Stadium: Court 3 Round: 54 Ground: Clay
| ITF M25 Naples | 2024/02/19 16:00 | Collin Altamirano v Oren Vasser | 7-5,6-3 |
| ITF M15 Palm Coast | 2024/02/13 15:00 | Collin Altamirano v Ivan Marrero Curbelo | 6-2,6-7,4-10 |
| Challenger Cleveland | 2024/01/29 18:30 | Patrick Brady v Collin Altamirano | 6-3,6-2 |
| Challenger Cleveland | 2024/01/28 22:00 | Collin Altamirano v Dan Martin | 7-6,6-3 |
| ITF M25 Wesley Chapel | 2024/01/24 18:35 | Harrison Adams v Collin Altamirano | 7-5,6-4 |
| ITF M25 Columbus | 2023/11/16 17:30 | Collin Altamirano v Shunsuke Mitsui | 7-5,3-6,3-6 |
| 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 Naples | 2024/02/19 17:00 | Oliver Okonkwo v Nicolas Kobelt | 6-3,6-2 |
| Challenger Champaign | 2023/11/13 20:00 | Oliver Okonkwo v Hunter Heck | 6-7,2-6 |
| Challenger Champaign | 2023/11/12 23:10 | Christian Harrison v Oliver Okonkwo | 4-6,6-3,6-7 |
| ITF M15 Champaign | 2023/09/14 19:35 | Oliver Okonkwo v Patrick Maloney | 3-6,1-6 |
| ITF M15 Champaign | 2023/09/13 23:15 | Oliver Okonkwo v Facundo Yunis | 6-1,4-6,6-1 |
| ITF M25 Decatur | 2023/08/03 13:55 | Shunsuke Mitsui v Oliver Okonkwo | 7-6,6-4 |
| ITF M25 Decatur | 2023/08/01 16:05 | Oliver Okonkwo v Semen Pankin | 6-2,1-6,10-8 |
| ITF M25 Edwardsville | 2023/07/24 14:00 | Kenta Miyoshi v Oliver Okonkwo | 6-3,6-4 |