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