| 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 | 2021/02/12 20:00 | Kyle Kang v Nicolas Barrientos | 3-6,2-5 |
| 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 |
| ITF M25 Tulsa | 2021/06/15 14:00 | Gage Brymer v Nicolas Barrientos | 5-7,5-7 |
| ITF M25 Tulsa | 2021/06/14 15:00 | Juan Carlos Aguilar v Nicolas Barrientos | 3-6,3-6 |
| UTR Pro Tennis Series Nevada | 2021/06/22 18:00 | Nicholas Heng v Kyle Kang | 5-7,3-6 |
| UTR Pro Tennis Series Nevada | 2021/06/21 15:00 | Kyle Kang v Alfredo Perez | 3-6,6-7 |
| 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 16:30 | Colton Smith v Kyle Kang | 5-7,3-6 |
| UTR Pro Tennis Series California | 2021/05/28 16:30 | Humberto Lopez v Kyle Kang | 4-6,4-6 |
| UTR Pro Tennis Series California | 2021/05/26 16:30 | Ivan Thamma v Kyle Kang | 6-7,4-5 |
| UTR Pro Tennis Series California | 2021/05/25 21:30 | Daniel Traxler v Kyle Kang | 1-6,2-6 |
| UTR Pro Tennis Series California | 2021/05/24 18:00 | Kyle Kang v Ishaan Ravichander | 6-1,6-1 |