Stadium: Court 4 Round: 54 Ground: Hardcourt outdoor
| ITF M25 Naples | 2024/02/20 16:30 | Collin Altamirano v Oliver Okonkwo | 6-3,6-0 |
| 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 M15 East Lansing | 2023/11/15 16:25 | Fons Van Sambeek v Nick Lagaev | 7-6,6-2 |
| ITF M15 East Lansing | 2023/11/14 14:00 | Alexander Brown v Nick Lagaev | 1-6,4-6 |
| ITF M15 Pittsburgh | 2023/07/27 15:00 | Juan Carlos Aguilar v Nick Lagaev | 6-4,6-4 |
| ITF M15 Pittsburgh | 2023/07/25 14:00 | Emmett Ward v Nick Lagaev | 4-6,0-6 |
| ITF M15 Pittsburgh | 2023/07/24 14:00 | Brett Winters v Nick Lagaev | 2-6,1-6 |
| ITF M25 Laval | 2023/07/11 19:45 | Alexander Rozin v Nick Lagaev | 6-4,6-4 |
| ITF M25 Decatur | 2022/08/04 19:30 | Murphy Cassone v Nick Lagaev | 6-1,3-6,7-5 |
| ITF M25 Decatur | 2022/08/03 19:05 | Francisco Pini v Nick Lagaev | 3-6,2-6 |