| ITF Belgium F14 | 09/12 10:00 | 25 | Billy Harris v Guenther, Valentin | 6-2,3-6,6-3 | |
| ITF Belgium F14 | 09/10 12:00 | 44 | Hoeveler, Leon v Guenther, Valentin | 6-7,3-6 | |
| ITF Belgium F13 | 09/07 09:40 | 25 | Guenther, Valentin v Vanneste, Jeroen | 4-6,5-7 | |
| ITF Belgium F13 Qual | 09/05 14:35 | 44 | Czepielewski, Daniel v Guenther, Valentin | 4-6,3-6 | |
| ITF Belgium F13 Qual | 09/05 08:00 | 44 | Pashayan, Daniel v Guenther, Valentin | 2-6,2-6 | |
| ITF Belgium F12 | 08/28 10:00 | 54 | Guenther, Valentin v Kevelaerts, Jakob | 2-6,6-1,2-6 | |
| ITF Belgium F12 | 08/27 07:00 | 54 | Guenther, Valentin v Gadamauri, Turpal | Retired | |
| ITF Germany F12 | 08/23 08:00 | 25 | Guenther, Valentin v Wilson Leite | 6-7,2-6 | |
| ITF Germany F12 | 08/22 09:50 | 54 | Kapric, Denis v Guenther, Valentin | 3-6,5-7 | |
| ITF Germany F11 | 08/17 12:00 | 25 | Guenther, Valentin v Boehler, Dominik | 1-6,3-6 | |
| ITF Germany F11 | 08/15 10:00 | 62 | Guenther, Valentin v Novotny, David | 6-0,6-2 | |
| ITF Germany F11 | 08/14 12:00 | 62 | Guenther, Valentin v Mayer, Patrick | 6-3,4-6,6-4 | |
| ITF Germany F7 | 07/11 12:00 | 44 | Luc Fomba v Guenther, Valentin | 6-4,0-6,7-6 | |
| ITF Germany F2 Qual | 01/17 12:00 | 62 | Elmar Ejupovic v Guenther, Valentin | 6-4,6-3 | |
| ITF Germany F15 | 10/04 08:00 | 62 | Guenther, Valentin v Jakob Schnaitter | 3-6,4-6 | |
| ITF Germany F13 | 08/27 08:30 | 26 | Obert, Adrian v Guenther, Valentin | 3-6,6-4,6-2 | |
| ITF Germany F13 | 08/25 09:35 | 25 | Kapric, Denis v Guenther, Valentin | 4-6,3-6 |