Stadium: Court 1 Round: 54 Ground: Hardcourt outdoor
| ITF M15 Allershausen | 2023/08/31 10:00 | Mark Wallner v Daniel De Jonge | 5-7,2-6 |
| ITF M15 Allershausen | 2023/08/30 12:00 | Mark Wallner v Lawrence Sciglitano | 6-3,6-2 |
| ITF M15 Allershausen | 2023/08/30 08:00 | Karlo Cubelic v Mark Wallner | 6-3,2-6,7-10 |
| ITF M15 Uberlingen | 2023/08/17 08:00 | Mark Wallner v Fnu Nidunjianzan | 4-6,6-4,3-6 |
| ITF M15 Uberlingen | 2023/08/16 08:00 | Gregor Ramskogler v Mark Wallner | 3-6,2-6 |
| ITF M15 Uberlingen | 2023/08/14 08:00 | Daniel L Salmeron v Mark Wallner | 1-6,6-7 |
| ITF M15 Frankfurt Am Main | 2023/08/07 16:00 | Gregor Ramskogler v Mark Wallner | 6-4,7-5 |
| ITF M15 Frankfurt Am Main | 2023/08/07 10:00 | Mark Wallner v Giuseppe La Vela | 6-4,7-5 |