| Challenger Ismaning | 10/24 12:35 | 26 | [431] Haerteis, Johannes v Tristan Lamasine [272] | 6-4,6-4 | |
| ITF M25 Hamburg | 10/23 10:00 | 28 | Henri Squire v Haerteis, Johannes | 6-4,6-4 | |
| ITF M25 Hamburg | 10/22 12:10 | 27 | Haerteis, Johannes v Daniel Little | 6-4,6-4 | |
| ITF M25 Hamburg | 10/21 15:45 | 26 | Haerteis, Johannes v von Hindte, Leonard | 6-3,6-4 | |
| ITF M25 Hamburg | 10/20 10:50 | 25 | Haerteis, Johannes v Balzerani, Riccardo | 6-3,6-4 | |
| ITF M25 Jonkoping | 09/20 10:45 | 25 | [397] Bergevi, Filip v Haerteis, Johannes [363] | 6-4,7-6 | |
| ITF M25 Plaisir | 09/15 11:45 | 25 | Haerteis, Johannes v Mitjana, Leny | 4-6,6-7 | |
| Challenger Tulln | 09/06 13:00 | 25 | [367] Haerteis, Johannes v Horansky, Filip [195] | 6-4,4-6,3-6 | |
| Challenger Mallorca | 09/01 18:40 | 25 | [367] Haerteis, Johannes v Lacko, Lukas [197] | 2-6,3-6 | |
| Challenger Mallorca | 08/31 08:00 | 19 | [349] Nicolas Moreno De Alboran v Haerteis, Johannes [367] | 3-6,6-4,4-6 | |
| Challenger Mallorca | 08/30 08:00 | 14 | [167] Martos Gornes, Sergio v Haerteis, Johannes [367] | 1-6,1-6 | |
| Challenger - Prague | 08/24 10:15 | 25 | [361] Haerteis, Johannes v Alex Rybakov [411] | 4-6,2-6 | |
| Luedenscheid, Germany | 08/15 09:30 | 14 | Bogdan Bobrov v Haerteis, Johannes | 1-6,6-4,6-3 | |
| Challenger Meerbusch | 08/08 16:05 | 14 | Nedelko, Ivan v Haerteis, Johannes | 7-6,6-3 | |
| Segovia, Spain | 07/27 13:05 | 25 | [172] Altug Celikbilek v Haerteis, Johannes [339] | 6-3,6-4 | |
| Challenger Pozoblanco | 07/20 20:10 | 25 | [209] Cem Ilkel v Haerteis, Johannes [334] | 6-2,7-6 | |
| Challenger Amersfoort | 07/13 08:30 | 25 | [225] Moraing, Mats v Haerteis, Johannes [332] | 6-1,6-0 | |
| Braunchsweig, Germany | 07/04 11:55 | 14 | Haerteis, Johannes v Ehrenschneider, Nino | 6-3,3-6,4-6 | |
| Prostejov, Czech Republic | 06/15 08:30 | 25 | [330] Haerteis, Johannes v Federico Coria [103] | 1-6,0-6 | |
| Prostejov, Czech Republic | 06/14 08:30 | 19 | [330] Haerteis, Johannes v David Poljak [461] | 5-7,3-6 | |
| Prostejov, Czech Republic | 06/13 09:00 | 14 | Haerteis, Johannes v Jakub Nicod | 6-3,3-6,6-3 | |
| Challenger Bratislava | 06/06 14:15 | 14 | [384] Skander Mansouri v Haerteis, Johannes [330] | 6-3,7-5 | |
| Challenger - Oeiras | 05/25 14:00 | 25 | [328] Haerteis, Johannes v Filip C Jianu [349] | 3-6,0-6 | |
| ATP - Delray Beach | 01/05 15:00 | 164 | [374] Stefan Kozlov v Haerteis, Johannes [305] | Retired | |
| Challenger Ortisei | 11/19 10:00 | 26 | [311] Haerteis, Johannes v Ilya Ivashka [113] | 6-7,3-6 | |
| Challenger Ortisei | 11/17 09:00 | 25 | [240] Daniel Masur v Haerteis, Johannes [310] | 3-6,7-6,3-6 | |
| Challenger Ortisei | 11/15 10:00 | 19 | [247] Alexey Vatutin v Haerteis, Johannes [310] | 3-6,6-3,3-6 | |
| Challenger Ortisei | 11/14 09:00 | 64 | [310] Haerteis, Johannes v Galovic, Viktor [282] | 4-6,7-6,6-4 | |
| Challenger Bratislava | 11/08 11:00 | - | [329] Haerteis, Johannes v Lenz, Julian [258] | 7-6,4-6,6-7 | |
| Challenger Bratislava | 11/07 15:35 | 64 | [207] Maxime Janvier v Haerteis, Johannes [329] | Retired |