Stadium: Court 1 Round: 54 Ground: Clay
| 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 |
| UTR Pro Tennis Series Barcelona | 2021/08/06 08:30 | Jordi Munoz-Abreu v Alejandro Mendoza | 4-6,3-6 |
| UTR Pro Tennis Series Barcelona | 2021/08/05 07:00 | Francois Musitelli v Alejandro Mendoza | 6-3,5-2 |
| ITF M25 Oviedo | 2021/08/29 11:30 | Jaime P Targhetta v Mario Mansilla Diez | 0-6,2-6 |
| ITF M25 Santander | 2021/08/23 09:00 | Miguel Damas v Mario Mansilla Diez | 6-2,6-3 |
| ITF M25 Santander | 2021/08/22 09:00 | Jesus Echevarri v Mario Mansilla Diez | 2-6,1-6 |
| ITF M15 Xativa | 2021/08/02 07:00 | Vicente O Moratalla v Mario Mansilla Diez | 6-7,7-6,11-9 |
| ITF M15 Xativa | 2021/08/01 07:00 | Thijmen Loof v Mario Mansilla Diez | 2-6,2-6 |
| ITF M25 Denia | 2021/07/26 09:30 | Mario Mansilla Diez v Emilien Voisin | 6-4,2-6,6-10 |
| ITF M25 Gandia | 2021/07/21 07:30 | Mario Mansilla Diez v Alejandro Gomez | 7-5,1-6,6-7 |
| ITF M25 Gandia | 2021/07/20 10:15 | Mario Mansilla Diez v Rayane Oumaouche | 6-0,7-5 |