Stadium: Court 1 Round: 26 Ground: Hardcourt outdoor
| ITF Bulgaria F1 | 2018/05/16 08:35 | Gabriel Donev v Glvac, Andrej | 5-7,6-3,6-0 |
| ITF Turkey F11 | 2018/03/23 08:00 | Gabriel Donev v Peter Heller | 1-6,6-1,3-6 |
| ITF Turkey F11 | 2018/03/22 07:30 | Nedovyesov, Aleksandr v Gabriel Donev | 5-7,2-6 |
| ITF Turkey F11 | 2018/03/20 09:30 | Gabriel Donev v Juan Bautista Otegui | 4-6,6-3,7-5 |
| ITF Turkey F11 | 2018/03/19 07:00 | Gabriel Donev v Assuncao Garla, Felipe | 6-4,6-4 |
| ITF Turkey F11 | 2018/03/18 07:00 | Gabriel Donev v Labna, Ramy | 6-2,6-3 |
| ITF Turkey F11 | 2018/03/17 08:30 | Gabriel Donev v Bugaj, Martin | 6-2,7-5 |
| Turkey F10, Singles Qualifying | 2018/03/13 07:30 | Camilo Ugo Carabelli v Gabriel Donev | 6-4,6-4 |
| ITF Bulgaria F1 | 2018/05/15 08:25 | Penev, Ivan v Seifert, Stefan | 4-6,2-6 |
| ITF Greece F5 | 2018/03/28 06:00 | Petr Michnev v Seifert, Stefan | 7-6,7-6 |
| ITF Greece F4 | 2018/03/25 09:00 | Seifert, Stefan v Tomas Barrios Vera | 6-7,6-2,6-2 |
| ITF Greece F4 | 2018/03/24 08:50 | Rudolf Molleker v Seifert, Stefan | 0-6,2-6 |
| ITF Greece F4 | 2018/03/23 12:00 | Sude, Jakob v Seifert, Stefan | 4-6,6-7 |
| ITF Greece F4 | 2018/03/23 08:00 | Seifert, Stefan v Gijs Brouwer | 7-5,7-6 |
| ITF Greece F4 | 2018/03/21 11:30 | Seifert, Stefan v Martniez, Mateo Nicolas | 4-6,6-2,6-2 |
| ITF Greece F4 | 2018/03/19 09:30 | Seifert, Stefan v Petrovic, Stefan | 6-3,6-2 |