Stadium: Court 3 Round: 25 Ground: Carpet indoor
| ITF M25 Nussloch | 2020/01/20 18:15 | Mattia Bellucci v Jakob Aichhorn | 3-6,4-6 |
| ITF M25 Nussloch | 2020/01/20 12:10 | Torben Steinorth v Jakob Aichhorn | 2-6,5-7 |
| ITF M25 Nussloch | 2020/01/19 09:00 | Moritz Hoffmann v Jakob Aichhorn | 7-5,3-6,8-10 |
| ITF M15 Milovice | 2019/11/14 09:00 | Jakob Aichhorn v Andrew Paulson | 0-6,2-6 |
| ITF M15 Milovice | 2019/11/12 12:25 | Daniel Siniakov v Jakob Aichhorn | 6-7,0-6 |
| ITF M15 Prague | 2019/11/05 10:10 | Marek Gengel v Jakob Aichhorn | 7-5,5-7,10-8 |
| ITF M15 Liberec | 2019/10/23 12:50 | Jakob Aichhorn v Michal Konecny | 0-6,4-6 |
| ITF M15 Olomouc | 2019/10/17 14:00 | Vit Kopriva v Jakob Aichhorn | 7-5,6-3 |
| ITF M15 Manacor | 2020/01/15 12:35 | Johannes Haerteis v Pablo Llamas Ruiz | 3-6,4-6 |
| ITF M15 Prague | 2019/11/06 14:40 | Oleksii Krutykh v Johannes Haerteis | 4-6,7-6,6-2 |
| Challenger Eckental | 2019/10/29 09:00 | John-Patrick Smith v Johannes Haerteis | 7-6,6-7,7-6 |
| Challenger Hamburg | 2019/10/22 08:00 | Cem Ilkel v Johannes Haerteis | 7-5,6-1 |
| Challenger Ismaning | 2019/10/17 11:00 | Zdenek Kolar v Johannes Haerteis | 6-7,6-7 |
| Challenger Ismaning | 2019/10/16 11:50 | Johannes Haerteis v Robin Haase | 6-4,6-7,7-6 |
| Challenger Ismaning | 2019/10/14 15:10 | Johannes Haerteis v Maximilian Neuchrist | 6-4,6-4 |
| Challenger Nur-Sultan 2 | 2019/10/01 04:00 | Fabien Reboul v Johannes Haerteis | 6-4,6-7,6-3 |