| ITF M15 Horgen | 08/29 15:05 | 26 | Valentin Guenther v Pascal Meis | Retired | |
| ITF M15 Horgen | 08/28 11:25 | 25 | Antoine Bellier v Valentin Guenther | 4-6,7-6,3-6 | |
| ITF M15 Ueberlingen | 08/22 08:00 | 26 | Peter Heller v Valentin Guenther | 6-4,6-3 | |
| ITF M15 Ueberlingen | 08/21 09:35 | 25 | Valentin Guenther v Manfred Fellin | 3-6,6-2,6-1 | |
| ITF M25 Kassel | 07/19 12:00 | 27 | Sadio Doumbia v Valentin Guenther | 7-5,6-2 | |
| ITF M25 Kassel | 07/18 09:00 | 26 | Marek Gengel v Valentin Guenther | 7-6,2-6,4-6 | |
| ITF M25 Kassel | 07/17 09:30 | 25 | Valentin Guenther v Fabien Reboul | 6-4,2-6,6-1 | |
| ITF M25 Kassel | 07/16 09:25 | 54 | Markus Wunder v Valentin Guenther | 1-6,5-7 | |
| ITF M15 Marburg | 07/11 17:40 | 26 | Robin Stanek v Valentin Guenther | 6-1,7-6 | |
| ITF M15 Marburg | 07/10 13:40 | 25 | Valentin Guenther v James Frawley | 6-4,7-6 | |
| ITF M15 Marburg | 07/08 09:00 | 54 | Valentin Guenther v Jannis Kahlke | 6-4,6-2 | |
| ITF M15 Marburg | 07/08 07:00 | 54 | Valentin Guenther v Mislav Bosnjak | 3-6,6-1,10-7 | |
| ITF M15 Saarlouis | 07/03 16:40 | 25 | Valentin Guenther v Raphael Baltensperger | 2-6,6-7 | |
| ITF M15 Saarlouis | 07/01 10:00 | 54 | Valentin Guenther v Ludvig Aaes | 6-1,6-3 | |
| ITF M15 Saarlouis | 07/01 08:00 | 54 | Valentin Guenther v Nicholas Bybel | 6-4,6-3 | |
| ITF M15 Kamen | 06/26 16:05 | 25 | Valentin Guenther v Peter Heller | 6-4,6-7,1-6 | |
| ITF M15 Kamen | 06/24 12:00 | 54 | Valentin Guenther v Nicholas Bybel | 6-4,6-2 | |
| ITF M15 Kamen | 06/24 08:00 | 54 | Valentin Guenther v Tadas Tarasevicius | 6-1,6-2 | |
| ITF M15 Heraklion | 05/30 07:00 | 26 | Erik Crepaldi v Valentin Guenther | 5-7,6-0,6-3 | |
| ITF M15 Heraklion | 05/29 07:00 | 25 | Valentin Guenther v Pablo V-Gonzalez | 7-6,7-5 | |
| ITF M15 Heraklion | 05/22 13:05 | 25 | Paul Cayre v Valentin Guenther | 7-6,6-2 | |
| ITF M15 Heraklion | 05/20 13:00 | 54 | Valentin Guenther v Adam Jones | 7-6,6-0 | |
| ITF M15 Heraklion | 05/16 08:20 | 26 | Peter Bothwell v Valentin Guenther | 6-2,6-2 | |
| ITF M15 Heraklion | 05/15 11:45 | 25 | Boris Pokotilov v Valentin Guenther | 6-7,6-3,3-6 | |
| ITF M15 Heraklion | 05/13 07:00 | 54 | Valentin Guenther v Ervin H Eminefendic | 6-4,6-2 | |
| ITF M15 Heraklion | 05/09 07:00 | 26 | Lloyd Glasspool v Valentin Guenther | 7-6,6-4 | |
| ITF M15 Heraklion | 05/07 10:00 | 25 | Valentin Guenther v Aaron Addison | 6-3,7-6 | |
| ITF M25 Sunderland | 04/08 09:40 | 54 | Valentin Guenther v Johannus Monday | Walkover | |
| ITF M25 Bolton | 04/01 08:00 | 54 | Elliott Farmer v Valentin Guenther | 6-3,7-5 | |
| ITF M15 Poitiers | 03/11 16:35 | 45 | Pierre Faivre v Valentin Guenther | 6-1,6-2 |