| Challenger Stockton Qual | 10/01 19:30 | 46 | Collin Altamirano v Ruan Roelofse | 7-5,4-6,0-6 | |
| Challenger Stockton Qual | 09/30 20:00 | 45 | Tadiwa Chinamo v Collin Altamirano | 6-4,2-6,0-6 | |
| ITF USA F32 | 09/26 20:20 | 25 | Brandon Holt v Collin Altamirano | 6-2,6-1 | |
| ITF USA F31 | 09/23 18:15 | 28 | Henry Craig v Collin Altamirano | 6-4,6-4 | |
| ITF USA F31 | 09/22 19:20 | 27 | Collin Altamirano v Tom Fawcett | 6-1,6-2 | |
| ITF USA F31 | 09/21 22:05 | 26 | Gianni Ross v Collin Altamirano | 6-7,3-6 | |
| ITF USA F31 | 09/20 17:00 | 25 | Collin Altamirano v Raleigh Smith | 6-1,6-2 | |
| ITF USA F30 | 09/12 17:00 | 25 | Collin Altamirano v Ronnie Schneider | 6-4,1-6,2-6 | |
| ITF USA F9 | 02/28 17:40 | 25 | Collin Altamirano v Sekou Bangoura | 5-7,1-6 | |
| ITF USA F2 | 01/15 20:30 | 29 | Collin Altamirano v Marcos Giron | 6-7,1-6 | |
| ITF USA F2 | 01/14 18:00 | 28 | Carl Soderlund v Collin Altamirano | 3-6,6-4,4-6 | |
| ITF USA F2 | 01/14 01:15 | 27 | Mackenzie McDonald v Collin Altamirano | 3-6,1-6 | |
| ITF USA F2 | 01/13 21:05 | 26 | Logan Smith v Collin Altamirano | 6-7,3-6 | |
| ITF USA F2 | 01/11 18:00 | 25 | Collin Altamirano v Dennis Nevolo | 7-6,6-4 | |
| ITF USA F1 | 01/06 19:30 | 27 | Collin Altamirano v Carl Soderlund | 6-7,3-6 | |
| ITF USA F1 | 01/05 18:00 | 26 | Collin Altamirano v Karue Sell | 7-6,7-5 | |
| ITF USA F1 | 01/04 18:00 | 25 | Tommy Paul v Collin Altamirano | 6-4,0-6,3-6 | |
| ITF USA F1 Qual | 01/02 20:20 | 62 | Collin Altamirano v Mousheg Hovhannisyan | 6-2,6-2 | |
| ITF USA F1 Qual | 01/02 00:00 | 62 | Collin Altamirano v Alec Adamson | 6-0,6-0 | |
| Challenger Fairfield Qual | 10/08 20:25 | 45 | Ruan Roelofse v Collin Altamirano | 6-3,4-6,7-6 | |
| ITF Spain F22 | 07/20 09:00 | 26 | Marc Giner v Collin Altamirano | 7-6,6-1 | |
| ITF Spain F22 | 07/19 07:30 | 25 | Patrick Mayer v Collin Altamirano | 4-6,5-7 | |
| ITF Belgium F4 | 07/08 10:20 | 27 | Collin Altamirano v Yannick Vandenbulcke | Retired | |
| ITF Belgium F4 | 07/06 15:15 | 26 | Jolan Cailleau v Collin Altamirano | 4-6,2-6 | |
| ITF Belgium F4 | 07/05 07:00 | 25 | Bart Stevens v Collin Altamirano | 6-2,3-6,2-6 | |
| ITF Belgium F3 | 06/28 12:50 | 25 | Christoph Negritu v Collin Altamirano | 4-6,6-2,6-2 | |
| ITF Belgium F2 | 06/22 08:00 | 25 | Juan Carlos Saez v Collin Altamirano | 6-2,6-4 | |
| ITF Belgium F1 | 06/14 08:00 | 25 | Collin Altamirano v Enzo Couacaud | 5-7,0-6 | |
| ITF USA F1 Qual | 01/03 18:00 | 62 | Collin Altamirano v Nicholas S. Hu | 7-6,2-6,6-7 | |
| ITF USA F1 Qual | 01/02 17:00 | 62 | Collin Altamirano v Nicholas Shamma | 6-1,6-1 |