| Croatian International - Calificari | 09/29 11:40 | - | Matthias Kicklitz v Justin Seibel | L | 2-0 | |
| Croatian International - Calificari | 09/29 08:00 | - | Justin Seibel v Tino Daoudal | - | Retired | |
| Croatia Open | 06/20 17:40 | - | Ming Hong Lim v Justin Seibel | L | 2-0 | |
| Bonn Int. - Calificari | 06/15 08:30 | - | Justin Hoh v Justin Seibel | L | 2-0 | |
| Luxembourg Open - Calificari | 05/05 08:20 | - | Martin Ouazzen v Justin Seibel | L | 2-0 | |
| Italian Int. - Calificari | 12/16 12:04 | - | Sacha Leveque v Justin Seibel | L | 2-0 | |
| Slovenia Future Series - Calificari | 11/25 10:10 | 6 | Ludvig Petre Olsson v Justin Seibel | L | 2-0 | |
| Cyprus Int. Qual | 10/14 12:00 | - | Justin Seibel v Magnus Bach Kristensen | L | 0-2 | |
| Cyprus Int. Qual | 10/14 09:30 | - | Justin Seibel v Balazs Papai | W | 2-0 | |
| Hellas International - Calificari | 09/02 08:00 | - | Justin Seibel v Marios Michail Boulios | W | 2-0 |