomas Mathys | 5-7,4-6 |
| ITF M15 Pirot | 2023/09/04 10:00 | Lazar Vojinovic v Nazar Oliynykov | 6-3,6-3 |
| ITF M15 Pirot | 2023/09/03 11:30 | Shendrit Deari v Nazar Oliynykov | 3-6,6-3,8-10 |
| ITF M25 Osijek | 2023/08/07 12:15 | Nazar Oliynykov v Jaka Protic Zakelj | 1-6,5-7 |
| ITF M25 Osijek | 2023/08/06 10:00 | Peter Nad v Nazar Oliynykov | 2-6,6-1,5-10 |
| ITF M15 Novi Sad | 2023/08/01 11:35 | Sergei Pogosian v Nazar Oliynykov | 6-1,6-2 |
| ITF M15 Novi Sad | 2023/08/01 07:30 | Nazar Oliynykov v Marko Andrejic | 7-5,6-1 |
| ITF M15 Novi Sad | 2023/07/25 09:35 | Pavel Verbin v Nazar Oliynykov | 6-1,6-3 |
| ITF M15 Novi Sad | 2023/07/24 11:05 | Nazar Oliynykov v Radomir Tomic | 7-5,6-2 |