Stadium: Court 1 Round: 45 Ground: Clay
| ITF M15 Bad Waltersdorf | 2023/10/06 10:10 | Marcel Zielinski v David Pichler | 6-4,5-7,6-1 |
| ITF M15 Eindhoven | 2022/08/18 11:00 | David Pichler v Marcel Zielinski | 6-4,6-1 |
| ITF M15 Kamen | 2022/06/21 14:00 | Marcel Zielinski v David Pichler | 3-6,6-7 |
| Challenger Salzburg | 2024/07/09 12:55 | David Pichler v Timofey Skatov | 6-7,1-6 |
| Challenger Salzburg | 2024/07/08 13:15 | Nico Hipfl v David Pichler | 4-6,4-6 |
| Challenger Salzburg | 2024/07/08 08:00 | Sebastian Sorger v David Pichler | 6-7,6-4,6-7 |
| Challenger Ostrava | 2024/04/23 13:55 | Jaime Faria v David Pichler | 6-1,6-4 |
| Challenger Ostrava | 2024/04/22 12:50 | Daniel Michalski v David Pichler | 1-6,4-6 |
| Challenger Ostrava | 2024/04/22 08:30 | David Pichler v Frederico Ferreira Silva | 6-4,6-4 |
| ITF M15 Dubrovnik | 2024/04/18 09:00 | David Pichler v Pietro Marino | 4-6,6-2,4-6 |
| ITF M15 Dubrovnik | 2024/04/16 08:45 | David Pichler v Gabriele Vulpitta | 6-3,6-1 |
| ITF M15 Sofia | 2024/08/14 06:30 | Fernando Cavallo v Marcel Zielinski | 6-4,7-5 |
| ITF M15 Amstelveen | 2024/07/03 15:15 | John Sperle v Marcel Zielinski | 6-2,6-1 |
| ITF M15 Kamen | 2024/06/27 11:35 | Marcel Zielinski v Tom Gentzsch | 1-6,6-4,3-6 |
| ITF M15 Kamen | 2024/06/26 14:20 | Marcel Zielinski v Evan Furness | 6-1,6-3 |
| Challenger Poznan | 2024/06/16 12:55 | Mircea-Alexandru Jecan v Marcel Zielinski | 6-4,3-6,6-3 |
| ITF M15 Koszalin | 2024/06/13 11:30 | Marcel Zielinski v Patrick Zahraj | 5-7,0-6 |
| ITF M15 Koszalin | 2024/06/12 13:10 | Yurii Dzhavakian v Marcel Zielinski | 4-6,3-6 |
| ITF M15 Grodzisk Mazowiecki | 2024/06/05 11:50 | Piotr Siekanowicz v Marcel Zielinski | 6-4,5-7,6-3 |