Stadium: Court 3 Round: 54 Ground: Clay
| 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 |
| UTR Pro Tennis Series Barcelona | 2021/08/03 11:30 | Jaume Pla Malfeito v Alejandro Mendoza | 7-6,2-6,6-7 |
| 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 M25 Kiseljak | 2021/05/23 10:45 | Bozo Barun v Samuel M Arjona | 6-3,6-2 |
| ITF M15 Brcko | 2021/05/16 12:30 | Samuel M Arjona v Dusan Milanovic | 7-6,4-6,1-10 |
| ITF M15 Prijedor | 2021/05/09 07:00 | Samuel M Arjona v Federico Campana | 2-6,3-6 |