Stadium: Court 5 Round: 44 Ground: Clay
| 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 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 |
| ITF M15 Monastir | 2023/06/19 08:30 | Madhwin Kamath v Marcel Politowicz | 6-2,6-1 |
| ITF M15 Monastir | 2023/06/18 08:30 | Marcel Politowicz v Kyle Rae | 6-4,6-3 |
| ITF M15 Monastir | 2023/06/12 08:30 | William Norton v Marcel Politowicz | 7-5,4-6,12-10 |
| ITF M15 Monastir | 2023/06/11 08:30 | Marcel Politowicz v Ryan A Dos Santos | 6-2,6-3 |
| 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 |