| Bulgarian International | 2021/10/08 08:55 | Nicolas A. Mueller v Brian Holtschke | L | 0-2 |
| Lithuanian International | 2023/06/10 09:05 | Nicolas A. Mueller v Iikka Heino | W | 2-1 |
| Austrian Open - Qualifikation | 2023/05/25 11:05 | Nicolas A. Mueller v Eogene Ewe | L | 0-2 |
| Swedish Open - Qualifikation | 2023/05/11 19:15 | Panji Ahmad Maulana v Nicolas A. Mueller | L | 2-0 |
| Swedish Open - Qualifikation | 2023/05/11 15:45 | Nicolas A. Mueller v Albin Carl Hjelm | W | 2-0 |
| Swedish Open - Qualifikation | 2023/05/11 09:55 | Mykhailo Vyshnevyi v Nicolas A. Mueller | W | 0-2 |
| Luxembourg Open - Qualifikation | 2023/05/04 09:30 | Yu Huang v Nicolas A. Mueller | L | 2-0 |
| Swiss Open - Qualifikation | 2023/03/21 10:40 | Joran Kweekel v Nicolas A. Mueller | L | 2-0 |
| Portugal International - Qualifikation | 2023/03/09 16:00 | Gregoire Deschamp v Nicolas A. Mueller | L | 2-0 |
| Lithuanian International | 2023/06/10 09:05 | Brian Holtschke v Tino Daoudal | W | 2-1 |
| Lithuanian International | 2023/06/09 12:40 | Harry Huang v Brian Holtschke | W | 1-2 |
| Bonn Int. | 2023/06/02 08:10 | Henrikho Kho Wibowo v Brian Holtschke | L | 2-0 |
| Bonn Int. | 2023/06/01 12:00 | Brian Holtschke v Amaury Lievre | W | 2-1 |
| Austrian Open - Qualifikation | 2023/05/25 10:20 | Brian Holtschke v Tino Daoudal | L | 0-2 |
| Slovenia Open - Qualifikation | 2023/05/18 07:20 | Brian Holtschke v Chen Xun Zhao | L | 1-2 |
| Slovenia Open - Qualifikation | 2023/05/17 14:35 | Rune Van Dalm v Brian Holtschke | W | 0-2 |
| Slovenia Open - Qualifikation | 2023/05/17 07:00 | Brian Holtschke v Yanis Gaudin | W | 2-0 |