| Exo Tennis Germany Series | 05/02 09:50 | 44 | [354] Benjamin Hassan v Haerteis, Johannes [342] | 1-4,4-3,2-4 | |
| Exo Tennis Germany Series | 05/01 11:10 | 44 | [342] Haerteis, Johannes v Jan Choinski [332] | 4-2,4-2 | |
| Exo Tennis Germany Series | 05/01 09:20 | 44 | [143] Yannick Hanfmann v Haerteis, Johannes [342] | 4-0,4-1 | |
| Las Vegas, Singles M-ITF-USA-07A | 03/07 02:30 | 27 | [345] Haerteis, Johannes v Petros Chrysochos [476] | 2-6,7-5,4-6 | |
| Las Vegas, Singles M-ITF-USA-07A | 03/05 19:45 | 26 | Haerteis, Johannes v Blumenberg, Alex | 7-6,6-1 | |
| Las Vegas, Singles M-ITF-USA-07A | 03/04 19:15 | 25 | Haerteis, Johannes v Shane, Ryan | 6-4,6-4 | |
| Challenger Columbus | 02/27 19:50 | 26 | [360] Haerteis, Johannes v Stebe, Cedrik-Marcel [138] | 4-6,1-6 | |
| Challenger Columbus | 02/26 19:30 | 25 | [203] Juan Pablo Ficovich v Haerteis, Johannes [360] | 2-6,6-7 | |
| Challenger Columbus | 02/25 15:00 | 24 | Alexander Brown v Haerteis, Johannes | 3-6,6-7 | |
| Drummondville, Canada | 02/22 17:00 | 28 | [252] Maxime Cressy v Haerteis, Johannes [429] | 7-6,6-4 | |
| Drummondville, Canada | 02/21 17:40 | 27 | [222] Roberto Cid Subervi v Haerteis, Johannes [429] | 6-1,4-6,1-6 | |
| Drummondville, Canada | 02/20 17:45 | 26 | [429] Haerteis, Johannes v Niklas-Salminen, Patrick [464] | 7-6,5-7,7-5 | |
| Drummondville, Canada | 02/18 23:05 | 25 | [278] Goncalo Oliveira v Haerteis, Johannes [429] | 6-7,1-6 | |
| Drummondville, Canada | 02/17 17:55 | - | Haerteis, Johannes v Heliovaara, Harri | Cancelled | |
| Drummondville, Canada | 02/17 17:45 | 24 | Haerteis, Johannes v Bourcet, Tony | 6-2,6-0 | |
| ITF - M25 Nussloch | 01/24 19:00 | 27 | [431] Haerteis, Johannes v Bemelmans, Ruben [260] | 4-6,3-6 | |
| ITF - M25 Nussloch | 01/23 10:55 | 26 | [380] Giulio Zeppieri v Haerteis, Johannes [431] | 6-3,3-6,6-7 | |
| ITF - M25 Nussloch | 01/22 12:50 | 25 | Aichhorn, Jakob v Haerteis, Johannes | 2-6,6-4,4-6 | |
| ITF - M15 Manacor | 01/15 12:35 | 25 | Haerteis, Johannes v Pablo Llamas Ruiz | 3-6,4-6 | |
| Helsinki, Finland | 11/12 11:00 | 24 | [291] Smith, John-Patrick v Haerteis, Johannes [445] | Cancelled | |
| ITF M15 Prague | 11/06 14:40 | 25 | Oleksii Krutykh v Haerteis, Johannes | 4-6,7-6,6-2 | |
| Challenger Eckental | 10/29 09:00 | 24 | [304] Smith, John-Patrick v Haerteis, Johannes [431] | 7-6,6-7,7-6 | |
| Challenger - Hambourg | 10/22 08:00 | 24 | [275] Cem Ilkel v Haerteis, Johannes [430] | 7-5,6-1 | |
| Challenger Ismaning | 10/18 16:35 | 27 | [259] Lenz, Julian v Haerteis, Johannes [392] | Retired | |
| Challenger Ismaning | 10/17 11:00 | 26 | [277] Zdenek Kolar v Haerteis, Johannes [392] | 6-7,6-7 | |
| Challenger Ismaning | 10/16 11:50 | 25 | [392] Haerteis, Johannes v Haase, Robin [151] | 6-4,6-7,7-6 | |
| Challenger Ismaning | 10/14 15:10 | 24 | Haerteis, Johannes v Neuchrist, Maximilian | 6-4,6-4 | |
| Nur-Sultan II, Kazakhstan | 10/01 04:00 | 24 | [176] Reboul, Fabien v Haerteis, Johannes [367] | 6-4,6-7,6-3 | |
| Challenger - Glasgow | 09/18 15:05 | 25 | [368] Haerteis, Johannes v Kamke, Tobias [214] | 3-6,4-6 | |
| Challenger - Glasgow | 09/17 16:10 | 24 | Haerteis, Johannes v Scott Duncan | 6-3,6-3 |