Stadium: C2 Round: 27 Ground: Carpet indoor
| ITF Switzerland F1 | 2018/02/08 12:00 | Albano Olivetti v Lenz, Julian | 7-5,5-7,6-7 |
| ITF Switzerland F1 | 2018/02/06 12:00 | Haerteis, Johannes v Lenz, Julian | 6-2,1-6,4-6 |
| ITF Germany F2 | 2018/01/23 11:30 | Lenz, Julian v Botic Van De Zandschulp | 6-7,3-6 |
| Challenger Koblenz Qual | 2018/01/14 12:25 | Pedro Cachin v Lenz, Julian | 6-1,6-3 |
| ITF Turkey F47 | 2017/12/15 07:15 | Wang, Tak Khunn v Lenz, Julian | 6-4,6-3 |
| ITF Turkey F47 | 2017/12/14 08:50 | Gore, Kaya v Lenz, Julian | 2-6,1-6 |
| ITF Turkey F47 | 2017/12/12 07:15 | Chadaj, Adam v Lenz, Julian | 6-3,3-6,6-7 |
| ITF USA F39 | 2017/11/30 17:00 | Thomas, Danny v Lenz, Julian | 7-6,1-6,6-4 |
| ITF Switzerland F1 | 2018/02/08 15:20 | Simon, Tobias v Ugo Humbert | 6-7,6-1,7-6 |
| ITF Switzerland F1 | 2018/02/07 16:20 | Elmar Ejupovic v Simon, Tobias | 4-6,6-7 |
| ITF Germany F3 | 2018/02/01 11:00 | Simon, Tobias v Botic Van De Zandschulp | 4-6,7-5,6-7 |
| ITF Germany F3 | 2018/01/30 13:50 | Simon, Tobias v Greven, Marvin | 7-6,6-4 |
| ITF Germany F2 | 2018/01/25 10:00 | Simon, Tobias v Daniel Masur | 5-7,3-6 |
| ITF Germany F2 | 2018/01/23 10:00 | Simon, Tobias v Paul Woerner | 7-6,1-6,7-6 |
| ITF Germany F1 | 2018/01/13 12:00 | Krawietz, Kevin v Simon, Tobias | 6-2,3-6,7-6 |
| ITF Germany F1 | 2018/01/11 15:00 | Kern, Robin v Simon, Tobias | 6-3,6-7,6-7 |