Stadium: Court 2 Oberhaching Round: 26 Ground: Hardcourt indoor
| ITF M15 Oberhaching | 2024/02/13 10:00 | Alen Mujakic v Lasse Poertner | 4-6,1-6 |
| ITF M25 Nussloch | 2024/01/23 18:00 | Vincent Marysko v Lasse Poertner | 6-3,6-4 |
| ITF M15 Cadolzburg | 2024/01/16 11:40 | Lasse Poertner v Stepan Baum | 6-3,4-6,1-6 |
| ITF M15 Doha | 2023/10/09 18:00 | Lasse Poertner v Koray Kirci | 6-3,4-6,2-6 |
| ITF M15 Uberlingen | 2023/08/18 10:00 | Lasse Poertner v Jakob Schnaitter | 2-6,4-6 |
| ITF M15 Uberlingen | 2023/08/17 10:50 | Lasse Poertner v Illya Beloborodko | 6-4,3-6,6-3 |
| ITF M15 Frankfurt Am Main | 2023/08/08 09:00 | Lasse Poertner v Florian Broska | 5-7,1-6 |
| ITF M15 Eindhoven | 2023/08/01 09:55 | Elmer Moller v Lasse Poertner | 6-3,6-0 |
| ITF M15 Oberhaching | 2024/02/13 11:50 | Justin Engel v Tom Gentzsch | 1-6,2-6 |
| Challenger Koblenz | 2024/01/31 11:00 | Tom Gentzsch v Tristan Lamasine | 0-6,2-6 |
| ITF M25 Nussloch | 2024/01/28 12:55 | Daniel Masur v Tom Gentzsch | 6-1,6-3 |
| ITF M25 Nussloch | 2024/01/27 15:10 | Hazem Naw v Tom Gentzsch | 6-7,6-3,3-6 |
| ITF M25 Nussloch | 2024/01/26 13:10 | Tom Gentzsch v Max Hans Rehberg | 6-2,4-6,6-4 |
| ITF M25 Nussloch | 2024/01/25 14:35 | Tom Gentzsch v Adam Heinonen | 6-3,6-4 |
| ITF M25 Nussloch | 2024/01/24 17:30 | Mats Rosenkranz v Tom Gentzsch | 6-7,3-6 |
| ITF M15 Cadolzburg | 2024/01/19 12:00 | Max Hans Rehberg v Tom Gentzsch | 7-6,6-2 |