| UTR Pro Sofia | 2023/09/06 05:00 | Janos Fekete v Gabriel Donev | 0-6,6-3,3-6 |
| UTR Pro Sofia | 2023/09/05 09:02 | Sergo Sikharulidze v Gabriel Donev | 0-6,3-6 |
| ITF M15 Kursumlijska Banja | 2023/08/30 09:05 | Gabriel Donev v Alessandro Bellifemine | 3-6,6-4,2-6 |
| ITF M15 Targu Jiu | 2023/08/15 13:45 | Lorenzo Joaquin Rodriguez v Gabriel Donev | 6-7,7-6,6-4 |
| ITF M15 Curtea de Arges | 2023/08/09 10:35 | Gabriel Donev v Luciano Emanuel Ambrogi | 0-6,4-6 |
| ITF M25 Pitesti | 2023/08/01 06:30 | Gabriel Donev v Quentin Folliot | 6-4,5-7,1-6 |
| ITF M15 Sofia | 2023/07/04 09:40 | Gabriel Donev v Denis Klok | 5-7,1-6 |
| ITF M15 Belgrade | 2023/06/28 12:30 | Miljan Zekic v Gabriel Donev | 6-4,6-3 |
| UTR Pro Sofia | 2023/09/05 07:42 | Janos Fekete v Christos Keisidis | 6-0,6-1 |
| UTR Pro Sofia | 2023/09/04 07:04 | Christos Keisidis v Milen Ianakiev | 3-6,5-7 |
| UTR Pro Olomouc | 2023/07/09 06:00 | Christos Keisidis v Adam Jurajda | 6-4,6-2 |
| UTR Pro Olomouc | 2023/07/08 09:47 | Bekkhan Atlangeriev v Christos Keisidis | 2-6,1-6 |
| UTR Pro Olomouc | 2023/07/06 07:30 | Christos Keisidis v Petr Iamachkine | 6-4,5-2 |
| UTR Pro Olomouc | 2023/07/05 08:05 | Christos Keisidis v Oleg Prihodko | 2-6,1-6 |
| UTR Pro Olomouc | 2023/07/04 06:00 | Christos Keisidis v Artem Podorozhnyi | 4-6,6-3,2-6 |
| UTR Pro Olomouc | 2023/07/03 11:30 | Christos Keisidis v Janos Fekete | 7-6,3-6,1-6 |