| UTR Pro Olomouc | 2023/09/11 06:00 | Robert Rumler v Petr Michnev | 1-6,4-6 |
| ITF M25 Maribor | 2023/08/30 12:00 | Robert Rumler v Nicolas Zanellato | 0-6,2-6 |
| ITF M25 Maribor | 2023/08/29 10:55 | Robert Rumler v Maks Meh | 1-6,6-0,10-6 |
| ITF M25 Maribor | 2023/08/28 11:25 | Robert Rumler v Marko Novak | 6-1,6-3 |
| UTR Pro Olomouc | 2023/07/08 08:06 | Dominik Suc v Robert Rumler | 6-4,7-6 |
| UTR Pro Olomouc | 2023/07/07 06:00 | Alessandro-D Ventre v Robert Rumler | 6-3,2-6,4-5 |
| UTR Pro Olomouc | 2023/07/06 10:00 | Jan Jermar v Robert Rumler | 6-3,6-4 |
| UTR Pro Olomouc | 2023/07/05 07:30 | Jonasz Dziopak v Robert Rumler | 1-6,6-7 |
| UTR Pro Olomouc | 2023/09/11 07:30 | Matthew William Donald v Mikolaj Lis | 6-1,5-3 |
| ITF M15 Wien | 2023/09/01 08:00 | Matthew William Donald v Peter Heller | 2-6,3-6 |
| ITF M15 Wien | 2023/08/31 12:05 | Matthew William Donald v Tomas Lanik | 6-4,6-4 |
| ITF M15 Ueberlingen | 2023/08/16 08:00 | Matthew William Donald v Aleksandre Metreveli | 6-4,1-6,4-6 |
| ITF M15 Frankfurt Am Main | 2023/08/08 09:00 | Kai Lemstra v Matthew William Donald | 6-3,6-1 |
| ITF M15 Monastir | 2023/07/28 08:30 | Kris Van Wyk v Matthew William Donald | 6-1,6-4 |
| ITF M15 Monastir | 2023/07/27 10:25 | Matthew William Donald v Dylan Salton | 6-1,6-1 |
| ITF M15 Monastir | 2023/07/26 10:00 | Matthew William Donald v Gabriele Bosio | 4-6,6-2,6-3 |