| ITF - M25 Pensacola | 2021/05/19 16:30 | Adrian Andreev v Barrientos, Nicolas | 6-4,6-2 |
| ITF - M25 Pensacola | 2021/05/18 14:30 | Barrientos, Nicolas v Alexander Bernard | 4-6,6-1,10-4 |
| ITF - M25 Pensacola | 2021/05/17 15:30 | Barrientos, Nicolas v Whiting, Tennyson | 6-2,6-3 |
| UTR Pro Tennis Series California | 2021/02/27 21:30 | Ryan James Storrie v Barrientos, Nicolas | 2-6,6-1,3-0 |
| UTR Pro Tennis Series California | 2021/02/26 20:00 | Joshua Sheehy v Barrientos, Nicolas | 5-7,4-5 |
| UTR Pro Tennis Series California | 2021/02/25 20:00 | Hovhannisyan, Mousheg v Barrientos, Nicolas | 5-7,3-6 |
| UTR Pro Tennis Series California | 2021/02/24 16:00 | Baker, Blu v Barrientos, Nicolas | 0-6,4-6 |
| UTR Pro Tennis Series California | 2021/02/22 20:00 | Spencer Johnson v Barrientos, Nicolas | 3-6,2-6 |