| TT Cup (2023) | 06/10 15:20 | - | Zdenek Bron v Karel Kastner | L | 3-1 | |
| TT Cup (2023) | 06/10 14:50 | - | Pavel Vilhelm v Karel Kastner | L | 3-2 | |
| TT Cup (2023) | 06/04 13:20 | - | Karel Kastner v Zdenek Bron | W | 3-2 | |
| TT Cup (2023) | 06/04 12:20 | - | Karel Kastner v Zdenek Bron | W | 3-2 | |
| TT Cup (2023) | 06/04 11:20 | - | Karel Kastner v David Mutl | L | 2-3 | |
| TT Cup (2023) | 06/04 10:20 | - | Karel Kastner v Vladimir Libovicky | L | 1-3 | |
| TT Cup (2023) | 05/09 17:20 | - | David Mutl v Karel Kastner | W | 1-3 | |
| TT Cup (2023) | 05/09 16:20 | - | Jakub Jares v Karel Kastner | L | 3-0 | |
| TT Cup (2023) | 05/09 15:50 | - | David Mutl v Karel Kastner | L | 3-1 | |
| TT Cup (2023) | 05/09 14:50 | - | Karel Kastner v Ivo Hladik | W | 3-1 | |
| TT Cup (2023) | 04/29 21:20 | - | Zdenek Bron v Karel Kastner | L | 3-2 | |
| TT Cup (2023) | 04/29 20:50 | - | Karel Kastner v Pavel Vyvial | L | 0-3 | |
| TT Cup (2023) | 04/29 19:20 | - | Zdenek Bron v Karel Kastner | L | 3-1 | |
| TT Cup (2023) | 04/29 18:50 | - | Vlastimil Kocvara v Karel Kastner | W | 2-3 | |
| TT Cup (2023) | 04/15 09:50 | - | Karel Kastner v Jan Zalesky | W | 3-1 | |
| TT Cup (2023) | 04/15 08:20 | - | Jakub Jares v Karel Kastner | L | 3-1 | |
| TT Cup (2023) | 04/15 07:50 | - | Jan Zalesky v Karel Kastner | W | 2-3 | |
| TT Cup (2023) | 04/15 06:50 | - | Karel Kastner v David Mutl | W | 3-0 | |
| TT Cup (2023) | 04/02 09:20 | - | Jan Zalesky v Karel Kastner | L | 3-1 | |
| TT Cup (2023) | 04/02 08:20 | - | Karel Kastner v Jan Zalesky | L | 2-3 | |
| TT Cup (2023) | 04/02 07:20 | - | Karel Kastner v Roman Urban | L | 0-3 | |
| TT Cup (2023) | 04/02 06:20 | - | Karel Kastner v Zdenek Bron | L | 1-3 | |
| TT Cup (2023) | 03/20 18:50 | - | Tomas Cerveny Jnr v Karel Kastner | L | 3-1 | |
| TT Cup (2023) | 03/20 17:50 | - | Karel Kastner v Tomas Cerveny Jnr | L | 1-3 | |
| TT Cup (2023) | 03/20 16:20 | - | David Mutl v Karel Kastner | W | 1-3 | |
| TT Cup (2023) | 03/20 15:50 | - | Vlastimil Kocvara v Karel Kastner | W | 1-3 | |
| TT Cup (2023) | 03/19 10:20 | - | Jan Spiegel v Karel Kastner | W | 2-3 | |
| TT Cup (2023) | 03/19 09:20 | - | David Mutl v Karel Kastner | L | 3-2 | |
| TT Cup (2023) | 03/19 08:50 | - | Jan Zalesky v Karel Kastner | W | 2-3 | |
| TT Cup (2023) | 03/19 07:50 | - | Karel Kastner v Jan Spiegel | L | 0-3 |