Stadium: Center Court Round: 25 Ground: Clay
| ITF Belgium F14 | 2016/09/10 12:00 | Hoeveler, Leon v Guenther, Valentin | 6-7,3-6 |
| ITF Turkey F21 | 2018/05/29 09:10 | Mats Rosenkranz v Guenther, Valentin | 6-0,3-6,6-4 |
| Turkey F20, Singles Qualifying | 2018/05/24 07:30 | Paul Woerner v Guenther, Valentin | 6-2,6-3 |
| Turkey F20, Singles Qualifying | 2018/05/23 07:30 | Louroi Martinez v Guenther, Valentin | 2-6,0-6 |
| ITF Turkey F19 | 2018/05/15 08:25 | Koray Kirci v Guenther, Valentin | 7-5,6-3 |
| Egypt F14, Singles Qualifying | 2018/04/19 08:00 | Guenther, Valentin v Vivero Gonzalez, Pablo | 2-6,6-7 |
| Egypt F14, Singles Qualifying | 2018/04/18 08:00 | Vigani, Joy v Guenther, Valentin | 3-6,4-6 |
| ITF Egypt F13 | 2018/04/09 08:30 | Khotkov, Oleg v Guenther, Valentin | 2-6,6-3,7-6 |
| ITF Egypt F13 | 2018/04/08 08:00 | Kohl, Cristopher v Guenther, Valentin | 4-6,4-6 |
| ITF Germany F4 | 2018/06/18 11:00 | Hoeveler, Leon v Robert Strombachs | 1-6,2-6 |
| ITF Czech Republic F2 Qual | 2018/05/21 08:00 | Hoeveler, Leon v Kody Pearson | 6-3,6-7,3-6 |
| ITF Czech Republic F2 Qual | 2018/05/20 09:00 | Hoeveler, Leon v Podlesak, Marek | 6-1,6-1 |
| ITF Italy F8 Qual | 2018/04/15 12:00 | Wilson Leite v Hoeveler, Leon | 6-3,7-6 |
| ITF Italy F7 Qual | 2018/04/08 12:00 | Capalbo, Franco v Hoeveler, Leon | 6-0,6-2 |
| ITF France F6 Qual | 2018/03/18 10:00 | Alexis Boureau v Hoeveler, Leon | 6-1,6-0 |
| ITF France F6 Qual | 2018/03/17 11:40 | Muesser, Yanis v Hoeveler, Leon | 2-6,1-6 |
| ITF Greece F3 | 2018/03/10 10:00 | Kohl, Cristopher v Hoeveler, Leon | 6-2,6-3 |