Stadium: Lotto RLP Centre Court Round: 19 Ground: Hardcourt indoor
| ITF Germany F17 | 2015/10/21 15:50 | Jeremy Jahn v Johannes Haerteis | 6-1,7-6 |
| Challenger Koblenz | 2023/01/29 10:20 | Maxime Mora v Jeremy Jahn | 1-6,2-6 |
| ITF M25 Loughborough | 2023/01/12 13:55 | Mirza Basic v Jeremy Jahn | 4-6,6-3,7-5 |
| ITF M25 Loughborough | 2023/01/11 09:55 | Jeremy Jahn v Felix Gill | 7-6,4-6,7-6 |
| Challenger Hamburg | 2022/10/18 08:00 | Jeremy Jahn v Marko Topo | 6-3,4-6,3-6 |
| Challenger Hamburg | 2022/10/17 09:00 | Kai Wehnelt v Jeremy Jahn | 6-7,6-7 |
| Challenger Hamburg | 2022/10/16 08:00 | Jeremy Jahn v Arthur Reymond | 7-6,6-4 |
| UTR Pro Tennis Series Mulheim | 2022/10/08 11:44 | Jeremy Jahn v Yanais Laurent | 6-4,6-7,2-5 |
| UTR Pro Tennis Series Mulheim | 2022/10/07 09:00 | Jeremy Jahn v Aaron James Williams | 6-3,7-6 |
| Challenger Koblenz | 2023/01/29 13:45 | Johannes Haerteis v Andrea Arnaboldi | 6-4,6-4 |
| ITF M25 Nussloch | 2023/01/25 11:50 | Johannes Haerteis v Elmar Ejupovic | 5-7,6-7 |
| Challenger Drummondville | 2022/11/13 21:25 | Evan King v Johannes Haerteis | 7-6,2-6,2-6 |
| Challenger Calgary | 2022/11/08 23:55 | Johannes Haerteis v Gabriel Decamps | 5-7,4-6 |
| Challenger Calgary | 2022/11/07 18:50 | Alafia Ayeni v Johannes Haerteis | 4-6,3-6 |
| Challenger Calgary | 2022/11/07 00:15 | Philip Florig v Johannes Haerteis | 3-6,2-6 |
| ITF M15 Forbach | 2022/09/29 08:30 | Max Hans Rehberg v Johannes Haerteis | 7-6,6-2 |
| ITF M15 Forbach | 2022/09/27 08:00 | Valentin Faure v Johannes Haerteis | 2-6,1-6 |