| 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 | |
| Portugal Int. Qual | 03/06 16:20 | - | Ngan, Heng Lin v Justin Seibel | L | 2-0 | |
| Bulgarian Int. Qual | 10/05 15:10 | - | Justin Seibel v Niilo Nyqvist | L | 0-2 | |
| Bulgarian Int. Qual | 10/05 13:00 | - | Justin Seibel v Helmer Andersson | W | 2-1 | |
| Bulgarian Int. Qual | 10/05 07:35 | - | Justin Seibel v Berat Ayindi | W | 2-0 | |
| Croatia Int. Qual | 09/29 14:35 | - | Justin Seibel v Loris Dietrich | - | View | |
| Croatian Int. | 09/29 09:55 | - | 번들가르드, 마틴 v Justin Seibel | L | 2-0 | |
| Croatia Int. Qual | 09/28 18:30 | - | 스토크피즈, 시몬 v Justin Seibel | W | 0-2 | |
| Croatian Int. | 09/28 14:35 | - | Justin Seibel v Loris Dietrich | - | View | |
| Croatia Int. Qual | 09/28 08:10 | - | Justin Seibel v Ashok Kumar, Arun Kumar | W | 2-1 | |
| Latvia Int. Qual | 08/31 08:20 | - | Bhabuta, Neil v Justin Seibel | L | 2-1 | |
| Latvia Int. Qual | 08/30 12:00 | - | Emil Dantler v Justin Seibel | W | 1-2 | |
| Lithuanian Int. Qual | 06/08 16:40 | - | Justin Seibel v Yohan Barbieri | L | 0-2 | |
| Lithuanian Int. Qual | 06/08 10:05 | - | 베르잔스키스, 다니엘리우스 v Justin Seibel | W | 1-2 | |
| Bonn Int. Qual | 05/31 09:55 | - | Justin Seibel v Yaro Van Delsen | L | 0-2 | |
| Dutch Int. Qual | 04/13 11:10 | - | Justin Seibel v Muhammad, Andi Fadel | L | 0-2 | |
| Iceland International 2020, MS, Qualification | 01/26 10:00 | - | Rimmer, Soen v Justin Seibel | L | 2-1 | |
| Slovenia Future Series Qual | 11/24 13:35 | - | Shun Saito v Justin Seibel | L | 2-0 | |
| Czech Open Qual | 10/20 16:20 | - | Justin Seibel v 셰이윌러, 줄리앙 | L | 0-2 | |
| Czech Open Qual | 10/20 11:05 | - | Justin Seibel v 샤우스버거, 마이클 | W | 2-0 | |
| Bulgarian Int. Qual | 10/06 13:25 | - | Charles Fouyn v Justin Seibel | L | 2-0 | |
| Bulgarian Int. Qual | 10/06 11:05 | - | Evgeni Uzunov v Justin Seibel | W | 0-2 | |
| Bulgarian Int. Qual | 10/06 07:00 | - | Marian Liptak v Justin Seibel | W | 0-2 | |
| Croatian Int. Qual | 09/29 11:40 | - | 킥리츠, 마티아스 v Justin Seibel | L | 2-0 | |
| Croatian Int. Qual | 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. Qual | 06/15 08:30 | - | Justin Hoh v Justin Seibel | L | 2-0 |