Stadium: Court 2 Round: 25 Ground: Carpet indoor
| ITF Germany F14 | 2018/10/04 10:00 | Christoph Negritu v Guenther, Valentin | 3-6,7-5,7-5 |
| ITF Germany F14 | 2018/10/03 11:35 | Aichhorn, Jakob v Guenther, Valentin | 3-6,2-6 |
| ITF Belgium F10 | 2018/08/28 08:00 | Guenther, Valentin v Mariano Kestelboim | 3-6,1-6 |
| ITF Germany F13 | 2018/08/21 08:00 | Kai Wehnelt v Guenther, Valentin | 7-5,6-1 |
| ITF Netherlands F3 | 2018/07/11 12:50 | Huertas Del Pino Cordova, Arklon v Guenther, Valentin | 3-6,6-3,7-5 |
| ITF Netherlands F3 | 2018/07/10 12:00 | Yanais Laurent v Guenther, Valentin | 3-6,3-6 |
| ITF Netherlands F3 | 2018/07/07 09:30 | Guenther, Valentin v Khlif, Noe | 4-6,6-2,6-4 |
| ITF Netherlands F3 | 2018/07/07 08:00 | Guenther, Valentin v Roland Stuurman | 3-6,6-2,6-2 |
| St. Petersburg, Russia | 2018/09/17 09:35 | Ilya Ivashka v Tyurnev, Evgeny | 7-6,7-6 |
| St. Petersburg, Russia | 2018/09/16 13:50 | Tyurnev, Evgeny v Robert, Stephane | 6-3,6-4 |
| ITF Romania F13 | 2018/09/13 10:40 | Tyurnev, Evgeny v Oleksii Krutykh | 5-7,3-6 |
| ITF Romania F13 | 2018/09/12 09:00 | Tyurnev, Evgeny v Lima-Perez, Jeremias | 6-3,6-3 |
| ITF Russia F8 | 2018/09/01 08:00 | Kravchuk, Konstantin v Tyurnev, Evgeny | 1-6,1-6 |
| ITF Russia F8 | 2018/08/31 08:00 | Danilov, Savriyan v Tyurnev, Evgeny | 2-6,6-3,1-6 |
| ITF Russia F8 | 2018/08/30 08:00 | Bogdan Bobrov v Tyurnev, Evgeny | 4-6,1-6 |
| ITF Russia F8 | 2018/08/28 08:30 | Feitt, Franco v Tyurnev, Evgeny | 7-6,3-6,4-6 |