Stadium: Court 3 Ground: Hardcourt indoor
| Challenger Ludwigshafen | 2019/07/02 09:00 | Johannes Haerteis v Julian Lenz | 3-6,7-6,7-6 |
| Challenger Sibiu | 2018/09/16 10:35 | Johannes Haerteis v Julian Lenz | 4-6,4-6 |
| ITF Switzerland F1 | 2018/02/06 12:00 | Johannes Haerteis v Julian Lenz | 6-2,1-6,4-6 |
| ITF Czech Republic F2 | 2017/05/27 11:55 | Julian Lenz v Johannes Haerteis | 6-1,6-4 |
| ITF Germany F10 | 2016/08/11 14:25 | Julian Lenz v Johannes Haerteis | 5-7,6-3,3-6 |
| Challenger Eckental | 2020/11/04 12:55 | Sebastian Korda v Johannes Haerteis | 6-2,1-6,6-1 |
| Challenger Eckental | 2020/11/02 18:40 | Yannick Maden v Johannes Haerteis | 2-6,6-4,3-6 |
| Challenger Eckental | 2020/11/01 13:15 | Lukas Klein v Johannes Haerteis | 1-6,4-6 |
| Challenger Eckental | 2020/10/31 09:00 | Leopold Zima v Johannes Haerteis | 0-6,3-6 |
| Challenger Ismaning | 2020/10/17 14:20 | Hugo Grenier v Johannes Haerteis | 6-3,6-4 |
| ITF M25 Porto | 2020/10/01 11:30 | Alessandro Bega v Johannes Haerteis | 6-4,0-6,7-5 |
| ITF M25 Porto | 2020/09/30 10:30 | Emilio Nava v Johannes Haerteis | 6-1,4-6,2-6 |
| Challenger Sibiu | 2020/09/24 08:00 | Johannes Haerteis v Carlos Gomez-Herrera | 3-6,7-6,2-6 |
| Challenger Bratislava | 2020/11/07 16:15 | Vadym Ursu v Julian Lenz | 1-6,2-6 |
| Challenger Eckental | 2020/11/03 09:00 | Matthias Bachinger v Julian Lenz | 4-6,7-6,6-1 |
| Challenger Hamburg | 2020/10/24 17:30 | Julian Lenz v Tobias Kamke | 3-6,1-6 |
| Challenger Ismaning | 2020/10/22 10:30 | Julian Lenz v Sebastian Korda | 6-7,3-6 |
| Challenger Ismaning | 2020/10/20 10:30 | Julian Lenz v Juan Pablo Ficovich | 5-7,7-5,6-4 |
| Challenger Ismaning | 2020/10/18 11:50 | Hugo Grenier v Julian Lenz | 3-6,4-6 |
| Challenger Ismaning | 2020/10/17 15:40 | Michael Weindl v Julian Lenz | 1-6,2-6 |
| French Open | 2020/09/21 11:30 | Julian Lenz v Tomas Machac | 2-6,5-7 |