Stadium: Court 5 Round: 25 Ground: Hardcourt indoor
| UTR Pro Tennis Series Dallas | 2021/08/08 15:30 | Evan Zhu v Nico Mostardi | 6-4,5-0 |
| UTR Pro Tennis Series Dallas | 2021/08/07 13:00 | Wyatt DeMulling v Nico Mostardi | 5-7,5-6 |
| UTR Pro Tennis Series Dallas | 2021/08/05 14:30 | Nico Mostardi v Nicolas Acevedo | 2-6,2-6 |
| UTR Pro Tennis Series Dallas | 2021/08/04 14:30 | Nico Mostardi v Top Nidunjianzan | 7-6,3-6,6-1 |
| UTR Pro Tennis Series Dallas | 2021/08/03 14:30 | Nico Mostardi v Stefan Latinov | 6-2,3-6,1-6 |
| UTR Pro Tennis Series Dallas | 2021/08/02 15:00 | Nico Mostardi v Kyle Frankel | 4-6,4-5 |
| UTR Pro Tennis Series Atlanta | 2021/07/07 15:30 | Nico Mostardi v Conner Huertas Del Pino | 6-4,3-6,0-5 |
| UTR Pro Tennis Series Atlanta | 2021/07/06 12:00 | Nico Mostardi v Nicholas McKinney | 1-6,6-3,3-6 |
| 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 |
| UTR Pro Tennis Series Portoroz | 2021/08/19 15:30 | Colin Sinclair v Aleksa Pisaric | 6-3,5-2 |
| UTR Pro Tennis Series Portoroz | 2021/08/18 12:30 | Yanais Laurent v Colin Sinclair | 5-7,5-7 |
| UTR Pro Tennis Series Portoroz | 2021/08/17 11:00 | Jan Vehovec v Colin Sinclair | 2-6,1-5 |
| ITF M15 Sofia | 2021/07/06 09:50 | Colin Sinclair v Dragos Nicolae Madaras | 3-6,2-6 |