| Challenger Little Rock | 2019/06/04 15:00 | Collin Altamirano v Alexander Sarkissian | 6-3,6-1 |
| Challenger Lima | 2020/11/24 15:00 | Jesper De Jong v Collin Altamirano | 6-2,6-4 |
| Challenger Lima | 2020/11/22 15:00 | Collin Altamirano v Thiago Agustin Tirante | 4-6,4-6 |
| UTR Pro Tennis Series California | 2020/07/03 16:00 | Collin Altamirano v Felix Corwin | 4-6,2-6 |
| UTR Pro Tennis Series California | 2020/07/02 19:25 | Keegan Smith v Collin Altamirano | 6-4,6-4 |
| UTR Pro Tennis Series California | 2020/07/01 16:00 | Collin Altamirano v Dusty H. Boyer | 7-6,6-7,10-1 |
| UTR Pro Tennis Series California | 2020/06/30 16:00 | Nick Chappell v Collin Altamirano | 4-6,1-6 |
| UTR Pro Tennis Series California | 2020/06/29 21:00 | Collin Altamirano v Bogdan Bobrov | 6-3,6-0 |
| UTR Pro Tennis Series California | 2020/06/28 19:20 | Collin Altamirano v Felix Corwin | 4-6,4-6 |
| UTR Pro Tennis Series California | 2021/02/21 16:00 | Alexander Sarkissian v Gage Brymer | 0-6,6-2,7-5 |
| UTR Pro Tennis Series California | 2021/02/19 21:30 | Alexander Sarkissian v Kalman Boyd | 6-2,2-6,6-4 |
| UTR Pro Tennis Series California | 2021/02/18 20:30 | Alexander Sarkissian v Jonas Maier | 6-3,6-4 |
| UTR Pro Tennis Series California | 2021/02/17 18:00 | Aaron Bailey v Alexander Sarkissian | 2-6,4-6 |
| UTR Pro Tennis Series California | 2021/02/16 22:00 | Joshua Ortlip v Alexander Sarkissian | 6-3,6-4 |
| UTR Pro Tennis Series California | 2021/02/13 16:00 | Gage Brymer v Alexander Sarkissian | 1-6,3-6 |
| UTR Pro Tennis Series California | 2021/02/12 21:30 | Alec Adamson v Alexander Sarkissian | 2-6,3-6 |
| UTR Pro Tennis Series California | 2021/02/11 18:00 | Joshua Ortlip v Alexander Sarkissian | 6-7,4-5 |