| UTR Pro Tennis Series California | 2021/05/30 15:00 | Kyle Kang v Nicolas Barrientos | 2-6,6-2,3-6 |
| UTR Pro Tennis Series California | 2021/05/29 15:00 | Joshua Ortlip v Nicolas Barrientos | 1-6,7-6,2-5 |
| UTR Pro Tennis Series California | 2021/05/28 16:30 | Eric Hadigian v Nicolas Barrientos | 3-6,2-6 |
| UTR Pro Tennis Series California | 2021/05/26 18:00 | Nicolas Barrientos v Aaron Bailey | 6-4,5-2 |
| UTR Pro Tennis Series California | 2021/05/25 18:30 | Nicolas Barrientos v Kalman Boyd | 6-7,6-4,6-4 |
| UTR Pro Tennis Series California | 2021/05/24 16:30 | Rohan Murali v Nicolas Barrientos | 0-6,1-6 |
| ITF M25 Pensacola | 2021/05/19 16:30 | Adrian Andreev v Nicolas Barrientos | 6-4,6-2 |
| ITF M25 Pensacola | 2021/05/18 14:30 | Nicolas Barrientos v Alexander Bernard | 4-6,6-1,10-4 |