| Challenger Guayaquil | 2021/10/31 16:00 | Hernandez Serrano, Juan Alejandro v Gonzalez, Alejandro | 0-6,2-6 |
| ITF M25 Guayaquil | 2021/10/29 15:00 | Hernandez Serrano, Juan Alejandro v Facundo Juarez | 3-6,4-6 |
| ITF M25 Guayaquil | 2021/10/28 18:35 | Hernandez Serrano, Juan Alejandro v Achondo, Gonzalo | 6-0,6-1 |
| ITF M25 Guayaquil | 2021/10/26 15:00 | Hernandez Serrano, Juan Alejandro v Santamaria, Felipe | 6-1,6-3 |
| Bogota, Colombia | 2021/10/17 18:10 | Luca Castelnuovo v Hernandez Serrano, Juan Alejandro | 6-4,6-2 |
| ITF M15 Cancun | 2021/10/09 15:00 | Hernandez Serrano, Juan Alejandro v Christian Langmo | 6-3,3-6,6-7 |
| ITF M15 Cancun | 2021/10/07 16:25 | Hernandez Serrano, Juan Alejandro v Giles Hussey | 4-6,6-2,6-3 |
| ITF M15 Cancun | 2021/10/06 16:30 | Mwendwa Mbithi v Hernandez Serrano, Juan Alejandro | 3-6,2-6 |