Stadium: Court 2 Round: 44 Ground: Hardcourt outdoor
| ITF M25 Idanha-A-Nova | 2021/07/11 10:30 | Miguel Damas v Mario G Fernandez | 4-6,7-6,10-7 |
| ITF M15 Marbella | 2021/05/23 14:00 | Xavi Matas Ortega v Mario G Fernandez | 6-3,6-4 |
| ITF M15 Valldoreix | 2021/05/12 11:00 | Juan Bautista Otegui v Mario G Fernandez | 6-4,6-3 |
| ITF M15 Majadahonda | 2021/05/02 13:15 | Mario G Fernandez v Carlos Lopez Montagud | 1-6,2-6 |
| ITF M25 Reus | 2021/04/11 11:00 | Titouan Droguet v Mario G Fernandez | 6-2,6-4 |
| ITF M15 Antalya | 2021/03/02 07:00 | Stefan Palosi v Mario G Fernandez | 4-6,6-0,10-5 |
| ITF M15 Antalya | 2021/03/01 10:00 | Mario G Fernandez v Marlon Vankan | 1-6,6-2,13-11 |
| ITF M15 Antalya | 2021/02/28 08:00 | Mario G Fernandez v Adrian Mateo Bejenaru | 5-7,6-4,11-9 |
| ITF M25 Idanha-A-Nova | 2021/07/12 08:00 | Daniel Rodrigues v Guilherme Sousa Severin | 4-6,6-2,11-9 |
| ITF M15 Almada | 2021/07/04 09:30 | Goncalo Falcao v Guilherme Sousa Severin | 7-5,7-5 |
| ITF M15 Monastir | 2021/06/14 12:00 | Ajeet Rai v Guilherme Sousa Severin | 6-0,6-2 |
| ITF M15 Monastir | 2021/06/14 08:00 | Guilherme Sousa Severin v Kazuma Kawachi | 6-4,4-6,10-4 |
| ITF M15 Monastir | 2021/06/13 11:30 | Seth Seely v Guilherme Sousa Severin | 1-6,1-6 |
| ITF M15 Monastir | 2021/06/08 11:00 | Guilherme Sousa Severin v Thomas Fancutt | 6-2,4-6,4-6 |
| ITF M15 Quinta Do Lago | 2020/11/02 10:00 | Guilherme Sousa Severin v Terence Das | 1-6,0-6 |
| ITF M25 Vale Do Lobo | 2020/10/25 14:00 | Joao Lucas Reis da Silva v Guilherme Sousa Severin | 6-4,5-7,10-8 |