| Bulgarian Int. - Kval | 2022/10/06 07:00 | Theodoros Papadopoulos v Evgeni Uzunov | W | 1-2 |
| Bulgarian Int. - Kval | 2022/10/06 07:00 | Marian Liptak v Justin Seibel | W | 0-2 |
| Kroatien Int. - Kval | 2022/09/29 11:40 | Matthias Kicklitz v Justin Seibel | L | 2-0 |
| Croatia Open | 2022/06/20 17:40 | Ming Hong Lim v Justin Seibel | L | 2-0 |
| Bonn Int. - Kval | 2022/06/15 08:30 | Justin Hoh v Justin Seibel | L | 2-0 |
| Luxembourg Open - Kval | 2022/05/05 08:20 | Martin Ouazzen v Justin Seibel | L | 2-0 |
| Italian Int. - Kval | 2021/12/16 12:04 | Sacha Leveque v Justin Seibel | L | 2-0 |
| Slovenien - Future Series - Kval | 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 |