| UTR Pro Tennis Series - California | 2021/02/22 18:00 | Collin Altamirano v Alexander Sarkissian | 5-7,3-6 |
| 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 | 2021/02/22 15:54 | Colton Smith v Shahin Khaledan | 6-1,7-6 |
| UTR Pro Tennis Series - California | 2021/02/20 20:30 | Colton Smith v Aidan Mayo | 6-1,6-7,3-6 |
| UTR Pro Tennis Series - California | 2021/02/18 20:30 | Colton Smith v Spencer Johnson | 6-4,6-6 |
| UTR Pro Tennis Series - California | 2021/02/17 20:00 | Colton Smith v Luis Humberto Lopez | 7-5,3-6,6-2 |
| UTR Pro Tennis Series - California | 2021/02/16 18:00 | Colton Smith v Nicolas Barrientos | 3-6,4-5 |
| UTR Pro Tennis Series - California | 2021/02/15 19:00 | Colton Smith v Mousheg Hovhannisyan | 5-7,6-6 |