Stadium: Hortkorn Court Round: 19 Ground: Clay
| Challenger Heilbronn | 2024/06/02 09:30 | Mathias Bourgue v Lasse Poertner | 6-3,3-6,2-6 |
| ITF M15 Kursumlijska Banja | 2024/05/30 10:20 | Gorazd Srbljak v Lasse Poertner | 7-5,6-3 |
| ITF M15 Kursumlijska Banja | 2024/05/28 10:55 | Lasse Poertner v Maxim Zhukov | 2-6,6-4,7-5 |
| ITF M15 Kursumlijska Banja | 2024/05/22 10:15 | Seydina Andre v Lasse Poertner | 6-4,4-6,6-3 |
| ITF M15 Antalya | 2024/04/02 10:50 | Denis Klok v Lasse Poertner | 6-1,6-4 |
| ITF M15 Sharm El Sheikh | 2024/03/14 08:00 | Lasse Poertner v Joshua Sheehy | 2-6,3-6 |
| ITF M15 Sharm El Sheikh | 2024/03/13 14:05 | Illya Beloborodko v Lasse Poertner | 6-4,3-6,2-6 |
| ITF M15 Oberhaching | 2024/02/15 12:05 | Lasse Poertner v Tom Gentzsch | 6-7,4-6 |
| Challenger Heilbronn | 2024/06/02 09:30 | Federico Iannaccone v Louis Wessels | 3-6,3-6 |
| Challenger Bordeaux | 2024/05/13 12:05 | Louis Wessels v Henri Squire | 4-6,2-6 |
| Challenger Mauthausen | 2024/05/06 09:35 | Louis Wessels v Gerald Melzer | 4-6,3-6 |
| Challenger Mauthausen | 2024/05/05 12:45 | Louis Wessels v Manuel Lazic | 6-3,6-2 |
| ITF M25 Santa Margherita | 2024/04/29 10:30 | Louis Wessels v Elmer Moller | 2-6,2-6 |
| ITF M15 Meerbusch | 2024/04/24 10:35 | Louis Wessels v Alec Deckers | 3-6,3-6 |
| ITF M15 Antalya | 2024/04/11 08:45 | Louis Wessels v Stefan Palosi | 4-6,4-6 |
| ITF M15 Antalya | 2024/04/10 09:35 | Louis Wessels v Artur Kukasian | 6-3,6-4 |