| Irish Open Qual | 2019/11/13 16:30 | Yang Yang v O Brien, Jack Joseph | L | 2-0 |
| Irish Open Qual | 2019/11/13 10:00 | Patil, Arnav v O Brien, Jack Joseph | W | 0-2 |
| Lithuanian Int. Qual | 2019/06/06 08:20 | Brian Holtschke v O Brien, Jack Joseph | L | 2-0 |
| Latvia Int. Qual | 2019/05/30 14:00 | Markus Barth v O Brien, Jack Joseph | L | 2-0 |
| Latvia Int. Qual | 2021/08/26 09:40 | Pauls E Rozenvalds v Jonas Petkus | W | 0-2 |
| Lithuanian Int. Qual | 2019/06/07 06:30 | Jonas Petkus v Magnus Klinggaard | L | 0-2 |