Stadium: Court 2 Round: 54 Ground: Hardcourt indoor
| ITF M15 Cancun | 2021/09/21 14:00 | Emil Reinberg v Osgar O'Hoisin | 6-3,6-3 |
| ITF M25 Champaign | 2021/09/14 17:00 | Perry Gregg v Osgar O'Hoisin | 6-2,6-3 |
| UTR Pro Tennis Series Barcelona | 2021/08/08 08:30 | Olexiy Kolisnyk v Osgar O'Hoisin | 7-6,3-6,5-2 |
| UTR Pro Tennis Series Barcelona | 2021/08/07 11:00 | Osgar O'Hoisin v Francois Musitelli | 2-0 |
| 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 |