Stadium: Campo Directv Round: 14 Ground: Clay
| ITF M25 Medellin | 2021/09/14 19:40 | Johan A Rodriguez Rodriguez v Joao Lucas Reis da Silva | 3-6,1-6 |
| ITF M15 Ibague | 2021/09/08 17:00 | Johan A Rodriguez Rodriguez v Gustavo Heide | 6-4,6-7,4-6 |
| Challenger Santiago Qual | 2021/10/10 15:45 | Lucas Catarina v Barrientos, Nicolas | 6-4,7-5 |
| Challenger - Lima | 2021/09/28 17:15 | Oriol Roca Batalla v Barrientos, Nicolas | 7-5,7-6 |
| Challenger - Lima | 2021/09/27 15:00 | Barrientos, Nicolas v Federico Zeballos | 7-5,6-1 |
| Challenger - Lima | 2021/09/26 19:50 | Alexis Gautier v Barrientos, Nicolas | 0-6,0-6 |
| Challenger Cary | 2021/09/12 17:50 | Alexis Galarneau v Barrientos, Nicolas | 6-4,6-1 |
| Challenger St. Tropez | 2021/08/30 10:15 | Alexis Galarneau v Barrientos, Nicolas | 2-6,6-1,6-4 |
| Challenger St. Tropez | 2021/08/29 13:00 | Bouchelaghem, Cesar v Barrientos, Nicolas | 4-6,0-6 |
| UTR Pro Tennis Series Nevada | 2021/07/04 15:00 | Barrientos, Nicolas v Song, Evan | 1-5 |