| ITF Hungary F1 | 04/19 12:00 | 25 | Maciej Rajski v Johannes Haerteis | 1-6,4-6 | |
| ITF Italy F3 | 03/17 14:00 | 27 | Johannes Haerteis v Alessandro Bega | 2-6,4-6 | |
| ITF Italy F3 | 03/16 11:00 | 26 | Filip Veger v Johannes Haerteis | 1-6,4-6 | |
| ITF Italy F3 | 03/14 18:30 | 25 | Filippo Schena v Johannes Haerteis | 3-6,1-6 | |
| ITF Italy F2 | 03/09 12:35 | 26 | Jan Hernych v Johannes Haerteis | 6-3,6-2 | |
| ITF Italy F2 | 03/07 13:20 | 25 | Enrico Dalla Valle v Johannes Haerteis | 3-6,3-6 | |
| ITF Italy F1 | 03/03 14:45 | 26 | Johannes Haerteis v Gregoire Jacq | 2-6,3-6 | |
| ITF Italy F1 | 03/01 15:50 | 25 | Riccardo Bellotti v Johannes Haerteis | 3-6,7-5,1-6 | |
| ITF Switzerland F2 | 02/16 12:30 | 25 | Johannes Haerteis v Yann Marti | 2-6,2-6 | |
| ITF Switzerland F2 Qual | 02/14 14:05 | 44 | Johannes Haerteis v Marc-Andrea Huesler | 6-1,6-2 | |
| ITF Switzerland F1 Qual | 02/07 15:30 | 62 | Johannes Haerteis v Loic Perret | 6-4,1-6,6-7 | |
| ITF Switzerland F1 Qual | 02/07 10:00 | 62 | Johannes Haerteis v Marco Di Maro | 6-3,6-2 | |
| ITF Germany F3 | 01/29 12:05 | 27 | Uladzimir Ignatik v Johannes Haerteis | 7-5,7-5 | |
| ITF Germany F3 | 01/28 11:30 | 26 | Johannes Haerteis v Alessandro Giannessi | 6-2,6-3 | |
| ITF Germany F3 | 01/27 10:05 | 25 | Alexander Bublik v Johannes Haerteis | 5-7,1-6 | |
| ITF Germany F3 Qual | 01/25 18:15 | 44 | Mate Pavic v Johannes Haerteis | 3-6,6-2,2-6 | |
| ITF Germany F2 | 01/22 12:00 | 27 | Filip Veger v Johannes Haerteis | 6-4,6-4 | |
| ITF Germany F2 | 01/21 12:00 | 26 | Johannes Haerteis v Tobias Simon | 3-6,6-3,7-6 | |
| ITF Germany F1 | 01/14 13:30 | 26 | Johannes Haerteis v Dominik Boehler | 6-1,6-7,2-6 | |
| ITF Germany F1 | 01/13 12:25 | 25 | Florian Fallert v Johannes Haerteis | 4-6,4-6 | |
| ITF Germany F17 | 10/21 15:50 | 25 | Jeremy Jahn v Johannes Haerteis | 6-1,7-6 | |
| ITF Germany F16 | 10/15 15:15 | 26 | Oscar Otte v Johannes Haerteis | 6-3,6-1 | |
| ITF Germany F16 | 10/13 10:40 | 25 | David Poljak v Johannes Haerteis | 4-6,1-6 | |
| ITF Germany F15 | 10/08 13:05 | 26 | Johannes Haerteis v Jan Choinski | 7-6,1-6,2-6 | |
| ITF Germany F15 | 10/07 09:25 | 25 | Louis Wessels v Johannes Haerteis | 0-6,4-6 | |
| ITF Germany F14 | 10/01 09:00 | 26 | Johannes Haerteis v Martins Podzus | 5-7,6-7 | |
| ITF Germany F13 | 08/26 11:25 | 25 | Tobias Simon v Johannes Haerteis | 4-6,6-4,6-4 | |
| ITF Germany F12 | 08/21 11:00 | 27 | Javier Marti v Johannes Haerteis | 6-2,6-4 | |
| ITF Germany F12 | 08/20 14:35 | 26 | Jakob Sude v Johannes Haerteis | 6-7,7-6,2-6 | |
| ITF Germany F12 | 08/18 11:00 | 25 | Laslo Urrutia Fuentes v Johannes Haerteis | 3-6,6-1,2-6 |