Stadium: Court 17 Round: 25 Ground: Clay
| ITF Germany F10 | 2018/08/02 13:00 | Constantin Schmitz v Jeroen Vanneste | 6-4,6-7,3-6 |
| ITF Germany F10 | 2018/08/01 11:00 | Jelle Sels v Constantin Schmitz | 6-4,6-7,5-7 |
| ITF Germany F10 Qual | 2018/07/30 12:00 | Kai Breitbach v Constantin Schmitz | 2-6,3-6 |
| ITF Germany F10 Qual | 2018/07/29 13:30 | Felipe Muzzi v Constantin Schmitz | 0-6,0-6 |
| ITF Germany F9 | 2018/07/25 16:00 | Dominik Boehler v Constantin Schmitz | 6-1,6-3 |
| ITF Germany F9 | 2018/07/24 17:30 | George Botezan v Constantin Schmitz | 2-6,7-5,3-6 |
| ITF Germany F9 | 2018/07/23 10:00 | Christian Seraphim v Constantin Schmitz | 3-6,4-6 |
| ITF Germany F9 | 2018/07/22 08:00 | Constantin Schmitz v Tejas Chaukulkar | 6-3,6-1 |
| ITF Ireland F1 | 2018/08/04 12:45 | Stefan Seifert v Ryan James Storrie | 3-6,7-6,3-6 |
| ITF Ireland F1 | 2018/08/03 13:15 | George Botezan v Stefan Seifert | 5-7,0-6 |
| ITF Ireland F1 | 2018/08/02 13:05 | Daniil Zarichanskiy v Stefan Seifert | 2-6,1-6 |
| ITF Ireland F1 | 2018/07/31 14:20 | Michael Shaw v Stefan Seifert | 7-6,4-6,3-6 |
| Challenger Braunschweig Qual | 2018/07/07 15:00 | Stefan Seifert v Jan Satral | 6-7,2-6 |
| Challenger Braunschweig Qual | 2018/07/07 09:55 | Stefan Seifert v Alejo Vilaro | 6-1,3-6,6-3 |
| ITF Israel F11 | 2018/06/29 07:00 | Jordan Hasson v Stefan Seifert | 6-4,6-3 |
| ITF Israel F11 | 2018/06/28 07:00 | Shahar Elbaz v Stefan Seifert | 6-7,6-3,4-6 |