| ITF Cina F6 | 05/16 02:00 | 26 | Patrik Niklas-Salminen v Collin Altamirano | 7-6,7-5 | |
| ITF Cina F6 | 05/14 04:35 | 25 | Francis Casey Alcantara v Collin Altamirano | 1-6,0-6 | |
| ITF USA F10 | 04/13 16:20 | 27 | Harrison Adams v Collin Altamirano | 4-6,6-3,6-4 | |
| ITF USA F10 | 04/12 17:20 | 26 | Vasil Kirkov v Collin Altamirano | 1-6,7-5,2-6 | |
| ITF USA F10 | 04/11 15:00 | 25 | Collin Altamirano v Scott Griekspoor | 7-6,6-3 | |
| ITF USA F9 | 04/07 15:30 | 27 | Scott Griekspoor v Collin Altamirano | 7-6,6-2 | |
| ITF USA F9 | 04/05 15:00 | 26 | Collin Altamirano v Liam Caruana | 6-2,6-4 | |
| ITF USA F9 | 04/04 19:55 | 25 | Justin Butsch v Collin Altamirano | Retired | |
| ITF USA F8 | 03/24 20:30 | 28 | JC Aragone v Collin Altamirano | 6-0,6-4 | |
| ITF USA F8 | 03/24 01:00 | 27 | Collin Altamirano v Laurent Lokoli | 6-2,6-1 | |
| ITF USA F8 | 03/23 20:15 | 26 | Martin Redlicki v Collin Altamirano | 6-7,7-6,6-7 | |
| ITF USA F8 | 03/21 00:05 | 25 | Andre Goransson v Collin Altamirano | 2-6,3-6 | |
| ITF USA F7 | 03/15 18:55 | 26 | Mathias Bourgue v Collin Altamirano | 6-4,6-3 | |
| ITF USA F7 | 03/14 18:00 | 25 | Collin Altamirano v Antoine Bellier | 6-7,6-1,6-1 | |
| ITF Turchia F7 | 02/23 09:00 | 27 | Collin Altamirano v Dimitar Kuzmanov | 3-6,3-6 | |
| ITF Turchia F7 | 02/22 12:00 | 26 | Juan P Varillas v Collin Altamirano | 1-6,4-6 | |
| ITF Turchia F7 | 02/21 10:00 | 25 | Anil Yuksel v Collin Altamirano | 6-7,5-7 | |
| ITF Turchia F7 | 02/19 08:30 | 62 | Collin Altamirano v Juan Bautista Otegui | 6-2,6-2 | |
| ITF Turchia F7 | 02/18 12:30 | 62 | Collin Altamirano v Nico Mertens | 6-3,6-0 | |
| ITF Turchia F7 | 02/18 06:30 | 62 | Collin Altamirano v Sergio Luis H Ramirez | 6-2,6-0 | |
| ITF Turchia F6 | 02/15 08:40 | 26 | Attila Balazs v Collin Altamirano | 6-3,6-4 | |
| ITF Turchia F6 | 02/13 08:15 | 25 | Collin Altamirano v Davide Galoppini | 6-2,6-2 | |
| ITF Turchia F6 | 02/12 07:00 | 62 | Collin Altamirano v Jacopo Berrettini | 5-7,6-2,6-4 | |
| ITF Turchia F6 | 02/11 06:00 | 62 | Collin Altamirano v Daisuke Sumizawa | 6-0,6-1 | |
| ITF Turchia F6 | 02/10 06:00 | 62 | Collin Altamirano v Roberts Grinvalds | 6-0,6-3 | |
| ITF Turchia F5 | 02/09 08:00 | 27 | Alessandro Petrone v Collin Altamirano | 1-6,6-4,6-3 | |
| ITF Turchia F5 | 02/08 07:30 | 26 | Collin Altamirano v Wilson Leite | 6-4,1-6,6-3 | |
| ITF Turchia F5 | 02/06 07:30 | 25 | Collin Altamirano v Sefa Suluoglu | 6-0,6-0 | |
| ITF USA F2 | 01/14 19:00 | 29 | Emilio Gomez v Collin Altamirano | 1-6,5-7 | |
| ITF USA F2 | 01/13 19:00 | 28 | Kaichi Uchida v Collin Altamirano | 3-6,2-6 |