| ITF EE. UU. F14 | 06/16 16:00 | 28 | Deiton Baughman v Markos Kalovelonis | 6-1,6-3 | |
| ITF EE. UU. F14 | 06/15 21:00 | 27 | Eduardo A Eduardo A Torre v Markos Kalovelonis | 3-6,3-6 | |
| ITF EE. UU. F14 | 06/14 15:00 | 26 | Markos Kalovelonis v Jenson Brooksby | 6-4,6-4 | |
| ITF EE. UU. F14 | 06/12 15:00 | 25 | Collin Johns v Markos Kalovelonis | 4-6,3-6 | |
| ITF Bulgaria F1 | 05/17 07:00 | 26 | Markos Kalovelonis v Vasil Kirkov | 7-6,4-6,3-6 | |
| ITF Bulgaria F1 | 05/16 08:20 | 25 | Markos Kalovelonis v Daniil Zarichanskiy | 6-1,6-3 | |
| ITF Uzbekistán F2 | 04/25 09:00 | 26 | Markos Kalovelonis v Dzmitry Zhyrmont | 5-7,3-6 | |
| ITF Uzbekistán F2 | 04/24 14:45 | 25 | Shonigmatjon Shofayziyev v Markos Kalovelonis | 1-6,5-7 | |
| ITF Kazajstán F4 | 04/18 06:30 | 26 | Markos Kalovelonis v Teymuraz Gabashvili | 4-6,3-6 | |
| ITF Kazajstán F4 | 04/17 05:50 | 25 | Markos Kalovelonis v Matvey Khomentovskiy | 7-6,7-6 | |
| Copa Davis | 04/06 10:15 | 1 | Ljubomir Celebic v Markos Kalovelonis | 6-2,6-1 | |
| Copa Davis | 04/04 09:10 | - | Martins Podzus v Markos Kalovelonis | 3-6,4-6 | |
| ITF Grecia F5 | 03/28 06:00 | 25 | Markos Kalovelonis v Ioannis Stergiou | 3-6,2-6 | |
| ITF Grecia F4 | 03/23 14:00 | 27 | Markos Kalovelonis v Baptiste Crepatte | 3-6,2-6 | |
| ITF Grecia F4 | 03/23 09:40 | 26 | Lukas Klein v Markos Kalovelonis | 6-7,3-6 | |
| ITF Grecia F4 | 03/20 10:20 | 25 | Markos Kalovelonis v Fran Zvonimir Zgombic | 6-4,6-4 | |
| ITF Grecia F3 | 03/15 13:05 | 26 | Filippo Baldi v Markos Kalovelonis | 6-3,6-3 | |
| ITF Grecia F3 | 03/14 08:00 | 25 | Markos Kalovelonis v Alex Brenner | 6-2,6-2 | |
| ITF Grecia F2 | 03/09 11:55 | 27 | Danilo Petrovic v Markos Kalovelonis | 4-6,7-6,6-1 | |
| ITF Grecia F2 | 03/08 11:30 | 26 | Markos Kalovelonis v Adrian Bodmer | 2-6,6-1,7-6 | |
| ITF Grecia F2 | 03/06 09:30 | 25 | Markos Kalovelonis v Alex Brenner | 6-2,6-2 | |
| ITF Turquía F5 | 02/07 10:35 | 25 | Dragos Dima v Markos Kalovelonis | 6-1,6-4 | |
| ITF Turquía F4 | 01/30 07:30 | 25 | Markos Kalovelonis v Davide Galoppini | 3-6,2-6 | |
| ITF Grecia F9 | 11/15 08:00 | 25 | Markos Kalovelonis v Lucas Gomez | 2-6,3-6 | |
| ITF Grecia F8 | 11/09 10:40 | 26 | Christian Hirschmueller v Markos Kalovelonis | 6-4,6-7,6-1 | |
| ITF Grecia F8 | 11/07 08:00 | 25 | Markos Kalovelonis v Marco Bortolotti | 6-1,6-3 | |
| ITF Grecia F6 | 10/27 07:30 | 27 | Matteo Viola v Markos Kalovelonis | 6-1,6-4 | |
| ITF Grecia F6 | 10/26 07:00 | 26 | Markos Kalovelonis v Dominik Kellovsky | 7-6,7-6 | |
| ITF Grecia F6 | 10/24 12:05 | 25 | Markos Kalovelonis v Darko Jandric | 6-4,6-4 | |
| ITF Egipto F28 | 10/04 16:05 | 25 | Markos Kalovelonis v Mazen Osama | 2-6,3-6 |