Stadium: C2 Round: 25 Ground: Carpet indoor
| 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 |
| ITF Switzerland F1 Qual | 2018/02/05 09:00 | Johannes Haerteis v Giordan Kunz | 6-3,6-3 |
| ITF Egypt F2 | 2018/01/24 09:40 | Johannes Haerteis v Youssef Hossam | 6-7,4-6 |
| ITF Egypt F2 | 2018/01/22 08:00 | Hugo Pierre v Johannes Haerteis | 6-7,1-6 |
| ITF Egypt F2 | 2018/01/21 10:00 | Vinayak Sharma Kaza v Johannes Haerteis | 3-6,2-6 |
| ITF Egypt F2 | 2018/01/20 08:00 | Ilco Van Buuren v Johannes Haerteis | 3-6,2-6 |
| ITF Egypt F1 | 2018/01/15 10:00 | Johannes Haerteis v Fabian Marozsan | 2-6,4-6 |
| ITF Egypt F1 | 2018/01/14 08:00 | Johannes Haerteis v Jannik Sinner | 6-3,5-7,7-5 |
| Challenger Eckental Qual | 2017/10/28 09:00 | Evan Furness v Johannes Haerteis | 3-6,7-6,7-6 |
| ITF Germany F2 | 2018/01/23 11:30 | Julian Lenz v Botic Van De Zandschulp | 6-7,3-6 |
| Challenger Koblenz Qual | 2018/01/14 12:25 | Pedro Cachin v Julian Lenz | 6-1,6-3 |
| ITF Turkey F47 | 2017/12/15 07:15 | Tak Khunn Wang v Julian Lenz | 6-4,6-3 |
| ITF Turkey F47 | 2017/12/14 08:50 | Kaya Gore v Julian Lenz | 2-6,1-6 |
| ITF Turkey F47 | 2017/12/12 07:15 | Adam Chadaj v Julian Lenz | 6-3,3-6,6-7 |
| ITF USA F39 | 2017/11/30 17:00 | Danny Thomas v Julian Lenz | 7-6,1-6,6-4 |
| ITF USA F39 | 2017/11/29 18:00 | Jeffrey Schorsch v Julian Lenz | 3-6,6-2,3-6 |
| ITF USA F39 | 2017/11/27 23:25 | Johannes Schretter v Julian Lenz | 2-6,2-6 |