Stadium: Court 6 Round: 62 Ground: Clay
| ITF M25 Madrid | 2021/10/24 09:30 | Samuel M Arjona v Daniel L Salmeron | 3-6,2-6 |
| 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 | Alejandro Mendoza v Samuel M Arjona | 6-4,3-6,9-11 |
| ITF M25 Santander | 2021/08/22 09:00 | Samuel M Arjona v Patrick Foley | 6-4,7-6 |
| ITF M15 Xativa | 2021/08/01 13:00 | Inaki Montes-De La Torre v Samuel M Arjona | 6-2,6-2 |
| ITF M25 Denia | 2021/07/25 08:00 | Vicente O Moratalla v Samuel M Arjona | 6-0,6-0 |
| ITF M25 Gandia | 2021/07/20 14:30 | Daniel Merida Aguilar v Samuel M Arjona | 6-3,6-1 |
| ITF M15 Sarajevo | 2021/05/30 12:00 | Samuel M Arjona v Nemanja Malesevic | 3-6,3-6 |
| ITF M15 Torello | 2021/11/05 10:00 | Lilian Marmousez v Mario Mansilla Diez | 6-4,6-4 |
| ITF M15 Torello | 2021/11/04 13:10 | Vilius Gaubas v Mario Mansilla Diez | 2-6,3-6 |
| ITF M15 Torello | 2021/11/02 15:35 | Mario Mansilla Diez v Alessandro Ingarao | 6-2,6-3 |
| ITF M15 Madrid | 2021/10/29 07:30 | Mario Mansilla Diez v Coleman Wong | 5-7,1-6 |
| ITF M15 Madrid | 2021/10/28 09:30 | Alejandro Moro Canas v Mario Mansilla Diez | 5-7,6-3,6-7 |
| ITF M15 Madrid | 2021/10/27 10:30 | Mario Mansilla Diez v Max Alcala Gurri | 6-3,6-7,6-1 |
| ITF M15 Girona | 2021/10/21 08:00 | Mario Mansilla Diez v Pol Toledo Bague | 3-6,2-6 |
| ITF M15 Girona | 2021/10/20 11:20 | Maxime Mora v Mario Mansilla Diez | 2-6,7-5,5-7 |