Stadium: Center Court Round: 27 Ground: Carpet 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 Ismaning | 2019/10/17 16:35 | Julian Lenz v Constant Lestienne | 7-6,6-4 |
| Challenger Ismaning | 2019/10/15 11:30 | Lukas Klein v Julian Lenz | 4-6,3-6 |
| Challenger Ismaning | 2019/10/14 08:00 | Julian Lenz v Jeremy Schifris | 6-3,6-3 |
| Challenger Nur-Sultan 2 | 2019/10/02 09:50 | Denis Istomin v Julian Lenz | 7-5,6-1 |
| Challenger Nur-Sultan 2 | 2019/10/01 09:00 | Julian Lenz v Beibit Zhukayev | 6-2,7-6 |
| Challenger Orleans | 2019/09/24 14:55 | Viktor Durasovic v Julian Lenz | 6-3,7-6 |
| ATP Metz | 2019/09/17 17:45 | Julian Lenz v Pablo Carreno Busta | 1-6,1-6 |
| ATP Metz | 2019/09/16 09:00 | Matthias Bachinger v Julian Lenz | 4-6,4-6 |
| 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 |
| Challenger Glasgow | 2019/09/18 15:05 | Johannes Haerteis v Tobias Kamke | 3-6,4-6 |
| Challenger Glasgow | 2019/09/17 16:10 | Johannes Haerteis v Scott Duncan | 6-3,6-3 |
| Challenger Szczecin | 2019/09/11 14:00 | Albert Ramos-Vinolas v Johannes Haerteis | 6-2,6-4 |
| Challenger Szczecin | 2019/09/09 12:00 | Johannes Haerteis v Mathieu Perchicot | 2-6,6-4,6-2 |