Stadium: Court 3 Round: 25 Ground: Hardcourt indoor
| ITF Croatia F2 | 2018/03/13 08:00 | Kai Lemstra v Valentin Royer | 1-6,6-4,6-3 |
| ITF Croatia F2 | 2018/03/11 08:00 | Kai Lemstra v Marco De Rosa | 6-2,6-3 |
| ITF Croatia F1 | 2018/03/07 09:00 | Anze Arh v Kai Lemstra | 7-5,6-1 |
| ITF Germany F3 Qual | 2018/01/29 16:30 | Dominik Boehler v Kai Lemstra | 7-6,7-6 |
| ITF Germany F3 Qual | 2018/01/28 17:00 | Charley Emhardt v Kai Lemstra | 1-6,2-6 |
| ITF Germany F2 | 2018/01/23 15:35 | Kai Lemstra v Pedro Cachin | 3-6,3-6 |
| ITF Germany F1 | 2018/01/11 17:10 | Elmar Ejupovic v Kai Lemstra | 6-3,6-4 |
| ITF Germany F1 | 2018/01/10 11:45 | Stefan Seifert v Kai Lemstra | 6-2,6-7,4-6 |
| ITF Croatia F1 | 2018/03/08 11:00 | Tomislav Jotovski v Bruno Santanna | 6-3,0-6,7-6 |
| ITF Spain F5 | 2018/02/15 10:00 | Sergio Gutierrez-Ferrol v Bruno Santanna | 6-4,6-1 |
| ITF Spain F5 | 2018/02/13 12:45 | Bruno Santanna v Javier Barranco Cosano | 7-5,6-2 |
| ITF Spain F3 | 2018/02/01 09:00 | Bruno Santanna v Javier Barranco Cosano | 4-6,6-7 |
| ITF Spain F3 | 2018/01/29 11:30 | Bruno Santanna v Gian Marco Moroni | 6-3,6-2 |
| ITF Germany F1 | 2018/01/10 13:30 | Jakob Aichhorn v Bruno Santanna | 3-6,6-3,6-2 |
| ITF Mexico F8 | 2017/12/08 15:00 | Bruno Santanna v Federico Zeballos | 6-3,3-6,4-6 |
| ITF Mexico F8 | 2017/12/07 15:00 | Bruno Santanna v Mauricio Resendiz | 5-7,6-4,6-2 |