Stadion: BNP Paribas Court Round: 27 Ground: Clay
| ITF - M25 - Eupen | 2021/09/09 09:25 | Gauthier Onclin v Colin Sinclair | 6-2,2-6,4-6 |
| ITF - M25 - Eupen | 2021/09/08 09:30 | Colin Sinclair v Yan Sabanin | 6-3,7-6 |
| ITF - M25 - Eupen | 2021/09/07 09:45 | Colin Sinclair v Francesco Ferrari | 6-1,6-1 |
| ITF - M25 - Eupen | 2021/09/06 07:30 | Colin Sinclair v Alexander Wolfschmidt | 6-0,6-2 |
| ITF - M25 - Ricany | 2021/08/31 09:35 | Mateus Alves v Colin Sinclair | 6-7,6-3,6-4 |
| ITF - M15 - Huy | 2021/08/24 13:00 | Raphael Collignon v Colin Sinclair | 4-6,7-6,6-2 |
| UTR Pro Tennis Series - Portoroz | 2021/08/21 09:30 | Oleksandr Bielinskyi v Colin Sinclair | 3-6,3-4 |
| UTR Pro Tennis Series - Portoroz | 2021/08/20 11:00 | Colin Sinclair v Tilen Zitnik | 6-3,6-1 |
| ITF - M25 - Eupen | 2021/09/09 07:30 | Tristan Schoolkate v Facundo Diaz Acosta | 1-6,7-6,2-6 |
| ITF - M25 - Eupen | 2021/09/07 11:00 | Benjamin Dhoe v Facundo Diaz Acosta | 0-6,2-6 |
| ITF - M25 - Ricany | 2021/09/03 08:30 | Robin Stanek v Facundo Diaz Acosta | 6-1,6-3 |
| ITF - M25 - Ricany | 2021/09/02 09:45 | Antonin Bolardt v Facundo Diaz Acosta | 2-6,3-6 |
| ITF - M25 - Ricany | 2021/09/01 11:40 | Filip Bergevi v Facundo Diaz Acosta | 3-6,4-6 |
| Challenger - Prag | 2021/08/26 08:30 | Facundo Diaz Acosta v Ryan Peniston | 3-6,1-6 |
| Challenger - Prag | 2021/08/25 08:00 | Matija Pecotic v Facundo Diaz Acosta | 3-6,6-7 |
| Challenger - Prag | 2021/08/24 10:25 | Facundo Diaz Acosta v Matteo Donati | 6-1,6-3 |