Stadium: Court 3 Round: 25 Ground: Clay
| ITF M25 Santander | 2021/08/23 09:00 | Miguel Damas v Mario Mansilla Diez | 6-2,6-3 |
| ITF M15 La Nucia | 2021/03/09 11:00 | Mario Mansilla Diez v Miguel Damas | 6-3,3-6,3-10 |
| ITF M25 Santander | 2021/08/26 12:45 | Miguel Damas v Carlos Sanchez Jover | 6-3,1-6,2-6 |
| ITF M25 Santander | 2021/08/25 11:30 | Samuel M Arjona v Miguel Damas | 1-6,4-6 |
| 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 | Miguel Damas v Victor Bini | 6-1,3-6,10-7 |
| ITF M15 Xativa | 2021/08/05 16:30 | Carlos Lopez Montagud v Miguel Damas | 6-4,6-2 |
| ITF M15 Xativa | 2021/08/04 14:55 | Miguel Damas v Daniel Merida Aguilar | 4-6,6-3,7-5 |
| ITF M15 Castelo Branco | 2021/07/27 14:05 | Miguel Damas v Duarte Vale | 6-7,3-6 |
| ITF M25 Idanha-A-Nova | 2021/07/13 07:55 | Miguel Damas v Daniel Little | 3-6,7-6,7-10 |
| ITF M25 Oviedo | 2021/08/30 08:00 | Alejandro Mendoza v Mario Mansilla Diez | 1-6,3-6 |
| 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 |