| Estonian Int. Qual | 01/08 10:20 | - | Hsin Tse Tu v Justin Seibel | L | 2-0 | |
| Turkiye Int. | 11/20 08:00 | - | Emil Dantler v Justin Seibel | L | 2-1 | |
| Czech Open | 10/16 09:00 | - | Justin Seibel v Maksymilian Danielak | L | 1-2 | |
| Bulgarian Int. | 10/03 06:55 | - | Matthew Waring v Justin Seibel | L | 2-0 | |
| Croatian Int. | 09/26 07:55 | - |
Orijit Chaliha
v
Justin Seibel |
L | 2-0 | |
| Slovenia Future Series Qual | 09/04 15:35 | - | Justin Seibel v Sid Palakkal | L | 0-2 | |
| Slovenia Future Series Qual | 09/04 10:05 | - |
Jamie Pearcy
v
Justin Seibel |
W | 0-2 | |
| Slovenia Future Series Qual | 09/03 17:35 | - | Justin Seibel v Heng Lin Ngan | W | 2-0 | |
| Slovenia Future Series Qual | 09/03 10:25 | 6 | Justin Seibel v Marton Szerecz | W | 2-1 | |
| Czech Int. | 06/21 10:10 | - | Han Jin Ding v Justin Seibel | - | Cancelled | |
| Czech Int. | 06/20 12:35 | - |
Justin Seibel v
Collins Valentine Filimon
|
L | 0-2 | |
| Latvia Int. Qual | 06/12 08:15 | - | Justin Seibel v Christian Tomic | L | 1-2 | |
| Bonn Int. | 05/28 13:35 | - | Tim Mork v Justin Seibel | L | 2-1 | |
| Bonn Int. | 05/28 09:00 | - | Brent Stockman v Justin Seibel | W | 0-2 | |
| Austrian Open Qual | 05/22 10:35 | - | Justin Seibel v Enrico Baroni | L | 0-2 | |
| Luxembourg Open Qual | 05/01 07:55 | - | Justin Seibel v Paul Tournefier | L | 1-2 | |
| Malta Int. | 04/24 11:10 | - | David Silva v Justin Seibel | L | 2-0 | |
| Portugal Int. | 03/05 09:20 | - | Justin Seibel v Matthew Waring | L | 0-2 | |
| Dutch Open | 10/24 11:15 | - |
Dicky Dwi Pangestu
v
Justin Seibel |
L | 2-0 | |
| Dutch Open Qual | 10/23 14:40 | - |
Joel Koenig
v
Justin Seibel |
W | 0-2 | |
| Dutch Open Qual | 10/23 08:10 | - |
Tg Russelsheim 2
v
Justin Seibel |
W | 0-2 | |
| Czech Open Qual | 10/17 07:20 | - | Justin Seibel v Ziga Podgorsek | L | 1-2 | |
| Lithuanian Int. Quals | 06/06 11:15 | - | Rafael Gavois v Justin Seibel | L | 2-0 | |
| Bonn Int. Qual | 05/30 07:00 | - | Justin Seibel v Nino Portales | L | 1-2 | |
| Bonn Int. Qual | 05/29 14:20 | - | Jacob Thyge v Justin Seibel | W | 0-2 | |
| Bonn Int. Qual | 05/29 08:00 | - | Michael Pang v Justin Seibel | W | 1-2 | |
| Luxembourg Open Qual | 05/02 09:25 | - | Justin Seibel v Nicholas Raj | L | 0-2 | |
| Finnish Int. Qual | 04/25 11:15 | - | Justin Seibel v Juuso Kuoppala | L | 1-2 | |
| Finnish Int. Qual | 04/25 08:35 | - | Mats Duwel v Justin Seibel | - | Walkover | |
| Malta Int. Qual | 04/04 11:15 | - | Charlie Castle v Justin Seibel | L | 2-1 |
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