Stadium: Clay 6 Round: 25 Ground: Clay
| ITF Turkey F31 | 2018/10/08 07:00 | Liska, Tomas v Guttau, Niklas | 4-6,6-2,2-6 |
| ITF Turkey F31 | 2018/10/07 07:00 | Wakita, Shunsuke v Guttau, Niklas | 4-6,3-6 |
| ITF Turkey F31 | 2018/10/06 07:00 | Guttau, Niklas v Myagkov, Dmitry | 6-2,6-3 |
| ITF Turkey F30 | 2018/10/02 07:00 | Vanneste, Jeroen v Guttau, Niklas | 6-2,6-3 |
| ITF Turkey F30 | 2018/10/01 07:30 | Guttau, Niklas v Vicentiu Andrei Niculescu | 6-3,6-0 |
| ITF Turkey F30 | 2018/09/30 07:30 | Besednikov, Oleg v Guttau, Niklas | 5-7,0-6 |
| ITF Turkey F30 | 2018/09/29 07:00 | Guttau, Niklas v Neil Oberleitner | 6-3,6-4 |
| ITF Netherlands F5 | 2018/08/19 10:00 | Guttau, Niklas v Bruna, Esteban | 3-6,4-6 |
| ITF Turkey F30 | 2018/10/02 09:00 | Iordache, Sorin Andrei v Lucas Gerch | 6-7,4-6 |
| ITF Turkey F29 | 2018/09/26 07:30 | Iordache, Sorin Andrei v Walder, Jim | 2-6,1-6 |
| ITF Turkey F29 | 2018/09/24 09:00 | Iordache, Sorin Andrei v Mert Alkaya | 6-3,6-0 |
| ITF Turkey F29 | 2018/09/23 09:30 | Bosancic, Thomas v Iordache, Sorin Andrei | 6-7,6-7 |
| ITF Turkey F29 | 2018/09/22 09:30 | Iordache, Sorin Andrei v Shchaya-Zubrov, Pavel | 6-4,6-4 |
| ITF Romania F13 | 2018/09/09 07:00 | Neil Oberleitner v Iordache, Sorin Andrei | 6-7,6-2,6-3 |
| ITF Serbia F2 | 2018/08/11 07:00 | Radinski, Aljaz v Iordache, Sorin Andrei | 6-0,6-1 |
| ITF Georgia F2 | 2018/07/16 08:00 | Iordache, Sorin Andrei v Ghilea, Vasile-Alexandru | 3-6,5-7 |