| ITF Israel F5 | 05/04 07:30 | 28 | Haerteis, Johannes v Matias Franco Descotte | 3-6,2-6 | |
| ITF Israel F5 | 05/03 07:30 | 27 | Uryson, Nicolas v Haerteis, Johannes | 6-7,1-6 | |
| ITF Israel F5 | 05/02 08:30 | 26 | Haerteis, Johannes v Ram-Harel, Or | Walkover | |
| ITF Israel F5 | 05/01 07:00 | 25 | Hasson, Jordan v Haerteis, Johannes | 5-7,4-6 | |
| ITF Israel F4 | 04/25 10:00 | 25 | Haerteis, Johannes v Niklas-Salminen, Patrick | 4-6,7-6,4-6 | |
| ITF Tunisia F13 | 04/05 12:00 | 26 | Haerteis, Johannes v Clement Tabur | 7-6,5-7,5-7 | |
| ITF Tunisia F13 | 04/03 10:30 | 25 | Haerteis, Johannes v Santalla, Ezequiel Agustin | 6-3,4-6,6-2 | |
| ITF Greece F5 | 03/29 07:30 | 26 | Haerteis, Johannes v Crepatte, Baptiste | 4-6,7-6,3-6 | |
| ITF Greece F5 | 03/27 12:00 | 25 | Manda, Calin v Haerteis, Johannes | 2-6,2-6 | |
| ITF Italy F1 Qual | 02/25 09:00 | 54 | Raul Brancaccio v Haerteis, Johannes | Retired | |
| ITF Italy F1 Qual | 02/24 08:30 | 54 | Wolfschmidt, Alexander v Haerteis, Johannes | 0-6,0-6 | |
| ITF Switzerland F2 | 02/14 09:00 | 26 | Lukas Klein v Haerteis, Johannes | 6-4,7-6 | |
| ITF Switzerland F2 | 02/13 11:40 | 25 | Haerteis, Johannes v Hugo Grenier | 4-6,6-3,7-6 | |
| ITF Switzerland F2 Qual | 02/11 10:00 | 54 | Haerteis, Johannes v Fiacan, Stefan | 6-2,6-1 | |
| ITF Switzerland F1 | 02/06 12:00 | 25 | Haerteis, Johannes v Lenz, Julian | 6-2,1-6,4-6 | |
| ITF Switzerland F1 Qual | 02/05 09:00 | 44 | Haerteis, Johannes v Kunz, Giordan | 6-3,6-3 | |
| ITF Egypt F2 | 01/24 09:40 | 25 | Haerteis, Johannes v Hossam, Youssef | 6-7,4-6 | |
| ITF Egypt F2 | 01/22 08:00 | 62 | Pierre, Hugo v Haerteis, Johannes | 6-7,1-6 | |
| ITF Egypt F2 | 01/21 10:00 | 62 | Kaza, Vinayak Sharma v Haerteis, Johannes | 3-6,2-6 | |
| ITF Egypt F2 | 01/20 08:00 | 62 | van Buuren, Ilco v Haerteis, Johannes | 3-6,2-6 | |
| ITF Egypt F1 | 01/15 10:00 | 62 | Haerteis, Johannes v Fabian Marozsan | 2-6,4-6 | |
| ITF Egypt F1 | 01/14 08:00 | 62 | Haerteis, Johannes v Jannik Sinner | 6-3,5-7,7-5 | |
| Challenger Eckental Qual | 10/28 09:00 | 45 | Evan Furness v Haerteis, Johannes | 3-6,7-6,7-6 | |
| ITF Czech Republic F7 | 10/25 08:00 | 25 | Kalenichenko, Danylo v Haerteis, Johannes | 6-4,6-2 | |
| ITF Germany F15 | 10/16 10:00 | 44 | Haerteis, Johannes v Herzgerodt, Ingo | 6-4,6-3 | |
| ITF Germany F15 | 10/16 10:00 | 44 | Haerteis, Johannes v Carter, Robert | 7-6,1-6,0-6 | |
| ITF Germany F14 | 10/11 16:00 | 25 | Daniel Masur v Haerteis, Johannes | 7-6,6-3 | |
| ITF Germany F14 | 10/09 10:00 | 44 | Haerteis, Johannes v Lemstra, Sven | 6-3,6-1 | |
| ITF Germany F14 | 10/08 11:30 | 44 | Haerteis, Johannes v Cadonau, Jakob | 6-1,6-2 | |
| ITF France F21 | 09/26 10:15 | 25 | Haerteis, Johannes v Schott, Hugo | Retired |