| 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 |