Stadium: Court 20 Round: 62 Ground: Clay
| ITF M15 Xativa | 2023/07/31 07:00 | Nil Regas Luis v Jan Kobierski | 6-1,6-1 |
| ITF M15 Xativa | 2023/07/30 15:00 | Jan Kobierski v Axel Herberg Amoros | 7-5,6-1 |
| ITF M15 Kursumlijska Banja | 2023/06/19 07:30 | Milan Drinic v Jan Kobierski | 6-2,7-6 |
| ITF M15 Kursumlijska Banja | 2023/06/18 11:00 | Jan Kobierski v Relja Eskic | 6-2,7-6 |
| ITF M25 Kursumlijska Banja | 2023/06/05 13:50 | Sergei Pogosian v Jan Kobierski | 7-5,6-2 |
| ITF M25 Kursumlijska Banja | 2023/06/04 13:00 | Nikola Mitrovic v Jan Kobierski | 6-4,1-6,8-10 |
| ITF M15 Kursumlijska Banja | 2023/05/30 07:00 | Jan Kobierski v Erik Arutiunian | 0-6,6-1,10-12 |
| ITF M15 Kursumlijska Banja | 2023/05/29 09:05 | Mwendwa Mbithi v Jan Kobierski | 5-7,4-6 |