Stadium: Center Court Round: 25 Ground: Clay
| ITF Turkey F21 | 2018/05/29 09:10 | Mats Rosenkranz v Valentin Guenther | 6-0,3-6,6-4 |
| ITF Turkey F20 | 2018/05/24 07:30 | Paul Woerner v Valentin Guenther | 6-2,6-3 |
| ITF Turkey F20 | 2018/05/23 07:30 | Louroi Martinez v Valentin Guenther | 2-6,0-6 |
| ITF Turkey F19 | 2018/05/15 08:25 | Koray Kirci v Valentin Guenther | 7-5,6-3 |
| ITF Egypt F14 | 2018/04/19 08:00 | Valentin Guenther v Pablo Vivero Gonzalez | 2-6,6-7 |
| ITF Egypt F14 | 2018/04/18 08:00 | Joy Vigani v Valentin Guenther | 3-6,4-6 |
| ITF Egypt F13 | 2018/04/09 08:30 | Oleg Khotkov v Valentin Guenther | 2-6,6-3,7-6 |
| ITF Egypt F13 | 2018/04/08 08:00 | Cristopher Kohl v Valentin Guenther | 4-6,4-6 |
| ITF Italy F14 | 2018/06/16 14:00 | Nik Razborsek v Riccardo Bellotti | 4-6,3-6 |
| ITF Italy F14 | 2018/06/15 14:30 | Nik Razborsek v Jacopo Berrettini | 6-4,6-4 |
| ITF Italy F14 | 2018/06/14 16:00 | Giovanni Fonio v Nik Razborsek | 6-7,2-6 |
| ITF Italy F14 | 2018/06/13 17:45 | Nik Razborsek v Martins Podzus | 6-2,6-1 |
| ITF Italy F14 | 2018/06/11 15:15 | Filippo Leonardi v Nik Razborsek | 6-4,4-6,4-6 |
| ITF Bosnia and Herzegovina F3 | 2018/06/01 13:00 | Elmar Ejupovic v Nik Razborsek | 6-3,6-4 |
| ITF Bosnia and Herzegovina F3 | 2018/05/31 11:00 | Marko Vujic v Nik Razborsek | 1-6,0-6 |
| ITF Bosnia and Herzegovina F3 | 2018/05/30 09:00 | Johan Nikles v Nik Razborsek | 1-6,5-7 |