Stadium: Rado Center Court Round: 54 Ground: Clay
| ITF - M15 Monastir | 2023/04/05 12:35 | Zhan Zheng v Jonas Schaer | 2-6,6-4,6-1 |
| ITF - M15 Monastir | 2023/04/04 12:30 | Jonas Schaer v Aaron Gil Garcia | 3-6,7-6,12-10 |
| ITF - M15 Monastir | 2023/03/27 15:55 | Jonas Schaer v Federico Salomone | 3-6,0-6 |
| ITF - M15 Monastir | 2023/03/27 08:30 | Jonas Schaer v Youssef Labbene | 7-6,4-6,10-2 |
| ITF - M15 Monastir | 2023/03/26 08:30 | Jonas Schaer v Oleg Syrovatskiy | 6-0,6-3 |
| Challenger Biel | 2023/03/19 10:45 | Jonas Schaer v Saba Purtseladze | 6-4,3-6,2-6 |
| ITF - M25 Trimbach | 2023/03/16 12:35 | Neil Oberleitner v Jonas Schaer | 7-6,6-3 |
| ITF - M25 Trimbach | 2023/03/15 14:25 | Bachinger, Matthias v Jonas Schaer | 3-6,6-0,3-6 |
| 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 | van Emburgh, Jake 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 | Almeida, Tomas v Thomas Mathys | 5-7,4-6 |
| ITF M25 Klosters | 2023/07/02 12:35 | Thomas Mathys v Raffael Schaer | 3-6,4-6 |
| ITF - M15 Monastir | 2023/04/16 08:00 | Thomas Mathys v Adrian Arcon | 3-6,3-6 |
| ITF - M15 Monastir | 2023/04/09 08:00 | Dusan Baranec v Thomas Mathys | 6-2,6-0 |
| ITF - M15 Monastir | 2023/03/01 08:30 | Thomas Mathys v Federico Arnaboldi | 2-6,2-6 |