Stadium: Hard 1 Round: 26 Ground: Hardcourt outdoor
| ITF Greece F5 | 2018/03/28 06:00 | Markos Kalovelonis v Ioannis Stergiou | 3-6,2-6 |
| ITF Greece F7 | 2018/11/06 09:10 | Ioannis Stergiou v Stefan Palosi | 6-4,7-5 |
| ITF Greece F6 | 2018/10/30 10:55 | Ioannis Stergiou v Austin Rapp | 5-7,5-7 |
| ITF Italy F20 Qual | 2018/07/22 13:00 | Ioannis Stergiou v Ettore Capello | 6-7,5-7 |
| ITF Italy F20 Qual | 2018/07/21 07:30 | Ioannis Stergiou v Elio Jose Ribeiro Lago | 4-6,6-2,6-4 |
| ITF Italy F19 | 2018/07/16 19:00 | Tomas Martin Etcheverry v Ioannis Stergiou | 6-2,7-6 |
| ITF Bosnia and Herzegovina F2 | 2018/05/25 08:00 | Nerman Fatic v Ioannis Stergiou | 6-4,6-0 |
| ITF Bosnia and Herzegovina F2 | 2018/05/24 11:35 | Ioannis Stergiou v Danylo Kalenichenko | 6-1,7-6 |
| ITF Bosnia and Herzegovina F2 | 2018/05/23 12:30 | Darko Jandric v Ioannis Stergiou | 0-6,3-6 |
| ITF Greece F7 | 2018/11/06 11:15 | Jake Hersey v Markos Kalovelonis | 6-7,3-6 |
| ITF Greece F6 | 2018/11/01 10:30 | Shahar Elbaz v Markos Kalovelonis | 7-5,6-1 |
| ITF Greece F6 | 2018/10/31 09:00 | Stamatios Kapiris v Markos Kalovelonis | 3-6,2-6 |
| ITF Lebanon F2 | 2018/10/02 13:00 | Hady Habib v Markos Kalovelonis | 6-1,6-7,6-3 |
| ITF Lebanon F1 | 2018/09/27 13:00 | Fabien Reboul v Markos Kalovelonis | 6-2,6-7,6-1 |
| ITF Lebanon F1 | 2018/09/25 13:00 | Markos Kalovelonis v Luca Tomasetto | 6-3,6-2 |
| ITF Egypt F18 | 2018/09/13 07:30 | Neven Krivokuca v Markos Kalovelonis | 6-4,6-0 |
| ITF Russia F7 | 2018/08/23 07:00 | Markos Kalovelonis v Konstantin Kravchuk | 2-6,2-6 |