Stadium: Court 14 Round: 25 Ground: Clay
| ITF M15 Austin | 2019/11/21 18:25 | Collin Altamirano v Preston Brown | 6-2,6-0 |
| ITF M25 Southaven | 2024/08/07 23:00 | Leo Vithoontien v Preston Brown | 6-3,6-3 |
| ITF M15 Huamantla | 2024/07/23 15:00 | Kousuke Ogura v Preston Brown | 7-6,6-3 |
| ITF M15 Huamantla | 2024/07/16 17:40 | Preston Brown v Alan Kam | 4-6,4-6 |
| ITF M25 Trelew | 2024/05/10 16:55 | Preston Brown v Kaichi Uchida | 1-6,3-6 |
| ITF M25 Trelew | 2024/05/09 16:45 | Preston Brown v Thiago Cigarran | 6-4,3-6,6-2 |
| ITF M25 Trelew | 2024/05/08 15:40 | Preston Brown v Gonzalo Ariel Karakachian | 6-3,6-3 |
| ITF M25 Anapoima | 2024/05/01 15:00 | Nicolas G Longo v Preston Brown | 5-7,6-4,6-1 |
| ITF M25 Mosquera | 2024/04/22 17:55 | Juan Sebastian Gomez v Preston Brown | 6-4,6-3 |
| Challenger Lincoln | 2024/08/04 18:50 | Stefan Kozlov v Collin Altamirano | 6-4,7-6 |
| ITF M25 Edwardsville | 2024/07/31 12:55 | Ryan Fishback v Collin Altamirano | 2-6,6-3,6-2 |
| ITF M15 Lakewood | 2024/07/02 20:00 | Jack Anthrop v Collin Altamirano | 6-1,6-3 |
| ITF M15 Los Angeles | 2024/06/27 18:00 | Collin Altamirano v Keegan Smith | 6-4,2-6,3-6 |
| ITF M15 Los Angeles | 2024/06/26 18:00 | Collin Altamirano v Maxwell McKennon | 6-4,6-2 |
| ITF M15 Rancho Santa Fe | 2024/06/21 16:55 | Collin Altamirano v Matthew Summers | 6-7,5-7 |
| ITF M15 Rancho Santa Fe | 2024/06/20 16:55 | Collin Altamirano v Derek Pham | 4-6,6-2,7-6 |
| ITF M15 Rancho Santa Fe | 2024/06/18 18:00 | Justin Boulais v Collin Altamirano | 7-5,6-7,4-6 |