| Hellas International | 2021/09/03 10:05 | Nicolas A. Mueller v Shahyar Shaqeem | L | 1-2 |
| Lettland - Latvia International | 2021/08/28 08:00 | Joonas Korhonen v Nicolas A. Mueller | L | 2-0 |
| Lettland - Latvia International | 2021/08/27 12:30 | Nicolas A. Mueller v Valentin Singer | W | 2-1 |
| Dänemark - Denmark Masters - Qualifikation | 2021/08/05 14:00 | Elias Bracke v Nicolas A. Mueller | L | 2-0 |
| Spain International - Qualifikation | 2021/06/16 11:00 | Nicolas A. Mueller v Jonas Jaeger | L | 0-2 |
| Spain International - Qualifikation | 2021/06/16 10:40 | Nicolas A. Mueller v Adrian Alvarez | W | 2-0 |
| Lithuanian International | 2021/06/12 15:45 | Nicolas A. Mueller v Alex Lanier | L | 0-2 |
| Lithuanian International | 2021/06/12 06:45 | Nicolas A. Mueller v Axel Henrik Parkhøi | W | 2-0 |
| Ukraine International | 2021/09/08 08:40 | Mithun Manjunath v Brian Holtschke | L | 2-0 |
| Hellas International | 2021/09/03 12:25 | Brian Holtschke v Wyman Goh | L | 0-2 |
| Dänemark - Denmark Masters - Qualifikation | 2021/08/05 07:00 | Gergo Pytel v Brian Holtschke | L | 2-0 |
| Spain International - Qualifikation | 2021/06/17 07:40 | Misbun Ramdan Mohmed Misbun v Brian Holtschke | L | 2-0 |
| Spain International - Qualifikation | 2021/06/16 10:40 | Martin Ouazzen v Brian Holtschke | W | 0-2 |
| Austrian Open - Qualifikation | 2021/05/28 07:30 | Brian Holtschke v Alex Lanier | L | 0-2 |
| Austrian Open - Qualifikation | 2021/05/27 14:55 | Brian Holtschke v Gustav Andree | W | 2-0 |
| Austrian Open - Qualifikation | 2021/05/27 08:50 | Erik Seiwald v Brian Holtschke | W | 0-2 |