| Giraldilla Int. XD | 08/30 07:00 | 1 | Leon Seiwald v Jaromir Janacek | W | 2-0 | |
| Swiss Open - Kvinnedouble - Kval | 05/10 08:00 | 1 | Leon Seiwald v Sebastian Bugtrup | L | 1-2 | |
| Swiss Open - Kvinnedouble - Kval | 03/08 11:30 | 1 | Marcus Loo v Leon Seiwald | W | 1-2 | |
| Swiss Open - Kvinnedouble - Kval | 02/21 10:40 | 1 | David Peng v Leon Seiwald | L | 2-1 | |
| Swiss Open - Kvinnedouble - Kval | 12/05 14:26 | - | Leon Seiwald v Peter Correl | L | 1-2 | |
| Indonesia Masters - Mixed double | 05/22 02:20 | 1 | Zin Rei Ryan Ng v Leon Seiwald | L | 2-1 | |
| Giraldilla Int. XD | 03/09 21:47 | - | Douglas Lidman v Leon Seiwald | L | 2-0 |