Stadium: Court 8 Round: 25 Ground: Clay
| ITF M25 Oviedo | 2021/08/31 07:00 | Alejandro Mendoza v Nicolas Alvarez | 2-6,3-6 |
| ITF M25 Oviedo | 2021/08/30 08:00 | Alejandro Mendoza v Mario Mansilla Diez | 1-6,3-6 |
| ITF M25 Santander | 2021/08/23 09:00 | Alejandro Mendoza v Samuel M Arjona | 6-4,3-6,9-11 |
| ITF M25 Santander | 2021/08/22 09:00 | Alejandro Mendoza v Pablo Carretero | 6-1,6-4 |
| UTR Pro Tennis Series - Barcelona | 2021/08/15 06:30 | Xavier Gabarro v Alejandro Mendoza | 2-6,2-4 |
| UTR Pro Tennis Series - Barcelona | 2021/08/14 09:30 | Alejandro Mendoza v Kuzey Cekirge | 6-2,6-1 |
| UTR Pro Tennis Series - Barcelona | 2021/08/13 08:00 | Alejandro Mendoza v Nicolas Bianchi | 6-4,6-3 |
| UTR Pro Tennis Series - Barcelona | 2021/08/07 15:00 | Nicolas Bianchi v Alejandro Mendoza | 6-3,6-1 |
| ITF M15 Ibagué | 2021/09/07 14:00 | Gustavo Tedesco v Caio Gruber | 4-6,6-4,10-5 |
| ITF M15 Ibagué | 2021/09/06 18:30 | Wulfrano M M Esdras v Gustavo Tedesco | 4-6,2-6 |