Stadium: Main Court Round: 44 Ground: Clay
| 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 |
| ITF M25 Jablonec Nad Nisou | 2023/05/28 13:00 | Mikolaj Lis v Jonas P Hartenstein | 1-6,2-6 |
| ITF M15 Tbilisi | 2023/05/02 07:50 | Mikolaj Lis v Kirill Kivattsev | 4-6,4-6 |
| ITF M25 Tbilisi | 2023/05/01 06:00 | Maksim Shin v Mikolaj Lis | 5-7,6-1,8-10 |
| ITF M25 Bielsko Biala | 2023/08/14 11:30 | Norbert Marosik v Michalis Sakellaridis | 7-5,6-0 |
| ITF M25 Bielsko Biala | 2023/08/13 12:30 | Norbert Marosik v Nikola Puntaric | 4-6,7-5,10-8 |
| ITF M25 Poprad | 2023/06/19 08:00 | Norbert Marosik v Sebastian Sec | 1-6,2-6 |
| ITF M25 Poprad | 2023/06/18 11:00 | Jakub Katuch v Norbert Marosik | 6-7,1-6 |