| 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 | Nicholas Heng v Alexander Stater | 0-6,6-3,6-3 |
| UTR Pro Tennis Series California | 2021/05/27 16:30 | Connor Farren v Nicholas Heng | 6-2,5-4 |
| UTR Pro Tennis Series California | 2021/05/26 18:00 | Nicholas Heng v JC Aragone | 4-6,5-6 |
| UTR Pro Tennis Series California | 2021/05/25 16:30 | Nicholas Heng v Lawee Sherif | 4-6,6-2,5-1 |
| UTR Pro Tennis Series California | 2021/05/24 19:30 | Drew Baird v Nicholas Heng | 6-3,6-4 |
| UTR Pro Tennis Series Atlanta | 2021/04/18 14:30 | Jacob Brumm v Nicholas Heng | 6-1,5-7,0-0 |
| UTR Pro Tennis Series Atlanta | 2021/04/17 17:00 | Alex Cairo v Nicholas Heng | 6-4,3-6,1-6 |
| 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 California | 2021/05/30 15:00 | Kyle Kang v Nicolas Barrientos | 2-6,6-2,3-6 |