Stadium: Court 1 Round: 25 Ground: Clay
| UTR Pro Tennis Series Manzanillo | 2021/08/14 13:00 | Patino, Luis v Hernandez Serrano, Juan Alejandro | 4-6,6-2,6-2 |
| UTR Pro Tennis Series Manzanillo | 2021/08/13 14:30 | Hernandez Serrano, Juan Alejandro v Lazaro Navarro-Batles | 6-3,6-0 |
| UTR Pro Tennis Series Manzanillo | 2021/08/12 16:00 | Hernandez Serrano, Juan Alejandro v Alan Magadan | 7-6,6-7,6-0 |
| UTR Pro Tennis Series Manzanillo | 2021/08/11 16:00 | Takeyasu Sekiguchi v Hernandez Serrano, Juan Alejandro | 4-6,6-3,3-6 |
| UTR Pro Tennis Series Manzanillo | 2021/08/10 13:00 | Sepulveda, Marcelo v Hernandez Serrano, Juan Alejandro | 1-6,3-6 |
| ITF M25 Guayaquil | 2021/08/05 14:30 | Jose Pereira v Hernandez Serrano, Juan Alejandro | 6-3,6-3 |
| ITF M25 Guayaquil | 2021/08/03 14:30 | Hernandez Serrano, Juan Alejandro v Nicolas Alvarez | 6-3,3-6,6-3 |
| ITF M25 Portoviejo | 2021/07/29 14:25 | March, Antonio Cayetano v Hernandez Serrano, Juan Alejandro | 6-3,7-6 |
| ITF M15 Ibague | 2021/09/07 14:00 | Mateo Barreiros Reyes v Ribero Duarte, William Yovanny | 6-0,6-4 |
| ITF M15 Ibague | 2021/09/06 20:25 | Mateo Barreiros Reyes v Montoya, Daniel | 6-1,6-2 |
| UTR Pro Tennis Series Florida | 2021/08/29 14:15 | Boyer, Toby D v Mateo Barreiros Reyes | 6-2,2-2 |
| UTR Pro Tennis Series Florida | 2021/08/28 13:30 | Omar Maldonado v Mateo Barreiros Reyes | 3-6,4-5 |
| UTR Pro Tennis Series Florida | 2021/08/27 15:00 | Parth Aggarwal v Mateo Barreiros Reyes | 6-7,2-6 |
| UTR Pro Tennis Series Florida | 2021/08/26 15:00 | Panta Herreros, Jorge Brian v Mateo Barreiros Reyes | 6-3,6-0 |
| UTR Pro Tennis Series Florida | 2021/08/24 15:00 | Kian Vakili v Mateo Barreiros Reyes | 6-7,7-5,3-6 |
| UTR Pro Tennis Series Florida | 2021/08/22 12:00 | Chase Ferguson v Mateo Barreiros Reyes | 6-0,3-6,5-3 |