Stadium: Clay 6 Round: 25 Ground: Clay
| 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 |
| ITF Tunisia F32 | 2017/10/22 08:30 | Matt McBride v Niklas Guttau | 3-6,3-6 |
| ITF Tunisia F31 | 2017/10/16 10:30 | Vlad Andrei Dancu v Niklas Guttau | 6-4,6-2 |
| ITF Tunisia F31 | 2017/10/15 08:30 | Vito Dell'Elba v Niklas Guttau | 2-6,0-6 |
| ITF Netherlands F7 | 2017/08/29 14:50 | Stephan Gerritsen v Niklas Guttau | 7-5,6-3 |
| ITF Romania F2 Qual | 2018/05/28 10:40 | Sorin Andrei Iordache v Vasile-Alexandru Ghilea | 3-6,1-6 |
| ITF Romania F2 Qual | 2018/05/27 07:00 | Gabi Adrian Boitan v Sorin Andrei Iordache | 3-6,4-6 |
| ITF Romania F2 Qual | 2018/05/26 07:00 | Sorin Andrei Iordache v George Iulian Dina | 6-3,6-2 |
| ITF Romania F1 | 2018/05/19 09:00 | Mihnea L.S. Turcu v Sorin Andrei Iordache | 6-4,6-2 |
| ITF Turkey F17 | 2018/04/30 06:30 | Sandro Kopp v Sorin Andrei Iordache | 7-6,3-6,7-5 |
| ITF Turkey F17 | 2018/04/29 07:30 | Sorin Andrei Iordache v Martin Atanasov | 6-1,6-3 |
| ITF Turkey F17 | 2018/04/28 07:30 | Sorin Andrei Iordache v Siim Troost | 7-5,3-6,6-3 |
| ITF Turkey F16 | 2018/04/21 09:30 | Mike Urbanija v Sorin Andrei Iordache | 3-6,7-5,6-0 |