Stadium: Court 4 Round: 25 Ground: Carpet indoor
| ITF M15 Santo Domingo | 2023/11/14 15:30 | Alberto Puello v Tim Ruehl | 4-6,2-6 |
| ITF M15 Santo Domingo | 2023/11/08 16:30 | Leonardo Civita-Telles v Tim Ruehl | 6-0,5-7,6-3 |
| ITF M15 Arad | 2023/09/26 06:30 | Tim Ruehl v Stefan A Andreescu | 2-6,6-3,6-7 |
| ITF M15 Arad | 2023/09/25 09:30 | Tim Ruehl v Mykyta Riepkin | 6-2,6-1 |
| ITF M15 Koszalin | 2023/09/07 10:00 | Dominik Kellovsky v Tim Ruehl | 6-1,3-6,6-3 |
| ITF M15 Koszalin | 2023/09/06 11:10 | Philipp Pavlenko v Tim Ruehl | 0-6,7-6,2-6 |
| ITF M15 Allershausen | 2023/09/01 11:50 | Tim Ruehl v Nicola Kuhn | 6-3,6-7,3-6 |
| ITF M15 Allershausen | 2023/08/31 10:00 | Diego Dedura-Palomero v Tim Ruehl | 3-6,3-6 |
| ITF M15 Buschhausen | 2023/09/11 08:00 | Aaron Funk v Noel Larwig | 2-6,4-6 |
| ITF M15 Trier | 2023/08/23 12:40 | Tom Schonenberg v Aaron Funk | 4-6,6-3,6-4 |
| ITF M15 Frankfurt Am Main | 2023/08/07 08:00 | Aaron Funk v Davud Amirov | 6-3,6-2 |
| German Championship | 2022/12/04 11:00 | Aaron Funk v Piet Steveker | 3-6,6-4,1-0 |