Round: 44 Ground: Clay
| ITF Panama F4 | 2018/11/21 14:00 | Ivan Sergeyev v Maksim Tikhomirov | 7-6,7-5 |
| ITF Panama F4 | 2018/11/19 20:30 | Noah Berry v Ivan Sergeyev | 1-6,2-6 |
| ITF Ukraine F4 | 2018/08/30 09:25 | Ivan Sergeyev v Alessandro Petrone | 0-6,7-6,2-6 |
| ITF Ukraine F4 | 2018/08/29 14:30 | Roman Khassanov v Ivan Sergeyev | 6-7,1-6 |
| ITF Ukraine F4 | 2018/08/28 12:05 | Ivan Sergeyev v Martin Fekiac | 5-7,6-3,6-0 |
| ITF Ukraine F4 | 2018/08/27 07:00 | Matteo Curci v Ivan Sergeyev | 3-6,2-6 |
| ITF Ukraine F4 | 2018/08/26 10:00 | Ivan Sergeyev v Luigi Sorrentino | 7-5,7-6 |
| Challenger Panama City Qual | 2018/03/31 14:30 | Alex Lawson v Ivan Sergeyev | 2-6,2-6 |
| ITF Ukraine F4 | 2018/08/27 07:00 | Roman Boychuk v Oleksandr Varichenko | 6-2,6-1 |
| ITF Ukraine F4 | 2018/08/26 07:00 | Constantinos Papavasiliou v Oleksandr Varichenko | 0-6,3-6 |
| ITF Ukraine F4 | 2018/08/25 07:00 | Oleksandr Varichenko v Yuriy Kryvoy | 6-2,1-6,7-5 |
| ITF Ukraine F3 | 2018/05/22 12:35 | Jordan Correia v Oleksandr Varichenko | 6-2,6-4 |
| ITF Ukraine F3 | 2018/05/20 07:00 | Oleksandr Varichenko v Nazar Achour | 6-4,6-3 |
| ITF Ukraine F3 | 2018/05/19 09:30 | Dmytro Slyepkan v Oleksandr Varichenko | 1-6,0-6 |
| ITF Ukraine F2 | 2018/05/14 07:00 | Yan Bondarevskiy v Oleksandr Varichenko | 6-2,6-2 |
| ITF Ukraine F2 | 2018/05/13 07:00 | Aleksandr Braynin v Oleksandr Varichenko | 4-6,4-6 |