| ITF Germany F3 | 01/30 12:30 | 25 | Valentin Guenther v Karlo Cubelic | 6-7,6-4,6-4 | |
| ITF Germany F16 | 10/23 10:00 | 44 | Shalva Dzhanashia v Valentin Guenther | 6-4,7-5 | |
| ITF Germany F16 | 10/22 08:00 | 44 | Tim Seibert v Valentin Guenther | 6-4,3-6,4-6 | |
| ITF Germany F15 | 10/16 10:00 | 44 | Valentin Guenther v Pavel Motl | Retired | |
| ITF Germany F15 | 10/15 12:00 | 44 | Valentin Guenther v Justin Boulais | 6-3,6-1 | |
| ITF Germany F14 | 10/10 10:00 | 25 | Elmar Ejupovic v Valentin Guenther | 6-4,6-7,6-3 | |
| ITF Germany F14 | 10/09 10:00 | 44 | Shalva Dzhanashia v Valentin Guenther | 5-7,3-6 | |
| ITF Germany F14 | 10/08 11:30 | 44 | Robert Strombachs v Valentin Guenther | 6-2,3-6,4-6 | |
| ITF Italy F30 | 09/18 14:30 | 25 | Valentin Guenther v Maxime Chazal | 1-6,1-6 | |
| ITF Italy F30 | 09/17 13:00 | 54 | Toby Martin v Valentin Guenther | 6-2,6-4 | |
| ITF Italy F30 | 09/16 13:00 | 54 | Denis Golubev v Valentin Guenther | 2-6,2-6 | |
| ITF Italy F29 | 09/13 14:55 | 26 | Valentin Guenther v Benjamin Pietri | 4-6,4-6 | |
| ITF Italy F29 | 09/12 13:00 | 25 | Andrea Basso v Valentin Guenther | 5-7,0-6 | |
| ITF Belgium F11 | 09/01 13:30 | 27 | Valentin Guenther v Julien Dubail | 4-6,6-2,4-6 | |
| ITF Belgium F11 | 08/31 13:50 | 26 | Valentin Guenther v Matteo Martineau | 6-4,3-6,7-6 | |
| ITF Belgium F11 | 08/29 16:00 | 25 | Clement Geens v Valentin Guenther | 5-7,6-7 | |
| ITF Belgium F11 | 08/27 10:00 | 44 | Valentin Guenther v Goran Duquesne | 6-1,6-0 | |
| ITF Belgium F11 | 08/26 10:30 | 44 | Valentin Guenther v Marcel Marlon Sudzum | 6-2,6-2 | |
| ITF Germany F6 | 07/03 12:00 | 44 | Tom Schonenberg v Valentin Guenther | 6-4,7-6 | |
| ITF Germany F6 | 07/02 13:00 | 44 | Robi Tholl v Valentin Guenther | 0-6,1-6 | |
| ITF Germany F5 | 06/27 12:40 | 25 | Valentin Guenther v Peter Heller | 1-6,4-6 | |
| ITF Germany F4 | 06/22 12:00 | 26 | Bernabe Z Miralles v Valentin Guenther | 6-4,6-1 | |
| ITF Germany F4 | 06/21 10:45 | 25 | Valentin Guenther v Niclas Braun | 6-0,6-0 | |
| ITF Germany F4 | 06/19 11:00 | 62 | Alexander Mannapov v Valentin Guenther | 4-6,1-6 | |
| ITF Germany F4 | 06/18 14:00 | 62 | Yannick Staschen v Valentin Guenther | 2-6,4-6 | |
| ITF Germany F4 | 06/17 10:30 | 62 | Joel Vincent Link v Valentin Guenther | 1-6,4-6 | |
| ITF Turkey F19 Qual | 05/15 07:00 | 62 | Valentin Guenther v Juan Bautista Otegui | 3-6,3-6 | |
| ITF Turkey F19 Qual | 05/14 07:00 | 62 | Lance-Pierre Du Toit v Valentin Guenther | 5-7,0-6 | |
| ITF Turkey F19 Qual | 05/13 07:00 | 62 | Valentin Guenther v Burak Bilgin | 6-2,6-2 | |
| ITF Turkey F18 | 05/11 07:00 | 26 | Robin Staněk v Valentin Guenther | 6-4,7-6 |