Stadium: Court M Round: 62 Ground: Clay
| ITF Germany F8 Qual | 2018/07/15 12:30 | Karol Drzewiecki v Tim Seibert | 5-7,2-6 |
| ITF Germany F5 | 2018/06/26 13:40 | Tim Seibert v Christian Hirschmueller | 2-6,6-3,3-6 |
| ITF Germany F16 | 2017/10/22 08:00 | Kai Lemstra v Tim Seibert | 3-6,1-6 |
| ITF Germany F16 | 2017/10/22 08:00 | Tim Seibert v Valentin Guenther | 6-4,3-6,4-6 |
| ITF Germany F15 | 2017/10/16 08:00 | Ryan Peniston v Tim Seibert | 6-1,6-4 |
| ITF Germany F11 | 2017/08/13 13:00 | Jakob Aichhorn v Tim Seibert | 6-4,6-7,6-1 |
| ITF Germany F11 | 2017/08/13 08:00 | Tim Seibert v Marek Flinner | 7-6,6-2 |
| ITF Germany F10 | 2017/08/06 11:00 | Eduardo Dischinger v Tim Seibert | 6-0,7-5 |
| ITF Germany F8 Qual | 2018/07/15 12:30 | Marcel Marlon Sudzum v Niklas Guttau | 4-6,0-6 |
| ITF Germany F8 Qual | 2018/07/15 08:30 | Marlon Vankan v Niklas Guttau | 1-6,2-6 |
| Challenger Braunschweig Qual | 2018/07/07 09:30 | Kimmer Coppejans v Niklas Guttau | 6-3,6-1 |
| ITF Germany F4 | 2018/06/19 10:45 | Wilfredo Gonzalez v Niklas Guttau | 6-3,7-6 |
| ITF Turkey F15 | 2018/04/14 07:30 | Niklas Guttau v Louroi Martinez | 1-6,6-2,0-6 |
| ITF Turkey F14 | 2018/04/07 11:00 | Niklas Guttau v Lucas Hellfritsch | 4-6,3-6 |
| ITF Turkey F13 | 2018/03/31 11:00 | Felipe Meligeni Rodrigues Alves v Niklas Guttau | 6-3,6-1 |
| ITF Tunisia F32 | 2017/10/23 08:30 | Francois-Arthur Vibert v Niklas Guttau | 6-1,6-2 |