| Croatia Open | 2022/06/20 17:40 | Ming Hong Lim v Justin Seibel | L | 2-0 |
| Bonn Int. Qual | 2022/06/15 08:30 | Justin Hoh v Justin Seibel | L | 2-0 |
| Luxembourg Open Qual | 2022/05/05 08:20 | Martin Ouazzen v Justin Seibel | L | 2-0 |
| Italian Int. Qual | 2021/12/16 12:04 | Sacha Leveque v Justin Seibel | L | 2-0 |
| Slovenia Future Series Qual | 2021/11/25 10:10 | Ludvig Petre Olsson v Justin Seibel | L | 2-0 |
| Cyprus Int. Qual | 2021/10/14 12:00 | Justin Seibel v Magnus Bach Kristensen | L | 0-2 |
| Cyprus Int. Qual | 2021/10/14 09:30 | Justin Seibel v Balazs Papai | W | 2-0 |
| Hellas Int. Qual | 2021/09/02 08:00 | Justin Seibel v Marios Michail Boulios | W | 2-0 |