| ITF - M25 Trimbach | 03/15 11:30 | 25 | [440] Haerteis, Johannes v Marcello Serafini [376] | 4-6,7-5,4-6 | |
| ITF - M15 Oberhaching | 02/15 12:25 | 25 | [355] Veldheer, Mick v Haerteis, Johannes [464] | 3-6,6-4,6-4 | |
| ITF M25 Bath | 02/07 12:10 | 25 | George Loffhagen v Haerteis, Johannes | 6-3,6-3 | |
| Challenger - Koblenz | 01/31 17:35 | 25 | Alexey Vatutin v Haerteis, Johannes | 7-6,6-1 | |
| Challenger - Koblenz | 01/30 10:00 | 19 | Jahn, Jeremy v Haerteis, Johannes | 4-6,4-6 | |
| Challenger - Koblenz | 01/29 13:45 | 14 | Haerteis, Johannes v Arnaboldi, Andrea | 6-4,6-4 | |
| ITF - M25 Nussloch | 01/25 11:50 | 25 | Haerteis, Johannes v Elmar Ejupovic | 5-7,6-7 | |
| Drummondville, Canada | 11/14 18:50 | 19 | Lapadat, Joshua v Haerteis, Johannes | Retired | |
| Drummondville, Canada | 11/13 21:25 | 14 | King, Evan v Haerteis, Johannes | 7-6,2-6,2-6 | |
| Challenger Calgary | 11/08 23:55 | 25 | Haerteis, Johannes v Gabriel Decamps | 5-7,4-6 | |
| Challenger Calgary | 11/07 18:50 | 19 | Alafia Ayeni v Haerteis, Johannes | 4-6,3-6 | |
| Challenger Calgary | 11/07 00:15 | 14 | Florig, Philip v Haerteis, Johannes | 3-6,2-6 | |
| ITF M15 Forbach | 09/29 08:30 | 26 | Max Hans Rehberg v Haerteis, Johannes | 7-6,6-2 | |
| ITF M15 Forbach | 09/27 08:00 | 25 | Valentin Faure v Haerteis, Johannes | 2-6,1-6 | |
| ITF M15 Danderyd | 09/23 10:25 | 27 | Haerteis, Johannes v Vito Tonejc | 4-6,7-6,4-6 | |
| ITF M15 Danderyd | 09/22 09:35 | 26 | Haerteis, Johannes v Mikula, Michal | 6-7,6-2,7-5 | |
| ITF M15 Danderyd | 09/20 12:10 | 25 | Haerteis, Johannes v Arvid Nordquist | 6-3,6-3 | |
| ITF M25 Roehampton | 08/23 09:00 | 25 | Haerteis, Johannes v Giles Hussey | 4-6,2-6 | |
| ITF M25 Aldershot | 08/17 09:00 | 25 | Basing, Max v Haerteis, Johannes | 6-1,6-0 | |
| ITF M15 Metzingen | 07/22 15:45 | 27 | Haerteis, Johannes v Sander Jong | 3-6,7-6,6-7 | |
| ITF M15 Metzingen | 07/21 11:00 | 26 | Haerteis, Johannes v Karl Friberg | 6-4,1-6,6-3 | |
| ITF M15 Metzingen | 07/20 11:00 | 25 | Haerteis, Johannes v Liam Gavrielides | 6-4,5-7,7-6 | |
| ITF M25 Marburg | 07/06 12:20 | 25 | Haerteis, Johannes v Max Wiskandt | 4-6,7-6,1-6 | |
| Challenger Malaga | 06/27 08:30 | 19 | [331] Gabriel Decamps v Haerteis, Johannes [439] | 6-4,6-1 | |
| Challenger Malaga | 06/26 08:30 | 14 | Marrero Santana, David v Haerteis, Johannes | 2-6,6-4,1-6 | |
| ITF M25 Martos | 06/16 15:30 | 26 | [443] Haerteis, Johannes v Alberto Barroso Campos [281] | 2-6,6-3,2-6 | |
| ITF M25 Martos | 06/15 17:05 | 25 | Haerteis, Johannes v Aaron Cohen | 6-4,6-4 | |
| ITF M15 Cordoba | 06/08 18:40 | 25 | Svyatoslav Gulin v Haerteis, Johannes | 6-4,6-2 | |
| Challenger - Tunis | 05/15 09:30 | 14 | [400] Shintaro Mochizuki v Haerteis, Johannes [432] | 7-5,3-6,6-1 | |
| Challenger Heilbronn | 05/09 11:35 | 19 | [432] Haerteis, Johannes v Henri Squire [353] | Retired |