Estadio: Court 5 Round: 44 Ground: Clay
| ITF M15 Viena | 2023/08/28 10:30 | Jakub Ostajewski v Luka Miklavcic | 2-6,4-6 |
| ITF M15 Viena | 2023/08/28 08:00 | Daniel Orlita v Jakub Ostajewski | 6-2,2-6,4-10 |
| ITF M15 Caslano | 2023/08/20 11:35 | Francesco Liucci v Jakub Ostajewski | 6-3,6-3 |
| ITF M15 Ueberlingen | 2023/08/14 12:30 | Gregor Ramskogler v Jakub Ostajewski | 6-4,6-1 |
| ITF M25 Lódz | 2023/08/07 13:30 | Francesco Ferrari v Jakub Ostajewski | 6-3,6-3 |
| ITF M25 Edwardsville | 2023/07/24 14:00 | Jakub Ostajewski v Bjorn Swenson | 4-6,2-6 |
| ITF M25 Santo Domingo | 2023/06/18 14:00 | Jakub Ostajewski v Maxime St-Hilaire | 1-6,0-6 |
| ITF M25 Jablonec Nad Nisou | 2023/05/28 11:30 | Tomas Zlatohlavek v Jakub Ostajewski | 6-3,6-1 |
| ITF M15 Szczawno | 2023/08/28 10:00 | Radovan Michalik v Marcel Politowicz | 6-1,6-0 |
| ITF M25 Poznan | 2023/08/20 10:30 | Dimitris Sakellaridis v Marcel Politowicz | 6-4,7-5 |
| ITF M25 Bielsko-Biala | 2023/08/14 14:00 | Ondrej Horak v Marcel Politowicz | 6-1,6-4 |
| ITF M25 Bielsko-Biala | 2023/08/14 09:00 | Marcel Politowicz v Dimitris Sakellaridis | 3-6,6-2,12-10 |
| ITF M25 Bielsko-Biala | 2023/08/13 09:30 | Marcel Politowicz v Mateusz Cislo | 6-7,6-1,10-4 |
| ITF M25 Lódz | 2023/08/07 07:30 | Maciej Kos v Marcel Politowicz | 6-1,7-6 |
| ITF M15 Wroclaw | 2023/06/25 09:00 | Marcel Politowicz v Tomas Jirousek | 2-6,2-6 |
| ITF M15 Monastir | 2023/06/19 08:30 | Madhwin Kamath v Marcel Politowicz | 6-2,6-1 |