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