Stadium: Sparkassen Court Round: 54 Ground: Clay
| ITF Germany F2 Qual | 2017/01/15 12:00 | Guenther, Valentin v Kahlke, Jannis | 3-6,6-7 |
| ITF Germany F17 | 2016/10/31 09:00 | Kahlke, Jannis v Guenther, Valentin | 3-6,0-6 |
| ITF M15 Marburg | 2019/07/08 07:00 | Guenther, Valentin v Bosnjak, Mislav | 3-6,6-1,10-7 |
| Saarlouis, Singles Qualifying M-ITF-GER-07A | 2019/07/03 16:40 | Guenther, Valentin v Baltensperger, Raphael | 2-6,6-7 |
| Saarlouis, Singles Qualifying M-ITF-GER-07A | 2019/07/01 10:00 | Guenther, Valentin v Aaes, Ludvig | 6-1,6-3 |
| Saarlouis, Singles Qualifying M-ITF-GER-07A | 2019/07/01 08:00 | Guenther, Valentin v Bybel, Nicholas | 6-4,6-3 |
| ITF M15 Kamen | 2019/06/26 16:05 | Guenther, Valentin v Peter Heller | 6-4,6-7,1-6 |
| ITF M15 Kamen | 2019/06/24 12:00 | Guenther, Valentin v Bybel, Nicholas | 6-4,6-2 |
| ITF M15 Kamen | 2019/06/24 08:00 | Guenther, Valentin v Tarasevicius, Tadas | 6-1,6-2 |
| ITF - M15 Héraklion | 2019/05/30 07:00 | Crepaldi, Erik v Guenther, Valentin | 5-7,6-0,6-3 |
| ITF M15 Marburg | 2019/07/08 07:00 | Hain, Jan Soeren v Kahlke, Jannis | 6-7,4-6 |
| ITF M15 Kaarst | 2019/02/04 08:30 | Daniel De Jonge v Kahlke, Jannis | 7-5,6-4 |
| ITF - M15 Sharm El Sheikh | 2019/01/21 09:30 | Kacper Zuk v Kahlke, Jannis | 7-5,6-0 |
| ITF Egypt F28 | 2018/11/22 09:15 | Kahlke, Jannis v Dougaz, Aziz | 2-6,6-7 |
| ITF Egypt F28 | 2018/11/21 13:10 | Kahlke, Jannis v Vehovec, Jan | 6-0,6-0 |
| ITF Egypt F28 | 2018/11/19 08:00 | Pisane, Tom v Kahlke, Jannis | 3-6,4-6 |
| ITF Egypt F28 | 2018/11/18 08:00 | Kahlke, Jannis v Zharyn, Dzianis | 7-6,6-3 |
| ITF Egypt F27 | 2018/11/16 08:00 | Kahlke, Jannis v Johan Nikles | 6-1,3-6,3-6 |