| UTR Pro Tennis Series Nevada | 2021/06/25 15:00 | Nicolas Barrientos v Alfredo Perez | 6-7,6-4,3-5 |
| UTR Pro Tennis Series Nevada | 2021/06/24 15:00 | Nicolas Barrientos v Kyle Kang | 6-1,5-4 |
| UTR Pro Tennis Series Nevada | 2021/06/23 16:30 | Nicholas Heng v Nicolas Barrientos | 3-6,2-6 |
| UTR Pro Tennis Series Nevada | 2021/06/22 18:00 | Alexander Stater v Nicolas Barrientos | 6-7,6-1,3-6 |
| ITF M25 Tulsa | 2021/06/19 13:55 | Nicolas Barrientos v Nicolas Kicker | 6-1,2-6,1-6 |
| ITF M25 Tulsa | 2021/06/18 16:00 | Nicolas Barrientos v Ezekiel Clark | 4-6,6-0,7-6 |
| ITF M25 Tulsa | 2021/06/17 16:20 | Hiroki Moriya v Nicolas Barrientos | 1-6,3-6 |
| ITF M25 Tulsa | 2021/06/16 23:30 | Trent Bryde v Nicolas Barrientos | 3-6,3-6 |