Stadium: Court 5 Round: 27 Ground: Hardcourt outdoor
| Tulsa, Singles Main, M-ITF-USA-16A | 2021/06/17 16:20 | Hiroki Moriya v Barrientos, Nicolas | 1-6,3-6 |
| Tulsa, Singles Main, M-ITF-USA-16A | 2021/06/16 23:30 | Bryde, Trent v Barrientos, Nicolas | 3-6,3-6 |
| Tulsa, Singles Main, M-ITF-USA-16A | 2021/06/15 14:00 | Brymer, Gage v Barrientos, Nicolas | 5-7,5-7 |
| Tulsa, Singles Main, M-ITF-USA-16A | 2021/06/14 15:00 | Juan Carlos Aguilar v Barrientos, Nicolas | 3-6,3-6 |
| UTR Pro Tennis Series California | 2021/05/30 15:00 | Kyle Kang v Barrientos, Nicolas | 2-6,6-2,3-6 |
| UTR Pro Tennis Series California | 2021/05/29 15:00 | Ortlip, Joshua v Barrientos, Nicolas | 1-6,7-6,2-5 |
| UTR Pro Tennis Series California | 2021/05/28 16:30 | Hadigian, Eric v Barrientos, Nicolas | 3-6,2-6 |
| UTR Pro Tennis Series California | 2021/05/26 18:00 | Barrientos, Nicolas v Bailey, Aaron | 6-4,5-2 |
| Tulsa, Singles Main, M-ITF-USA-16A | 2021/06/17 16:15 | Tristan Schoolkate v Ezekiel Clark | 4-6,3-6 |
| Tulsa, Singles Main, M-ITF-USA-16A | 2021/06/17 01:55 | Ezekiel Clark v Nicolas Alvarez | 6-4,6-2 |
| Tulsa, Singles Main, M-ITF-USA-16A | 2021/06/15 15:50 | Noah Schachter v Ezekiel Clark | 1-6,2-6 |
| Tulsa, Singles Main, M-ITF-USA-16A | 2021/06/14 22:00 | Benjamin Kittay v Ezekiel Clark | 6-4,1-6,4-10 |
| ITF M25 Wichita | 2021/06/10 19:40 | Felix Corwin v Ezekiel Clark | 3-6,6-3,6-3 |
| ITF M25 Wichita | 2021/06/09 23:00 | Ezekiel Clark v Beren, Samuel | 6-4,6-2 |
| ITF - M15 Santo Domingo | 2020/12/11 13:30 | Nick Chappell v Ezekiel Clark | 6-3,2-6,6-1 |
| ITF - M15 Santo Domingo | 2020/12/10 13:30 | Ezekiel Clark v Olivares, Jose | 6-3,6-2 |