Stadium: Sportna Dvorana Golovec Round: 26 Ground: Clay
| ITF M15 Sharm El Sheikh | 2023/02/19 15:30 | Sebastian Sorger v Jan Kupcic | 6-4,6-4 |
| ITF M25 Split | 2023/04/19 14:15 | Jan Kupcic v Matic Dimic | 0-6,4-6 |
| ITF M25 Split | 2023/04/18 09:45 | Jan Kupcic v Ivan Kremenchutskyi | 6-4,6-2 |
| ITF M25 Split | 2023/04/17 14:10 | Jan Kupcic v Gabriel Gomez | 6-0,6-2 |
| ITF M25 Split | 2023/04/17 07:00 | Jan Kupcic v Ognjen Pavlovic | 6-1,6-0 |
| ITF M25 Opatija | 2023/03/19 10:30 | Andrea Bolla v Jan Kupcic | 6-3,2-6,10-3 |
| ITF M15 Rovinj | 2023/03/14 11:20 | Pavel Nejedly v Jan Kupcic | 6-3,7-5 |
| ITF M15 Rovinj | 2023/03/13 09:00 | Jan Kupcic v Gabriel Matuszewski | 6-2,4-6,10-8 |
| ITF M15 Rovinj | 2023/03/12 12:00 | Hans Peter Kaufmann v Jan Kupcic | 1-6,6-7 |
| ITF M15 Doboj | 2023/05/14 12:00 | Ergi Kirkin v Sebastian Sorger | 7-6,7-5 |
| ITF M15 Doboj | 2023/05/13 13:00 | Viacheslav Bielinskyi v Sebastian Sorger | 4-6,1-6 |
| ITF M15 Doboj | 2023/05/13 09:00 | Sebastian Sorger v Mirko Martinez | 6-1,7-5 |
| ITF M15 Doboj | 2023/05/12 08:50 | Sebastian Sorger v Lucio Carnevalle | 7-6,6-2 |
| ITF M15 Doboj | 2023/05/09 13:30 | Lorenzo Bocchi v Sebastian Sorger | 5-7,3-6 |
| ITF M15 Osijek | 2023/05/05 14:55 | Sebastian Sorger v Mohamed Safwat | 6-4,3-6,2-6 |
| ITF M15 Osijek | 2023/05/04 09:00 | Lorenzo Bocchi v Sebastian Sorger | 4-6,2-6 |
| ITF M15 Osijek | 2023/05/03 08:00 | Domagoj Biljesko v Sebastian Sorger | 4-6,1-6 |