| ITF Turkey F41 | 12/19 10:30 | - | Kalovelonis, Markos v Abdel-Aziz, Mohamed | 7-5,5-1 | |
| ITF Greece F8 | 11/16 08:00 | 27 | Pervolarakis, Michail v Kalovelonis, Markos | 6-4,6-3 | |
| ITF Greece F8 | 11/15 08:00 | 26 | Ibrahim, Hasan v Kalovelonis, Markos | 6-7,2-6 | |
| ITF Greece F8 | 11/13 09:00 | 25 | Pedro Vives Marcos v Kalovelonis, Markos | 2-6,7-6,4-6 | |
| ITF Greece F7 | 11/10 08:00 | 27 | Pervolarakis, Michail v Kalovelonis, Markos | 7-6,6-4 | |
| ITF Greece F7 | 11/08 11:10 | 26 | Stergiou, Ioannis v Kalovelonis, Markos | 2-6,4-6 | |
| ITF Greece F7 | 11/06 11:15 | 25 | Hersey, Jake v Kalovelonis, Markos | 6-7,3-6 | |
| ITF Greece F6 | 11/01 10:30 | 26 | Elbaz, Shahar v Kalovelonis, Markos | 7-5,6-1 | |
| ITF Greece F6 | 10/31 09:00 | 25 | Kapiris, Stamatis v Kalovelonis, Markos | 3-6,2-6 | |
| ITF Lebanon F2 | 10/02 13:00 | 25 | Hady Habib v Kalovelonis, Markos | 6-1,6-7,6-3 | |
| ITF Lebanon F1 | 09/27 13:00 | 26 | Reboul, Fabien v Kalovelonis, Markos | 6-2,6-7,6-1 | |
| ITF Lebanon F1 | 09/25 13:00 | 25 | Kalovelonis, Markos v Luca Tomasetto | 6-3,6-2 | |
| Egypt F18, Singles Qualifying | 09/13 07:30 | 26 | Krivokuca, Neven v Kalovelonis, Markos | 6-4,6-0 | |
| ITF Russia F7 | 08/23 07:00 | 27 | Kalovelonis, Markos v Kravchuk, Konstantin | 2-6,2-6 | |
| ITF Russia F7 | 08/22 10:35 | 26 | Kalovelonis, Markos v Alexandr Binda | 6-4,6-4 | |
| ITF Russia F7 | 08/20 07:00 | 25 | Kalovelonis, Markos v Bogdan Bobrov | 7-6,6-2 | |
| ITF Russia F6 | 08/14 09:45 | 25 | Ratniuk, Maxim v Kalovelonis, Markos | 6-4,7-5 | |
| ITF Estonia F1 | 07/21 07:00 | 29 | Kalovelonis, Markos v Madaras, Dragos Nicolae | 2-6,3-6 | |
| ITF Estonia F1 | 07/20 09:00 | 28 | Kalovelonis, Markos v Niklas-Salminen, Patrick | 6-4,7-5 | |
| ITF Estonia F1 | 07/19 09:00 | 27 | Emil Ruusuvuori v Kalovelonis, Markos | 6-7,5-7 | |
| ITF Estonia F1 | 07/18 08:00 | 26 | Siimar, Kristofer v Kalovelonis, Markos | 1-6,1-6 | |
| ITF Estonia F1 | 07/17 10:00 | 25 | Siim Troost v Kalovelonis, Markos | 5-7,5-7 | |
| ITF USA F18 | 06/29 18:05 | 27 | Kalovelonis, Markos v Gomez, Alejandro | 6-3,3-6,4-6 | |
| ITF USA F18 | 06/28 14:00 | 26 | Kalovelonis, Markos v Goetz, Ryan | 6-3,6-2 | |
| ITF USA F18 | 06/27 19:10 | 25 | Kalovelonis, Markos v Gamble, Luke Jacob | 7-6,6-2 | |
| ITF USA F16 | 06/24 14:30 | 29 | Kalovelonis, Markos v Alex Rybakov | 1-6,6-7 | |
| ITF USA F16 | 06/23 14:30 | 28 | Ross, Gianni v Kalovelonis, Markos | 6-7,5-7 | |
| ITF USA F16 | 06/22 19:00 | 27 | Arconada, Jordi v Kalovelonis, Markos | 6-7,2-6 | |
| ITF USA F16 | 06/21 18:30 | 26 | Kalovelonis, Markos v Cannon Kingsley | 6-3,6-1 | |
| ITF USA F16 | 06/20 17:30 | 25 | Kalovelonis, Markos v Ismailov, Temur | 7-6,6-1 |