| ITF M15 Forbach | 09/27 11:25 | 25 | Haerteis, Johannes v Mikail Alimli | Retired | |
| ITF M25 Madrid | 09/14 07:55 | 26 | Haerteis, Johannes v Daniel Merida | 3-6,3-6 | |
| ITF M25 Madrid | 09/13 11:00 | 25 | Haerteis, Johannes v Jody Maginley | 6-4,7-5 | |
| Challenger Cassis | 09/03 10:40 | 14 | [359] Charles Broom v Haerteis, Johannes [462] | 6-3,7-6 | |
| ITF M15 Allershausen | 08/31 14:55 | 26 | Haerteis, Johannes v Nicola Kuhn | 5-7,3-6 | |
| ITF M15 Allershausen | 08/30 15:10 | 25 | Haerteis, Johannes v Luca Hesselmann | 2-6,6-1,6-4 | |
| ITF M25 Ystad | 08/16 08:45 | 25 | Valentin Vacherot v Haerteis, Johannes | 6-2,6-7,6-4 | |
| ITF M15 Frankfurt Am Main | 08/11 12:50 | 27 | Lucas Gerch v Haerteis, Johannes | 7-5,6-0 | |
| ITF M15 Frankfurt Am Main | 08/10 10:55 | 26 | Kai Lemstra v Haerteis, Johannes | 7-5,4-6,2-6 | |
| ITF M15 Frankfurt Am Main | 08/08 09:00 | 25 | Haerteis, Johannes v Mats Rosenkranz | Retired | |
| Challenger Porto | 08/01 16:10 | 25 | Haerteis, Johannes v Emilio Nava | 6-7,6-7 | |
| Challenger Porto | 07/31 10:00 | 19 | Maia, Hugo v Haerteis, Johannes | 5-7,5-7 | |
| Challenger Porto | 07/30 10:00 | 14 | Haerteis, Johannes v Victor Lilov | 6-4,2-6,6-2 | |
| ITF M25 Porto | 07/27 11:45 | 26 | Haerteis, Johannes v Joao Domingues | 6-2,6-7,2-6 | |
| ITF M25 Porto | 07/26 11:35 | 25 | Pinho, Tomas v Haerteis, Johannes | 4-6,6-7 | |
| ITF M15 Cluj Napoca | 06/22 06:50 | 27 | Haerteis, Johannes v Gabi Adrian Boitan | 2-6,3-6 | |
| ITF M15 Cluj Napoca | 06/21 09:10 | 26 | Dan Alexandru Tomescu v Haerteis, Johannes | 4-6,2-6 | |
| ITF M15 Cluj Napoca | 06/20 06:25 | 25 | Haerteis, Johannes v Mihai Alexandru Coman | 6-4,7-6 | |
| ITF M15 Vaasa | 06/07 12:45 | 25 | Haerteis, Johannes v Vasa, Iiro | 4-6,1-6 | |
| Challenger Prague Qual | 05/07 12:55 | 14 | [268] Vitaliy Sachko v Haerteis, Johannes [386] | 5-7,6-2,6-1 | |
| ITF M25 Sanxenxo | 04/28 13:00 | 27 | [450] Robert Strombachs v Haerteis, Johannes [386] | 7-6,6-4 | |
| ITF M25 Sanxenxo | 04/27 12:30 | 26 | Haerteis, Johannes v Tao Mu | 6-4,6-1 | |
| ITF M25 Sanxenxo | 04/26 10:00 | 25 | Haerteis, Johannes v Grigory Kuklin | 6-1,6-0 | |
| ITF - M15 Antalya | 04/21 07:30 | 27 | Madaras, Dragos Nicolae v Haerteis, Johannes | 6-2,6-2 | |
| ITF - M15 Antalya | 04/20 07:00 | 26 | Dan Alexandru Tomescu v Haerteis, Johannes | 1-6,6-4,2-6 | |
| ITF - M15 Antalya | 04/18 09:50 | 25 | [390] Haerteis, Johannes v Arthur Reymond [450] | 6-4,6-2 | |
| ITF - M15 Antalya | 04/12 07:00 | 25 | Capecchi, Daniele v Haerteis, Johannes | 4-6,6-3,6-2 | |
| ITF - M25 Trente | 03/30 15:00 | 26 | [395] Giovanni Oradini v Haerteis, Johannes [442] | 6-4,6-0 | |
| ITF - M25 Trente | 03/29 07:30 | 25 | Aleksandr Bulitski v Haerteis, Johannes | 2-6,2-6 | |
| Challenger Biel | 03/19 15:05 | 14 | [402] Forti, Francesco v Haerteis, Johannes [440] | 4-6,6-4,7-5 |