Stadium: Court 2 Round: 26 Ground: Hardcourt outdoor
| ITF Bulgaria F1 | 2018/05/16 08:20 | Markos Kalovelonis v Daniil Zarichanskiy | 6-1,6-3 |
| ITF Uzbekistan F2 | 2018/04/25 09:00 | Markos Kalovelonis v Dzmitry Zhyrmont | 5-7,3-6 |
| ITF Uzbekistan F2 | 2018/04/24 14:45 | Shonigmatjon Shofayziyev v Markos Kalovelonis | 1-6,5-7 |
| ITF Kazakhstan F4 | 2018/04/18 06:30 | Markos Kalovelonis v Teymuraz Gabashvili | 4-6,3-6 |
| ITF Kazakhstan F4 | 2018/04/17 05:50 | Markos Kalovelonis v Matvey Khomentovskiy | 7-6,7-6 |
| Davis Cup | 2018/04/06 10:15 | Ljubomir Celebic v Markos Kalovelonis | 6-2,6-1 |
| Davis Cup | 2018/04/04 09:10 | Martins Podzus v Markos Kalovelonis | 3-6,4-6 |
| ITF Greece F5 | 2018/03/28 06:00 | Markos Kalovelonis v Ioannis Stergiou | 3-6,2-6 |
| ITF Bulgaria F1 | 2018/05/16 07:00 | Venci Ivanov v Vasil Kirkov | 1-6,2-6 |
| ITF Israel F6 | 2018/05/12 07:30 | Matias Franco Descotte v Vasil Kirkov | 6-4,6-3 |
| ITF Israel F6 | 2018/05/11 07:30 | Alon Elia v Vasil Kirkov | 7-5,1-6,3-6 |
| ITF Israel F6 | 2018/05/10 08:25 | Vasil Kirkov v Mor Bulis | 6-3,1-6,6-3 |
| ITF Israel F6 | 2018/05/08 11:30 | Vasil Kirkov v Orel Ovil | 6-4,6-2 |
| ITF Poland F1 | 2018/05/01 07:30 | Michal Dembek v Vasil Kirkov | 6-1,6-0 |
| ITF Poland F1 | 2018/04/30 07:00 | Vasil Kirkov v Dominik Nazaruk | 6-4,6-3 |
| ITF USA F10 | 2018/04/12 17:20 | Vasil Kirkov v Collin Altamirano | 1-6,7-5,2-6 |