Stadium: Court A Round: 45 Ground: Hardcourt indoor
| Czech Republic F11, Singles Qualifying | 2018/11/19 12:30 | Guenther, Valentin v Emilien Voisin | 6-1,6-2 |
| ITF - M15 Grenoble | 2019/02/05 15:20 | Geoffrey Blancaneaux v Emilien Voisin | 7-6,6-2 |
| ITF Czech Republic F12 | 2018/11/26 09:00 | Bisko, Michal v Emilien Voisin | 6-3,1-6,6-2 |
| Czech Republic F11, Singles Qualifying | 2018/11/19 12:30 | Guenther, Valentin v Emilien Voisin | 6-1,6-2 |
| ITF France F21 | 2018/10/06 13:20 | Freire Da Silva, Diamant v Emilien Voisin | 6-2,6-3 |
| France F20, Singles | 2018/10/02 11:30 | Jacq, Gregoire v Emilien Voisin | 6-1,6-1 |
| ITF Netherlands F3 | 2018/07/07 11:30 | Bodin, Joris v Emilien Voisin | 6-3,6-3 |
| ITF France F12 | 2018/07/02 11:25 | Emilien Voisin v Joffrey De Schepper | 1-6,4-6 |
| ITF France F9 | 2018/05/02 15:00 | Emilien Voisin v Maxime Chazal | 7-6,3-6,0-6 |
| Oslo, Singles M-ITF-NOR-01A | 2019/03/05 09:00 | Guenther, Valentin v Mayer, Patrick | 1-6,6-3,9-11 |
| ITF - M15 Monastir | 2019/02/07 08:00 | Jacopo Berrettini v Guenther, Valentin | 5-7,7-5,7-5 |
| ITF - M15 Monastir | 2019/02/06 13:40 | Guenther, Valentin v Mohanty, Arnav | 6-4,6-0 |
| ITF - M15 Monastir | 2019/01/31 11:40 | Corentin Denolly v Guenther, Valentin | 6-3,6-4 |
| ITF - M15 Monastir | 2019/01/30 09:00 | Ivanov, Simon Anthony v Guenther, Valentin | 5-7,6-1,2-6 |
| ITF - M15 Monastir | 2019/01/28 10:00 | Guenther, Valentin v Gostincar, Domen | 6-4,3-6,10-6 |
| ITF - M15 Monastir | 2019/01/21 08:30 | Guenther, Valentin v Gostincar, Domen | 6-2,1-6,7-10 |
| ITF Qatar F6 | 2018/12/18 07:00 | Zhurbin, Alexander v Guenther, Valentin | 3-6,6-3,6-2 |