| ITF Spagna F22 | 07/20 09:00 | 26 | Marc Giner v Collin Altamirano | 7-6,6-1 | |
| ITF Spagna F22 | 07/19 07:30 | 25 | Patrick Mayer v Collin Altamirano | 4-6,5-7 | |
| ITF Belgio F4 | 07/08 10:20 | 27 | Collin Altamirano v Yannick Vandenbulcke | Retired | |
| ITF Belgio F4 | 07/06 15:15 | 26 | Jolan Cailleau v Collin Altamirano | 4-6,2-6 | |
| ITF Belgio F4 | 07/05 07:00 | 25 | Bart Stevens v Collin Altamirano | 6-2,3-6,2-6 | |
| ITF Belgio F3 | 06/28 12:50 | 25 | Christoph Negritu v Collin Altamirano | 4-6,6-2,6-2 | |
| ITF Belgio F2 | 06/22 08:00 | 25 | Juan Carlos Saez v Collin Altamirano | 6-2,6-4 | |
| ITF Belgio 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 | |
| Challenger Charlottesville | 11/04 00:45 | 45 | Stefan Kozlov v Collin Altamirano | 6-3,6-0 | |
| ITF USA F30 | 10/13 15:00 | 25 | Collin Altamirano v Alexander Ritschard | 4-6,1-6 | |
| ITF USA F27 | 09/25 17:00 | 27 | Collin Altamirano v Deiton Baughman | 3-6,0-6 | |
| ITF USA F27 | 09/24 19:15 | 26 | Collin Altamirano v Martin Redlicki | 6-4,6-4 | |
| ITF USA F27 | 09/23 18:20 | 25 | Hans Hach Verdugo v Collin Altamirano | 2-6,2-6 | |
| ITF USA F26 | 09/19 18:35 | 28 | Collin Altamirano v Mackenzie McDonald | 2-6,2-6 | |
| ITF USA F26 | 09/18 18:30 | 27 | Collin Altamirano v Daniel Garza | 6-2,6-0 | |
| ITF USA F26 | 09/17 19:40 | 26 | Collin Altamirano v Martin Redlicki | 6-4,3-6,6-0 | |
| ITF USA F26 | 09/16 18:40 | 25 | Marcos Giron v Collin Altamirano | 6-3,3-6,3-6 | |
| ITF Italia F22 | 08/11 13:00 | 25 | Pietro Rondoni v Collin Altamirano | 5-7,7-5,6-1 | |
| ITF Italia F22 - Qual. | 08/09 15:20 | 54 | Collin Altamirano v Gianluca Di Nicola | 6-2,2-6,7-6 | |
| ITF Italia F22 - Qual. | 08/09 08:30 | 54 | Collin Altamirano v Giovanni Fonio | 6-3,6-4 | |
| ITF Italia F21 | 08/07 13:00 | 28 | Marco Bortolotti v Collin Altamirano | 6-2,6-0 | |
| ITF Italia F21 | 08/06 14:10 | 27 | Collin Altamirano v Omar Giacalone | 2-6,6-4,6-2 | |
| ITF Italia F21 | 08/05 09:55 | 26 | Collin Altamirano v Daniel Masur | 6-2,6-2 | |
| ITF Italia F21 | 08/04 12:35 | 25 | Maximilian Marterer v Collin Altamirano | 5-7,4-6 | |
| ITF Italia F20 | 07/27 12:00 | 25 | Collin Altamirano v Fabio Mercuri | 6-7,7-6,1-6 | |
| ITF Italia F17 | 07/07 15:00 | - | Collin Altamirano v Stefano Travaglia | 2-6,6-7 | |
| US Open - Qual. | 08/21 23:00 | 45 | Ricardas Berankis v Collin Altamirano | 2-6,6-1,6-1 | |
| US Open - Qual. | 08/20 15:00 | 44 | Luca Vanni v Collin Altamirano | 4-6,2-6 |