Stadium: Ahnatal C8 Round: 62 Ground: Clay
| Challenger Marburg Qual | 2018/06/30 14:25 | Marlon Vankan v Moez Echargui | 3-6,3-6 |
| ITF France F6 Qual | 2018/03/17 12:30 | Marlon Vankan v Roy, Matthieu | 2-6,3-6 |
| Challenger Koblenz Qual | 2018/01/15 14:20 | Heyman, Christopher v Marlon Vankan | 6-1,7-6 |
| ITF Germany F11 | 2017/08/13 13:00 | Dan Added v Marlon Vankan | 6-3,6-1 |
| ITF Germany F11 | 2017/08/13 08:00 | Rehberg, Marvin v Marlon Vankan | 5-7,3-6 |
| ITF Germany F7 | 2017/07/09 08:00 | Marlon Vankan v Raphael Calzi | 6-3,2-6,1-6 |
| ITF Germany F7 | 2017/07/09 08:00 | Marlon Vankan v Oscar Galimardanov | 6-3,6-4 |
| ITF Germany F6 | 2017/07/02 08:00 | Bertsch, Jochen v Marlon Vankan | 7-5,3-6,6-3 |
| Challenger Braunschweig Qual | 2018/07/07 09:30 | Kimmer Coppejans v Guttau, Niklas | 6-3,6-1 |
| ITF Germany F4 | 2018/06/19 10:45 | Gonzalez, Wilfredo v Guttau, Niklas | 6-3,7-6 |
| Turkey F15, Singles Qualifying | 2018/04/14 07:30 | Guttau, Niklas v Louroi Martinez | 1-6,6-2,0-6 |
| Turkey F14, Singles Qualifying | 2018/04/07 11:00 | Guttau, Niklas v Hellfritsch, Lucas | 4-6,3-6 |
| ITF Turkey F13 | 2018/03/31 11:00 | Felipe Meligeni Rodrigues Alves v Guttau, Niklas | 6-3,6-1 |
| ITF Tunisia F32 | 2017/10/23 08:30 | Vibert, Francois Arthur v Guttau, Niklas | 6-1,6-2 |
| ITF Tunisia F32 | 2017/10/22 08:30 | Mcbride, Matt v Guttau, Niklas | 3-6,3-6 |
| ITF Tunisia F31 | 2017/10/16 10:30 | Vlad Andrei Dancu v Guttau, Niklas | 6-4,6-2 |