Stadium: Court 4 Round: 26 Ground: Hardcourt outdoor
| 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 |
| 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 Ueberlingen | 2023/08/18 10:00 | Lasse Poertner v Jakob Schnaitter | 2-6,4-6 |
| ITF M15 Ueberlingen | 2023/08/17 10:50 | Lasse Poertner v Illya Beloborodko | 6-4,3-6,6-3 |
| ITF - M15 Sharm El Sheikh | 2024/03/13 12:45 | Yusuf Khamis v Joshua Sheehy | 3-6,4-6 |
| Challenger Kigali | 2024/03/04 12:30 | Corentin Denolly v Joshua Sheehy | 6-1,6-4 |
| Challenger Kigali | 2024/02/27 09:45 | Nicholas David Ionel v Joshua Sheehy | 6-1,6-2 |
| Challenger - Cleveland | 2024/01/29 15:00 | Matija Pecotic v Joshua Sheehy | 6-2,6-3 |
| Challenger - Cleveland | 2024/01/28 15:00 | Noah Schachter v Joshua Sheehy | 2-6,2-6 |
| ITF M25 - Wesley Chapel | 2024/01/23 18:25 | Joshua Sheehy v Gilles Arnaud Bailly | 2-6,2-6 |
| ITF - M25 Ithaca | 2024/01/19 15:25 | Joshua Sheehy v Karue Sell | 6-2,4-6,3-6 |
| ITF - M25 Ithaca | 2024/01/18 15:20 | Joshua Sheehy v Eric David Verdes | 6-4,6-4 |