Stadium: Court 22 Round: 25 Ground: Clay
| ITF M15 Lambermont | 2022/08/27 11:00 | Slump, Stijn v Zielinski, Marcel | 7-6,6-3 |
| ITF M15 Eindhoven | 2022/08/16 12:05 | Slump, Stijn v Zielinski, Marcel | 6-7,4-6 |
| Telde, Singles M-ITF-ESP-31A | 2024/04/11 12:35 | Bonsach Ganley, Kane v Zielinski, Marcel | 7-6,7-6 |
| Telde, Singles M-ITF-ESP-31A | 2024/04/10 14:35 | 피에트리, 벤자민 v Zielinski, Marcel | 4-6,1-6 |
| ITF M15 Antalya | 2024/03/28 07:00 | Zielinski, Marcel v 바르나트, 지리 | 2-6,0-6 |
| ITF M15 Antalya | 2024/03/27 08:50 | Zielinski, Marcel v 스펠레, 존 | 7-5,6-4 |
| ITF M15 Antalya | 2024/03/21 07:00 | Zielinski, Marcel v Ioan Alexandru Chirita | 6-7,1-6 |
| ITF M15 Antalya | 2024/03/13 07:00 | Zielinski, Marcel v Garcia Mestre, Jordi | 4-6,1-6 |
| ITF M25 Hammamet | 2024/02/14 13:30 | Bagnolini, Daniel v Zielinski, Marcel | 6-4,6-3 |
| ITF M25 Hammamet | 2024/02/06 13:50 | 구티에레즈, 오스칼 조세 v Zielinski, Marcel | 6-3,6-0 |
| ITF M15 Antalya | 2024/04/17 08:35 | Kokoro Isomura v Slump, Stijn | 3-6,6-4,6-0 |
| ITF M15 Antalya | 2024/03/30 07:30 | Nicolai Budkov Kjaer v Slump, Stijn | 6-3,6-0 |
| ITF M15 Antalya | 2024/03/29 08:30 | Slump, Stijn v Atakan Karahan | 7-6,6-2 |
| ITF M15 Antalya | 2024/03/28 09:10 | 단쿠, 블라드 안드레이 v Slump, Stijn | 6-3,3-6,4-6 |
| ITF M15 Antalya | 2024/03/27 14:25 | Slump, Stijn v 슬블리아크, 고라즈드 | 6-7,6-3,6-1 |
| ITF M15 Antalya | 2024/03/26 09:00 | Slump, Stijn v Ioan Alexandru Chirita | 6-2,6-0 |
| ITF M15 Antalya | 2024/03/25 06:55 | Slump, Stijn v Sergio Badini | 6-3,6-2 |
| ITF M15 Antalya | 2024/03/24 07:00 | Slump, Stijn v Hopp, Michel | 6-7,6-4,10-8 |