| Challenger Barletta | 04/08 08:00 | 166 | Johannes Haerteis v Marco Bortolotti | 4-6,6-1,6-4 | |
| Challenger Santiago | 03/05 15:40 | 25 | [382] Johannes Haerteis v Pedro Martinez [162] | 1-6,4-6 | |
| Challenger Santiago | 03/04 15:30 | 24 | [382] Johannes Haerteis v Sumit Nagal [351] | 6-4,0-6,6-3 | |
| Challenger Morelos | 02/19 16:00 | 24 | [343] Alejandro Gonzalez v Johannes Haerteis [381] | 6-3,6-1 | |
| ITF M25 Barnstaple | 02/12 10:00 | 25 | Jack Draper v Johannes Haerteis | 7-6,6-3 | |
| Challenger Koblenz | 01/15 12:45 | 25 | [217] Filip Horansky v Johannes Haerteis [388] | 7-6,6-4 | |
| Challenger Koblenz | 01/14 15:40 | 24 | [388] Johannes Haerteis v Vaclav Safranek [295] | 7-6,4-6,6-3 | |
| Challenger Bratislava | 11/06 15:15 | 25 | [491] Johannes Haerteis v Lukas Rosol [164] | 3-6,3-6 | |
| Challenger Bratislava | 11/05 10:00 | 54 | [491] Johannes Haerteis v Ante Pavic [325] | 4-6,7-5,7-6 | |
| Challenger Bratislava | 11/04 12:20 | 46 | [271] Matteo Viola v Johannes Haerteis [490] | 3-6,6-7 | |
| Challenger Bratislava | 11/03 15:15 | 45 | [499] Thomas Statzberger v Johannes Haerteis [490] | 4-6,4-6 | |
| Challenger Eckental | 10/28 13:45 | 46 | [409] Albano Olivetti v Johannes Haerteis [492] | 6-3,6-4 | |
| Challenger Eckental | 10/27 14:00 | 45 | Johannes Haerteis v Tim Hofmann | 6-3,6-1 | |
| Challenger Ismaning | 10/20 15:05 | 28 | [448] Johannes Haerteis v Gleb Sakharov [255] | 4-6,2-6 | |
| Challenger Ismaning | 10/19 16:40 | 27 | [285] Daniel Masur v Johannes Haerteis [448] | 5-7,3-6 | |
| Challenger Ismaning | 10/18 12:00 | 26 | [489] Lukas Klein v Johannes Haerteis [448] | 3-6,6-4,5-7 | |
| Challenger Ismaning | 10/17 14:25 | 25 | [448] Johannes Haerteis v Dennis Novak [137] | 0-6,7-6,7-5 | |
| Challenger Ismaning | 10/15 10:30 | 54 | [189] Szymon Walkow v Johannes Haerteis [448] | 4-6,4-6 | |
| Challenger Ismaning | 10/14 10:20 | 46 | [312] Marek Gengel v Johannes Haerteis [479] | 2-6,2-6 | |
| Challenger Ismaning | 10/13 11:35 | 45 | [479] Johannes Haerteis v Manuel Guinard [373] | 7-6,6-2 | |
| ITF Sweden F5 | 10/05 14:30 | 28 | Emil Ruusuvuori v Johannes Haerteis | 6-4,7-5 | |
| ITF Sweden F5 | 10/04 12:00 | 27 | Johannes Haerteis v George Botezan | 6-4,6-4 | |
| ITF Sweden F5 | 10/03 12:00 | 26 | Lucas Catarina v Johannes Haerteis | 5-7,2-6 | |
| ITF Sweden F5 | 10/02 12:00 | 25 | Johannes Haerteis v Antoine Bellier | 6-4,6-2 | |
| ITF Sweden F4 | 09/27 11:00 | 27 | Christopher Heyman v Johannes Haerteis | 6-3,4-6,6-4 | |
| ITF Sweden F4 | 09/26 11:00 | 26 | Otto Virtanen v Johannes Haerteis | Retired | |
| ITF Sweden F4 | 09/24 11:00 | 25 | Johannes Haerteis v Fred Simonsson | 6-3,6-2 | |
| Challenger Sibiu | 09/16 10:35 | 46 | [457] Johannes Haerteis v Julian Lenz [491] | 4-6,4-6 | |
| Challenger Sibiu | 09/15 07:30 | 45 | Vit Kopriva v Johannes Haerteis | 4-6,1-6 | |
| ITF Romania F13 | 09/13 06:30 | 26 | Johannes Haerteis v Gabriel Alejandro Hidalgo | 4-6,5-7 |