Stadium: Court 5 Round: 44 Ground: Clay
| ITF M15 Warmbad-Villach | 2023/05/21 10:00 | Jakub Ostajewski v Jimmy Yang | 4-6,5-7 |
| ITF M15 Warmbad-Villach | 2023/05/21 07:00 | Jakub Ostajewski v Zan M Mihovec | 6-0,6-0 |
| UTR Pro Thessaloniki | 2023/04/29 05:00 | Jakub Ostajewski v Besir Durguti | 1-6,4-6 |
| UTR Pro Thessaloniki | 2023/04/28 08:00 | Jakub Ostajewski v Enrique Bogo | 6-2,1-6,3-6 |
| UTR Pro Thessaloniki | 2023/04/26 05:00 | Jakub Ostajewski v Christos Antonopoulos | 2-6,0-6 |
| UTR Pro Thessaloniki | 2023/04/25 09:08 | Jakub Ostajewski v Vladimir Filip | 2-6,1-6 |
| UTR Pro Thessaloniki | 2023/04/24 05:00 | Mihai Razvan Marinescu v Jakub Ostajewski | 6-3,5-0 |
| UTR Pro Florida | 2023/04/02 13:00 | Azariah Rusher v Jakub Ostajewski | 3-6,6-7 |
| ITF M15 Addis Ababa Qual | 2023/05/22 09:05 | Marcel Politowicz v Chirag Duhan | 7-6,3-6,5-10 |
| ITF M15 Addis Ababa Qual | 2023/05/21 10:20 | Yash Chaurasia v Marcel Politowicz | 1-6,5-7 |
| ITF M15 Addis Ababa | 2023/05/14 06:00 | Marcel Politowicz v Raffael Schaer | 1-6,2-6 |
| ITF M15 Monastir | 2023/04/23 12:00 | Ye Cong Mo v Marcel Politowicz | 6-2,7-5 |
| ITF M15 Monastir | 2023/04/16 08:00 | Chen-Yu Lu v Marcel Politowicz | 6-3,6-4 |
| ITF M25 Palmanova | 2023/03/20 08:00 | Marcel Politowicz v Breno R Urvaneja | 6-4,6-4 |
| ITF M25 Palmanova | 2023/03/13 12:30 | Marcel Politowicz v Aaron Gil Garcia | 5-7,6-3,10-7 |
| ITF M25 Palmanova | 2023/03/12 12:00 | Lazar Markovic v Marcel Politowicz | 5-7,2-6 |