Ground: Carpet indoor
| ITF M15 Szczawno | 2023/08/28 10:00 | Mikolaj Lis v Maciej Matuszczyk | 6-4,3-6,8-10 |
| ITF M25 Bielsko Biala | 2023/08/16 12:40 | Mikolaj Lis v Stephanos Schinas | 6-3,4-6,6-7 |
| ITF M25 Bielsko Biala | 2023/08/14 16:15 | Mikolaj Lis v Norbert Marosik | 6-2,7-6 |
| ITF M25 Bielsko Biala | 2023/08/14 10:30 | Mikolaj Lis v Martins Rocens | 6-7,6-4,11-9 |
| ITF M25 Lodz | 2023/08/07 13:30 | Maciej Matuszczyk v Mikolaj Lis | 6-1,7-6 |
| ITF M25 Lodz | 2023/08/07 07:30 | Edoardo Cherie Ligniere v Mikolaj Lis | 1-6,3-6 |
| ITF M15 Wroclaw | 2023/06/26 09:00 | Mikolaj Lis v Marc Antoine Gaillard | 3-6,1-6 |
| ITF M15 Nyiregyhaza | 2023/06/05 09:30 | Petro Orlando Fellin v Mikolaj Lis | 6-3,6-0 |
| 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 |
| ITF M25 Skopje | 2023/06/06 07:30 | Tymur Bieldiugin v Christos Keisidis | 7-6,2-6,10-8 |
| ITF M25 Skopje | 2023/06/05 07:55 | Erik Vladimirov v Christos Keisidis | 4-6,3-6 |