Stadium: Court 5 Round: 25 Ground: Hardcourt outdoor
| ITF M15 Melilla | 2021/09/25 13:50 | Miguel Damas v Mario G Fernandez | 6-2,6-0 |
| ITF M15 Melilla | 2021/09/25 07:00 | Mario G Fernandez v Ignacio Monzon | 6-3,3-6,6-4 |
| ITF M15 Melilla | 2021/09/21 16:15 | Mario G Fernandez v Luis Diego Chavez Villalpando | 6-1,7-5 |
| ITF M25 Madrid | 2021/09/16 09:45 | Filip Misolic v Mario G Fernandez | 6-0,6-3 |
| ITF M25 Madrid | 2021/09/15 11:25 | Mario G Fernandez v Jeroen Vanneste | 6-2,7-6 |
| ITF M25 Madrid | 2021/09/14 07:00 | Manish Sureshkumar v Mario G Fernandez | 6-4,6-3 |
| ITF M15 Bad Waltersdorf | 2021/08/22 07:00 | Lorenzo Vatteroni v Mario G Fernandez | 7-5,6-4 |
| ITF M15 Warmbad-Villach | 2021/08/18 14:35 | Mario G Fernandez v Lukas Krainer | 6-7,6-2,1-6 |
| ITF M25 Pretoria | 2021/10/01 10:30 | Ryan Nijboer v Michail Pervolarakis | 3-6,1-6 |
| ITF M25 Pretoria | 2021/09/30 07:30 | Ryan Nijboer v Devin Badenhorst | 6-3,5-7,6-3 |
| ITF M25 Pretoria | 2021/09/29 12:20 | Ryan Nijboer v Menelaos Efstathiou | 6-3,6-0 |
| ITF M25 Johannesburg | 2021/09/21 10:25 | Rio Noguchi v Ryan Nijboer | 7-6,2-6,6-3 |
| ITF M25 Johannesburg | 2021/09/15 08:00 | Alafia Ayeni v Ryan Nijboer | 7-5,6-3 |
| ITF M25 Trier | 2021/08/27 15:00 | Ryan Nijboer v Henri Squire | 2-6,3-6 |
| ITF M25 Trier | 2021/08/26 09:30 | Constantin Schmitz v Ryan Nijboer | 4-6,2-6 |
| ITF M25 Trier | 2021/08/25 09:00 | Tom Gentzsch v Ryan Nijboer | 3-6,4-6 |