Round: 62 Ground: Clay
| ITF Serbia F3 | 2018/08/18 07:00 | Valentin Ivanov v Mile Matic | 1-6,0-6 |
| ITF Serbia F2 | 2018/08/12 10:30 | Mile Matic v Harrison Lombe | 2-6,2-6 |
| ITF Bosnia and Herzegovina F3 Qual | 2018/05/27 10:30 | Ignacio Carou v Mile Matic | 4-6,6-3,6-2 |
| ITF Bosnia and Herzegovina F3 Qual | 2018/05/26 07:00 | Vladan Tadic v Mile Matic | 1-6,2-6 |
| ITF Bosnia and Herzegovina F2 Qual | 2018/05/20 07:00 | Mateo Bubalo v Mile Matic | 6-2,4-6,6-3 |
| ITF Bosnia and Herzegovina F2 Qual | 2018/05/19 07:00 | Mile Matic v Tadija Radovanovic | 6-4,6-2 |
| ITF Bosnia and Herzegovina F1 Qual | 2018/05/13 08:00 | Gorazd Srbljak v Mile Matic | 6-2,6-4 |
| ITF Croatia F2 | 2018/03/12 12:00 | Mile Matic v Tobias Sonne | 0-6,5-7 |
| Davis Cup | 2018/04/07 08:00 | Petros Tsitsipas v Egor Matvievici | 6-1,6-1 |
| ITF Greece F5 | 2018/03/25 08:00 | Vlad Cristian Niculae v Petros Tsitsipas | 6-2,7-5 |
| ITF Greece F4 | 2018/03/20 08:00 | Petros Tsitsipas v Erik Crepaldi | 4-6,0-6 |
| ITF Greece F3 | 2018/03/10 07:30 | Michalis Sakellaridis v Petros Tsitsipas | 6-3,6-2 |
| ITF Greece F1 | 2018/02/28 08:30 | Petros Tsitsipas v Luke Johnson | 2-6,2-6 |
| Challenger Quimper Qual | 2018/01/28 12:25 | Petros Tsitsipas v Tristan Lamasine | 3-6,1-6 |
| ITF Greece F10 | 2017/11/22 07:30 | Maksim Tikhomirov v Petros Tsitsipas | 6-3,6-0 |
| ITF Greece F7 | 2017/11/02 11:35 | Petros Tsitsipas v Andres Artunedo Martinavarr | 2-6,1-6 |