| Slovak Open - Kwal. | 04/17 14:35 | - | Tauri Kilk v Leon Seiwald | L | 2-0 | |
| Slovak Open - Kwal. | 04/17 07:45 | - | Leon Seiwald v James Robertson | W | 2-0 | |
| Austrian Open - Kwal. | 05/27 09:40 | - | Jan Janostik v Leon Seiwald | - | Retired | |
| EK badminton gemengde teams | 12/10 17:30 | - | Milan Ludik v Leon Seiwald | W | 0-2 | |
| SaarLorLux Open | 10/27 09:00 | 6 | Leon Seiwald v Kim Bruun | L | 0-2 | |
| Slovak Open | 02/27 15:30 | - | Jan Louda v Leon Seiwald | L | 2-0 | |
| Austrian Open - Kwal. | 02/19 12:15 | - | Leon Seiwald v Rahul Yadav Chittaboina | L | 1-2 | |
| EK teams | 02/13 18:00 | - | Leon Seiwald v Joshua Magee | W | 2-1 | |
| EK teams | 02/12 19:00 | - | Leon Seiwald v Mateusz Dubowski | W | 2-1 | |
| Scottish Open - Kwal. | 11/21 12:40 | - | Christo Popov v Leon Seiwald | L | 2-0 | |
| Scottish Open - Kwal. | 11/21 10:00 | - | Leon Seiwald v Sam Parsons | W | 2-1 | |
| Irish Open - Kwal. | 11/13 14:30 | - | Daniel Nikolov v Leon Seiwald | L | 2-0 |