Round: 62 Ground: Clay
| ITF Netherlands F2 | 2018/07/03 10:05 | Valentin Guenther v Patrik Niklas-Salminen | 4-6,3-6 |
| ITF Netherlands F2 Qual | 2018/07/02 11:45 | Valentin Guenther v Tillmann Erdbories | 6-7,6-1,2-6 |
| ITF Netherlands F2 Qual | 2018/07/01 08:00 | Valentin Guenther v Thorsten Sollie | 7-6,6-7,6-4 |
| ITF Netherlands F1 Qual | 2018/06/24 09:00 | Valentin Guenther v Bobbie De Goeijen | 2-6,3-6 |
| ITF Germany F4 | 2018/06/21 08:30 | Dominik Boehler v Valentin Guenther | 6-4,6-4 |
| ITF Germany F4 | 2018/06/19 14:35 | Valentin Guenther v Leon Hoeveler | 6-3,6-2 |
| 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 Netherlands F2 Qual | 2018/06/30 09:30 | Roland Stuurman v Nick Broekhof | 6-3,3-6,3-6 |
| ITF Netherlands F1 Qual | 2018/06/24 09:00 | Roland Stuurman v Gabriel Decamps | 1-6,4-6 |
| ITF Netherlands F1 Qual | 2018/06/23 08:00 | Roland Stuurman v Max Van Wijk | 6-1,6-0 |