Stadium: Court 5 Round: 25 Ground: Hardcourt outdoor
| ITF Serbia F4 | 2018/08/26 07:00 | Pjevcevic, Petar v Petros Tsitsipas | 6-3,5-7,6-0 |
| ITF Serbia F3 | 2018/08/19 10:30 | Matic, Mile v Petros Tsitsipas | 6-2,7-5 |
| Coupe Davis | 2018/04/07 08:00 | Petros Tsitsipas v Egor Matvievici | 6-1,6-1 |
| ITF Greece F5 | 2018/03/25 08:00 | Niculae, Vlad Cristian v Petros Tsitsipas | 6-2,7-5 |
| ITF Greece F4 | 2018/03/20 08:00 | Petros Tsitsipas v Crepaldi, Erik | 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 Johnson, Luke | 2-6,2-6 |
| Challenger Quimper Qual | 2018/01/28 12:25 | Petros Tsitsipas v Tristan Lamasine | 3-6,1-6 |
| ITF France F16 | 2018/09/05 09:00 | Mertens, Yannick v Petit, Gabriel | 6-4,6-4 |
| ITF France F16 | 2018/09/03 15:00 | Petit, Gabriel v Mora, Maxime | 2-6,6-1,6-4 |
| ITF Ukraine F4 | 2018/08/29 11:45 | Petit, Gabriel v Dolgosheyev, Oleg | 7-6,2-6,3-6 |
| ITF Ukraine F4 | 2018/08/27 10:10 | Petit, Gabriel v Georgii Kravchenko | 6-3,7-5 |
| ITF Belarus F2 | 2018/08/14 12:20 | Petit, Gabriel v Klimov, Daniil | 6-7,3-6 |
| ITF Indonesia F3 | 2018/08/07 03:45 | Petit, Gabriel v Nitin Kumar Sinha | 6-3,3-6,4-6 |
| ITF Indonesia F2 | 2018/08/03 02:00 | Beale, Jeremy v Petit, Gabriel | 6-2,6-4 |
| ITF Indonesia F2 | 2018/08/02 05:20 | Robert, Quentin v Petit, Gabriel | 3-6,2-6 |