Ground: Clay
| ITF M15 Heraklion | 2025/04/02 10:29 | Jonas P Hartenstein v Alexis Canter | 2-6,7-6,6-7 |
| ITF M15 Heraklion | 2025/03/26 12:58 | Marcus Walters v Jonas P Hartenstein | 7-6,6-3 |
| ITF M25 Trimbach | 2025/03/05 15:17 | Jonas P Hartenstein v Mats Rosenkranz | 2-6,5-7 |
| ITF M25 Trimbach | 2025/03/04 12:00 | Francois Musitelli v Jonas P Hartenstein | 4-6,6-3,0-1 |
| ITF M25 Trimbach | 2025/03/03 16:04 | Joe Tyler v Jonas P Hartenstein | 6-7,2-6 |
| ITF M15 Heraklion | 2024/11/19 07:30 | Filippo Francesco Garbero v Jonas P Hartenstein | 6-1,6-3 |
| ITF M15 Heraklion | 2024/11/18 09:30 | Nazar Oliynykov v Jonas P Hartenstein | 7-5,2-6,7-10 |
| ITF M15 Heraklion | 2024/11/14 09:00 | Jonas P Hartenstein v Adria Soriano Barrera | 4-6,1-6 |
| ITF M25 Varnamo | 2024/05/07 11:35 | Karl Friberg v Giovanni Calvano | 6-3,4-6,3-6 |
| Davis Cup | 2024/02/02 16:00 | Karl Friberg v Thiago Monteiro | 3-6,6-7 |
| ITF M15 Manacor | 2024/01/27 10:00 | Karl Friberg v Ryan Nijboer | 4-6,2-6 |
| ITF M15 Manacor | 2024/01/26 10:00 | Karl Friberg v Michiel de Krom | 7-6,6-3 |
| ITF M15 Manacor | 2024/01/25 14:30 | Karl Friberg v Kristjan Tamm | 6-1,1-6,6-3 |
| ITF M15 Manacor | 2024/01/24 09:30 | Karl Friberg v Hayato Matsuoka | 7-6,5-7,6-2 |
| Challenger Oeiras Qual | 2024/01/07 17:15 | Karl Friberg v Samuel Vincent Ruggeri | 3-6,2-6 |
| Challenger Maia | 2023/11/29 12:35 | Karl Friberg v Andrea Vavassori | 2-6,3-6 |