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 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 Bosnia and Herzegovina F1 | 2018/05/15 08:00 | Ioannis Stergiou v Petr Hajek | 6-1,3-6,6-7 |
| Davis Cup | 2018/04/06 08:00 | Rrezart Cungu v Ioannis Stergiou | 7-6,6-2 |
| ITF Russia F7 | 2018/08/23 07:00 | Markos Kalovelonis v Konstantin Kravchuk | 2-6,2-6 |
| ITF Russia F7 | 2018/08/22 10:35 | Markos Kalovelonis v Alexandr Binda | 6-4,6-4 |
| ITF Russia F7 | 2018/08/20 07:00 | Markos Kalovelonis v Bogdan Bobrov | 7-6,6-2 |
| ITF Russia F6 | 2018/08/14 09:45 | Maxim Ratniuk v Markos Kalovelonis | 6-4,7-5 |
| ITF Estonia F1 | 2018/07/21 07:00 | Markos Kalovelonis v Dragos Nicolae Madaras | 2-6,3-6 |
| ITF Estonia F1 | 2018/07/20 09:00 | Markos Kalovelonis v Patrik Niklas-Salminen | 6-4,7-5 |
| ITF Estonia F1 | 2018/07/19 09:00 | Emil Ruusuvuori v Markos Kalovelonis | 6-7,5-7 |
| ITF Estonia F1 | 2018/07/18 08:00 | Kristofer Siimar v Markos Kalovelonis | 1-6,1-6 |