Stadium: Court 4 Round: 25 Ground: Clay
| ITF M15 Frankfurt Am Main | 2023/08/09 13:00 | Jakob Schnaitter v Marcel Zielinski | 6-7,6-2,6-2 |
| ITF M15 Eindhoven | 2023/08/03 11:20 | Elmer Moller v Marcel Zielinski | 6-3,6-1 |
| ITF M15 Eindhoven | 2023/08/01 15:20 | Alexis Boureau v Marcel Zielinski | 1-6,1-6 |
| ITF M25 Esch/Alzette | 2023/07/13 14:30 | Marcel Zielinski v Brian Bozemoj | 6-2,6-4 |
| ITF M25 Esch/Alzette | 2023/07/12 11:35 | Marcel Zielinski v Boris Fassbender | 6-3,6-1 |
| ITF M15 Sofia | 2023/07/06 08:10 | Matej Dodig v Marcel Zielinski | 6-4,6-2 |
| ITF M15 Sofia | 2023/07/05 09:45 | Alessandro Ingarao v Marcel Zielinski | 0-6,3-6 |
| ITF M15 Kamen | 2023/06/28 10:50 | Matyas Cerny v Marcel Zielinski | 6-4,6-4 |
| ITF M25 Koksijde | 2023/08/15 12:15 | Lautaro Agustin Falabella v Buvaysar Gadamauri | 0-6,1-6 |
| ITF M15 Doboj | 2023/05/12 08:35 | Lautaro Agustin Falabella v Stefan Popovic | 6-3,0-6,0-6 |
| ITF M15 Doboj | 2023/05/10 08:00 | Nikola Basic v Lautaro Agustin Falabella | 3-6,6-4,5-7 |
| ITF M15 Doboj | 2023/05/09 08:00 | Lautaro Agustin Falabella v Luka Miklavcic | 2-6,6-3,10-6 |
| ITF M15 Doboj | 2023/05/08 08:00 | Lautaro Agustin Falabella v Luka Puljic | 6-0,6-4 |
| ITF M15 Osijek | 2023/05/04 10:55 | Lautaro Agustin Falabella v Gergely Madarasz | 4-6,6-7 |
| ITF M15 Osijek | 2023/05/03 10:05 | Lautaro Agustin Falabella v Nikola Basic | 6-1,7-6 |
| ITF M15 Mogi das Cruzes | 2023/04/25 15:30 | Lautaro Agustin Falabella v Felipe De Dios | 7-5,4-6,0-6 |