Stadium: Court 4 Round: 26 Ground: Hardcourt indoor
| ITF - M25 Columbus | 2023/11/15 20:30 | Nikita Filin v Collin Altamirano | 6-4,1-6,2-6 |
| Challenger - Calgary | 2023/11/05 17:55 | Alafia Ayeni v Collin Altamirano | 7-6,6-4 |
| ITF - M25 Edmonton | 2023/11/02 16:00 | Giles Hussey v Collin Altamirano | 6-4,6-3 |
| ITF - M25 Edmonton | 2023/10/31 23:25 | Collin Altamirano v Brayden Schnur | 6-4,2-6,6-4 |
| ITF M25 - Harlingen | 2023/10/26 18:50 | Marcus McDaniel v Collin Altamirano | 6-2,6-3 |
| ITF M25 - Harlingen | 2023/10/25 16:05 | Joao Vitor Goncalves Ceolin v Collin Altamirano | 4-6,4-6 |
| ITF - M25 Takasaki | 2023/09/23 01:40 | Makoto Ochi v Collin Altamirano | 6-7,6-1,6-2 |
| ITF - M25 Takasaki | 2023/09/22 01:00 | Kazuki Nishiwaki v Collin Altamirano | 3-6,1-6 |
| ITF - M25 Columbus | 2023/11/15 19:10 | Jack Anthrop v Shunsuke Mitsui | 6-4,6-7,2-6 |
| ITF - M15 Las Vegas | 2023/10/21 20:30 | Bernard Tomic v Shunsuke Mitsui | 6-3,3-6,6-4 |
| ITF - M15 Las Vegas | 2023/10/20 19:25 | Shunsuke Mitsui v Alex Martinez | 6-1,6-3 |
| ITF - M15 Las Vegas | 2023/10/19 18:00 | Shunsuke Mitsui v Colin Markes | 6-2,6-2 |
| ITF - M15 Las Vegas | 2023/10/18 20:25 | Alexander Cozbinov v Shunsuke Mitsui | 2-6,4-6 |
| ITF M15 Ithaca | 2023/10/04 14:00 | Shunsuke Mitsui v Perry Gregg | 3-6,6-7 |
| ITF - M15 Champaign | 2023/09/16 15:00 | Liam Draxl v Shunsuke Mitsui | 6-2,6-2 |
| ITF - M15 Champaign | 2023/09/15 15:00 | Shunsuke Mitsui v Jack Loutit | 7-6,6-2 |