| Polish Int. | 2019/09/21 09:55 | Ivan Rusev v Leon Seiwald | L | 2-0 |
| Polish Int. | 2019/09/20 10:20 | Leon Seiwald v Joonas Korhonen | W | 2-1 |
| Belgian Int. | 2019/09/12 13:00 | Luis Enrique Penalver v Leon Seiwald | L | 2-1 |
| Kharkiv Int. Qual | 2019/09/04 11:30 | Leon Seiwald v Gergo Pytel | L | 1-2 |
| Belarus Int. | 2019/08/30 10:40 | Raul Must v Leon Seiwald | L | 2-1 |
| Slovenia Int. Qual | 2019/05/15 08:30 | Leon Seiwald v B.M. Rahul Bharadwaj | L | 0-2 |
| Swiss Open WD Qual | 2019/02/21 09:10 | Bobby Setiabudi v Leon Seiwald | L | 2-0 |
| Swiss Open WD Qual | 2018/12/13 13:45 | Mikkel Enghoj v Leon Seiwald | W | 0-1 |
| Polish Int. | 2019/09/20 13:40 | Daniel Nikolov v Mateusz Dubowski | L | 2-1 |
| Polish Int. Qual | 2019/09/19 16:20 | Mateusz Dubowski v Nikolaj Mangor | W | 2-0 |
| Polish Int. Qual | 2019/09/19 12:50 | Martin Bundgaard v Mateusz Dubowski | W | 0-2 |
| Polish Int. Qual | 2019/09/19 09:20 | Mateusz Dubowski v Gasper Krivec | W | 2-0 |
| Belarus Int. Qual | 2019/08/30 07:40 | Mateusz Dubowski v Evgeny Chertilin | W | 2-0 |
| Belarus Int. Qual | 2019/08/29 11:00 | Mateusz Dubowski v Oleksandr Kolesnik | W | 2-0 |
| Hellas Open | 2019/08/09 12:30 | Gergely Krausz v Mateusz Dubowski | L | 2-0 |
| Lithuanian Int. Qual | 2019/06/07 06:00 | Brian Holtschke v Mateusz Dubowski | W | 0-2 |