| Norwegian Int. Qual | 2019/11/07 12:00 | Shaun Ekengren v Sibbald, Thomas | L | 2-1 |
| Belgian Int. Qual | 2019/09/11 15:15 | Sibbald, Thomas v Wolfgang Gnedt | L | 0-2 |
| Lithuanian Int. Qual | 2019/06/06 14:30 | Dauskurtas, Kazimieras v Sibbald, Thomas | W | 0-2 |
| Latvia Int. Qual | 2019/05/30 11:30 | Sibbald, Thomas v Tony Lindelof | L | 0-2 |
| Latvia Int. Qual | 2019/05/30 07:30 | Sibbald, Thomas v Jack Taylor | W | 2-1 |
| Dutch Int. - Qualif. | 2019/04/11 07:30 | Edison, Keith Mark v Sibbald, Thomas | L | 2-1 |
| Open de Suisse - Doubles Femmes - Qualif. | 2018/12/13 12:00 | Alcala, Alejandro v Sibbald, Thomas | L | 2-0 |
| Open de Suisse - Doubles Femmes - Qualif. | 2018/11/14 12:00 | Abildgaard, Patrick v Sibbald, Thomas | L | 2-0 |
| Cyprus Int. Qual | 2021/10/14 15:05 | Kattirtzi, Aris v Mikolaj Szymanowski | L | 0-2 |
| Cyprus Int. Qual | 2021/10/14 13:30 | Andrei Don v Kattirtzi, Aris | W | 0-2 |