Stadium: Court 2 Round: 26 Ground: Hardcourt indoor
| ITF Germany F15 | 2018/10/10 16:45 | Stefan Seifert v Piotr Galus | 6-1,6-2 |
| ITF Germany F11 | 2018/08/07 09:00 | Constantin Schmitz v Stefan Seifert | 7-5,2-6,6-2 |
| 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 Germany F15 | 2018/10/10 09:00 | Julian kenzlers v Karlo Cubelic | 1-6,1-6 |
| ITF Germany F15 | 2018/10/08 08:00 | Dominik Recek v Karlo Cubelic | 3-6,4-6 |
| ITF Germany F15 | 2018/10/07 09:00 | Karlo Cubelic v David Novotny | 7-5,6-4 |
| ITF Germany F14 | 2018/09/30 07:00 | Karlo Cubelic v Tillmann Erdbories | 3-6,4-6 |
| ITF France F19 | 2018/09/24 11:15 | Karlo Cubelic v Mats Rosenkranz | 5-7,7-6,5-7 |
| ITF France F19 Qual | 2018/09/23 10:15 | Thomas Servien v Karlo Cubelic | 3-6,6-7 |
| ITF France F19 Qual | 2018/09/22 12:05 | Karlo Cubelic v Marceau Courtalon | 6-3,6-3 |
| ITF Netherlands F6 | 2018/08/27 10:00 | Alban Meuffels v Karlo Cubelic | 6-4,6-3 |