| Challenger Szczecin | 09/11 14:00 | 25 | [49] Albert Ramos-Vinolas v Haerteis, Johannes [381] | 6-2,6-4 | |
| Challenger Szczecin | 09/09 12:00 | 24 | [381] Haerteis, Johannes v Perchicot, Mathieu [437] | 2-6,6-4,6-2 | |
| L'Aquila, Italie | 08/24 14:55 | 27 | [262] Dmitry Popko v Haerteis, Johannes [412] | 7-6,6-2 | |
| L'Aquila, Italie | 08/22 09:35 | 26 | [363] Juan P Ficovich v Haerteis, Johannes [412] | 3-6,6-7 | |
| L'Aquila, Italie | 08/21 08:00 | 25 | [412] Haerteis, Johannes v Nino Serdarusic [267] | 7-6,6-3 | |
| L'Aquila, Italie | 08/19 09:40 | 24 | [336] Riccardo Bonadio v Haerteis, Johannes [412] | 4-6,4-6 | |
| Challenger Meerbusch | 08/14 12:45 | 25 | [419] Haerteis, Johannes v Benjamin Hassan [293] | Retired | |
| Challenger Meerbusch | 08/13 09:40 | 24 | [419] Haerteis, Johannes v Esteve Lobato, Eduard [374] | 6-4,7-5 | |
| Challenger - Augsburg | 08/06 08:00 | 24 | [417] Haerteis, Johannes v Louis Wessels [356] | 6-7,5-7 | |
| Sopot, Pologne | 07/29 15:15 | 24 | [328] Cuevas, Martin v Haerteis, Johannes [345] | 7-6,6-4 | |
| Hamburg, Germany | 07/20 09:30 | 64 | Davidovich Fokina, Alejandro v Haerteis, Johannes | 6-2,6-3 | |
| Braunchsweig, Germany | 07/10 11:20 | 26 | [363] Haerteis, Johannes v Kamke, Tobias [266] | 5-7,1-6 | |
| Braunchsweig, Germany | 07/09 10:50 | 25 | [147] Rudolf Molleker v Haerteis, Johannes [363] | 6-3,5-7,1-6 | |
| Braunchsweig, Germany | 07/07 14:35 | 24 | Stebe, Cedrik-Marcel v Haerteis, Johannes | 6-3,5-7,4-6 | |
| Ludwigshafen, Allemagne | 07/03 09:00 | 25 | [363] Haerteis, Johannes v Yannick Hanfmann [212] | 3-6,3-6 | |
| Ludwigshafen, Allemagne | 07/02 09:00 | 24 | [363] Haerteis, Johannes v Lenz, Julian [342] | 3-6,7-6,7-6 | |
| Parma II, Italy | 06/17 08:00 | 24 | [359] Haerteis, Johannes v Ehrat, Sandro [396] | Retired | |
| Prostejov, Czech Republic | 06/05 09:00 | 26 | Haerteis, Johannes v Balazs, Attila | Walkover | |
| Prostejov, Czech Republic | 06/03 12:20 | 25 | [181] de Greef, Arthur v Haerteis, Johannes [364] | 4-6,4-6 | |
| Prostejov, Czech Republic | 06/02 14:40 | 24 | [274] Benjamin Lock v Haerteis, Johannes [364] | 6-2,2-6,3-6 | |
| Jerusalem, Israel | 05/20 07:00 | 24 | [363] Haerteis, Johannes v Escobar, Gonzalo [323] | 3-6,7-5,2-6 | |
| Challenger - Rome | 05/07 12:10 | 25 | [372] Haerteis, Johannes v Stefano Napolitano [189] | 2-6,3-6 | |
| Challenger - Rome | 05/06 10:00 | 24 | [465] Skander Mansouri v Haerteis, Johannes [371] | 6-7,7-6,5-7 | |
| Challenger - Savannah | 04/30 14:00 | 24 | Cannon Kingsley v Haerteis, Johannes | 6-2,6-2 | |
| Challenger - Tallahassee | 04/24 14:00 | 25 | [175] Mitchell Krueger v Haerteis, Johannes [375] | 3-6,6-4,6-1 | |
| Challenger - Tallahassee | 04/23 16:40 | 24 | [375] Haerteis, Johannes v Song, Evan [331] | 6-4,6-4 | |
| Challenger - Tallahassee | 04/22 14:00 | 166 | [371] Benjamin Hassan v Haerteis, Johannes [375] | 6-4,6-1 | |
| Challenger - Sarasota | 04/15 14:00 | 166 | [374] Heliovaara, Harri v Haerteis, Johannes [373] | 6-3,6-2 | |
| Challenger - Sarasota | 04/15 14:00 | 166 | Aleksandar Vukic v Haerteis, Johannes | Cancelled | |
| Challenger - Barletta | 04/09 13:55 | 24 | [374] Haerteis, Johannes v Andrea Pellegrino [359] | 4-6,4-6 |