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