| Challenger Rio De Janeiro | 2021/12/15 13:00 | Gabriel Decamps v Barrientos, Nicolas | 6-1,6-4 |
| Challenger Rio De Janeiro | 2021/12/13 14:30 | Barrientos, Nicolas v Pedro Boscardin Dias | 6-4,6-2 |
| Challenger Rio De Janeiro | 2021/12/12 16:00 | Barrientos, Nicolas v Giannella, Joao | 6-1,6-2 |
| Challenger - Florianopolis | 2021/12/10 15:30 | Barrientos, Nicolas v Genaro Alberto Olivieri | 2-6,4-6 |
| Challenger - Florianopolis | 2021/12/09 13:00 | Barrientos, Nicolas v Gonzalo Villanueva | 7-6,6-1 |
| Challenger - Florianopolis | 2021/12/07 16:50 | Juan Pablo Ficovich v Barrientos, Nicolas | 3-6,0-6 |
| Challenger - Florianopolis | 2021/12/06 14:20 | Gomez, Alejandro v Barrientos, Nicolas | 4-6,2-6 |
| Challenger - Florianopolis | 2021/12/05 15:25 | Victor Tosetto v Barrientos, Nicolas | 1-6,1-6 |