Stadium: Court 1 Round: 54 Ground: Clay
| ITF - M15 La Nucia | 2021/03/09 11:00 | Mario Mansilla Diez v Miguel Damas | 6-3,3-6,3-10 |
| ITF - M25 Santander | 2021/08/22 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 Idanha-A-Nova | 2021/07/12 13:25 | Miguel Damas v Ben Jones | 7-5,6-3 |
| ITF - M25 Idanha-A-Nova | 2021/07/11 10:30 | Miguel Damas v Mario G Fernandez | 4-6,7-6,10-7 |
| ITF - M15 Almada | 2021/07/05 10:00 | Miguel Damas v Daniel Batista | 4-6,4-6 |
| 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 |
| ITF - M25 Gandia | 2021/07/19 10:00 | Emilien Voisin v Mario Mansilla Diez | 5-7,1-6 |
| ITF - M25 Bakio | 2021/06/27 16:00 | Gabriel Diaz Freire v Mario Mansilla Diez | 6-4,3-6,10-6 |