Stadium: Cancha 7 Round: 26 Ground: Hardcourt outdoor
| UTR Pro Tennis Series Barcelona | 2021/08/06 10:00 | Osgar O'Hoisin v Nicolas Bianchi | 4-6,6-0,6-4 |
| UTR Pro Tennis Series Barcelona | 2021/08/04 08:30 | Osgar O'Hoisin v Kuzey Cekirge | 3-6,6-7 |
| UTR Pro Tennis Series Barcelona | 2021/08/03 07:00 | Osgar O'Hoisin v Xavier Gabarro | 6-3,6-2 |
| UTR Pro Tennis Series Barcelona | 2021/08/02 11:30 | Pol Fernandez v Osgar O'Hoisin | 6-7,7-6,1-6 |
| ITF M15 Castelo Branco | 2021/07/26 11:00 | Sahar Simon v Osgar O'Hoisin | 4-6,6-4,10-6 |
| ITF M15 Castelo Branco | 2021/07/25 08:00 | Osgar O'Hoisin v Ivan Zaytsev | 7-5,6-0 |
| ITF M25 Idanha-A-Nova | 2021/07/18 10:30 | Raphael Lambling v Osgar O'Hoisin | 1-6,6-3,10-7 |
| ITF M25 Idanha-A-Nova | 2021/07/13 08:00 | Yasha Zemel v Osgar O'Hoisin | 6-4,4-6,12-10 |
| ITF M15 Sofia | 2021/07/06 09:50 | Colin Sinclair v Dragos Nicolae Madaras | 3-6,2-6 |
| ITF M25 Belgrade | 2021/06/30 07:00 | Colin Sinclair v Edoardo Eremin | 2-6,1-6 |
| UTR Pro Tennis Series Bucharest | 2021/05/23 07:00 | Nicolae Frunza v Colin Sinclair | 5-6 |
| UTR Pro Tennis Series Bucharest | 2021/05/22 12:30 | Ilya Snitari v Colin Sinclair | 6-4,6-7,6-7 |
| UTR Pro Tennis Series Bucharest | 2021/05/22 07:00 | Colin Sinclair v Simon Beaupain | 6-3,6-4 |
| UTR Pro Tennis Series Bucharest | 2021/05/19 10:00 | Colin Sinclair v Juan Ignacio Galarza | 4-6,2-6 |
| UTR Pro Tennis Series Bucharest | 2021/05/18 10:00 | Colin Sinclair v Tomas Lipovsek Puches | 6-2,5-1 |
| UTR Pro Tennis Series Bucharest | 2021/05/17 12:30 | Nicholas David Ionel v Colin Sinclair | 6-7,4-5 |