Stadium: Hard Court Center Round: 44 Ground: Hardcourt outdoor
| ITF M15 Curtea de Arges | 2020/09/16 07:00 | Gabriel Donev v Dembek, Michal | 6-3,6-1 |
| ITF M15 Curtea de Arges | 2020/09/17 11:05 | Duje Ajdukovic v Gabriel Donev | 7-5,7-6 |
| ITF M15 Curtea de Arges | 2020/09/16 07:00 | Gabriel Donev v Dembek, Michal | 6-3,6-1 |
| ITF M15 Curtea de Arges | 2020/09/15 08:40 | Gabriel Donev v Valentin Vanta | 6-2,6-1 |
| ITF M15 Curtea de Arges | 2020/09/14 08:30 | Gabriel Donev v Gabi Adrian Boitan | 6-2,6-0 |
| ITF - M15 Doha | 2020/03/11 15:10 | Wattanakul, Pol v Gabriel Donev | 6-1,6-2 |
| Burgas, Singles Qualifying M-ITF-BUL-05A | 2019/10/09 13:45 | Gabriel Donev v Lazarov, Alexandar | 7-5,2-6,5-7 |
| ITF M15 Chornomorsk | 2019/09/26 09:10 | Strelchenko, Daniil v Gabriel Donev | 3-6,2-6 |
| ITF M15 Chornomorsk | 2019/09/24 07:00 | Mladenov, Vasko v Gabriel Donev | 4-6,4-6 |
| ITF - M15 Héraklion | 2020/10/25 09:00 | Caripi, Vasilios v Dembek, Michal | 0-6,3-6 |
| ITF M15 Curtea de Arges | 2020/09/16 07:00 | Gabriel Donev v Dembek, Michal | 6-3,6-1 |
| ITF - M15 Bucarest | 2020/09/10 06:55 | Dembek, Michal v Dan Added | 4-6,4-6 |
| ITF - M15 Bucarest | 2020/09/09 09:20 | Dembek, Michal v Frunza, Nicolae | 6-0,7-6 |
| ITF M25 Poznan | 2020/08/25 11:55 | Felipe Meligeni Rodrigues Alves v Dembek, Michal | 7-5,6-2 |
| Polish National Tour | 2020/07/30 10:00 | Kolasinski, Filip v Dembek, Michal | 4-6,3-6 |
| Polish National Tour | 2020/07/29 07:00 | Cislo, Mateusz v Dembek, Michal | 1-6,1-6 |
| Polish National Tour | 2020/07/27 08:00 | Kamil Majchrzak v Dembek, Michal | 6-3,7-5 |