Stadium: Cancha 6 Round: 27 Ground: Hardcourt outdoor
| Challenger Todi | 2021/07/11 08:00 | Giovanni Fonio v Alejandro Mendoza | 6-1,6-1 |
| UTR Pro Tennis Series Copenhagen | 2021/06/16 08:00 | Alejandro Mendoza v Daniel De Jonge | 1-6,2-6 |
| UTR Pro Tennis Series Copenhagen | 2021/06/15 09:30 | Alejandro Mendoza v Oskar Brostrom Poulsen | 5-2 |
| UTR Pro Tennis Series California | 2021/02/27 17:30 | Alejandro Mendoza v Miles Jones | 4-6,1-6 |
| UTR Pro Tennis Series California | 2021/02/25 16:50 | Alejandro Mendoza v Ryan James Storrie | 1-6,1-6 |
| UTR Pro Tennis Series California | 2021/02/13 20:30 | Alejandro Mendoza v Karl Lee | 3-6,4-5 |
| UTR Pro Tennis Series California | 2021/02/11 22:00 | Alejandro Mendoza v Gage Brymer | 0-6,0-5 |
| ITF M15 Santo Domingo | 2020/12/07 14:00 | Alejandro Mendoza v Joaquin Caballer | 4-6,3-6 |
| 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 |