Stadium: Cancha 3 Round: 26
| ITF M25 Guayaquil | 2021/10/26 15:00 | Juan A H Serrano v Felipe Santamaria | 6-1,6-3 |
| Challenger Bogota | 2021/10/17 18:10 | Luca Castelnuovo v Juan A H Serrano | 6-4,6-2 |
| ITF M15 Cancun | 2021/10/09 15:00 | Juan A H Serrano v Christian Langmo | 6-3,3-6,6-7 |
| ITF M15 Cancun | 2021/10/07 16:25 | Juan A H Serrano v Giles Hussey | 4-6,6-2,6-3 |
| ITF M15 Cancun | 2021/10/06 16:30 | Mwendwa Mbithi v Juan A H Serrano | 3-6,2-6 |
| ITF M15 Cancun | 2021/09/24 15:00 | Federico Agustin Gomez v Juan A H Serrano | 3-6,6-4,7-6 |
| ITF M15 Cancun | 2021/09/23 14:00 | Jesse Flores v Juan A H Serrano | 4-6,4-6 |
| ITF M15 Cancun | 2021/09/22 20:45 | Joshua Sheehy v Juan A H Serrano | 3-6,2-6 |
| ITF M25 Guayaquil | 2021/10/26 16:20 | Juan Diego Rojas Mora v Gonzalo Achondo | 6-4,1-6,4-6 |
| ITF M15 Cairo | 2021/08/30 12:30 | Gonzalo Achondo v Lorenzo Gagliardo | 4-6,0-6 |
| ITF M15 Bad Waltersdorf | 2021/08/23 07:00 | Gonzalo Achondo v Philip Bachmaier | 0-6,3-6 |
| ITF M15 Warmbad-Villach | 2021/08/16 12:30 | Philip Bachmaier v Gonzalo Achondo | 6-1,6-3 |
| ITF M15 Warmbad-Villach | 2021/08/16 07:00 | Ivan Kazakov v Gonzalo Achondo | 6-3,0-6,8-10 |
| ITF M15 Xativa | 2021/08/02 07:00 | Francisco Andreu Garcia v Gonzalo Achondo | 6-3,6-1 |
| ITF USA F40 Qual | 2017/12/03 18:00 | Gonzalo Achondo v Mason Beiler | 3-6,0-6 |
| ITF USA F40 Qual | 2017/12/02 16:00 | Jack Vance v Gonzalo Achondo | 3-6,6-4,4-6 |