Stadium: Court 3 Round: 25 Ground: Hardcourt outdoor
| ITF Portugal F7 Qual | 2018/04/09 13:10 | Sebastian Prechtel v Maxime Mora | 7-6,6-4 |
| ITF Portugal F7 Qual | 2018/04/08 19:00 | Sebastian Prechtel v Tomas C Abasolo | 1-6,6-3,7-5 |
| ITF Croatia F3 | 2018/03/21 09:00 | Matteo Viola v Sebastian Prechtel | 6-1,6-2 |
| ITF Croatia F2 | 2018/03/14 10:35 | Sebastian Prechtel v Nik Razborsek | 1-6,6-4,4-6 |
| ITF Croatia F1 | 2018/03/07 09:00 | Sebastian Prechtel v Karlo Kranic | 2-6,7-5,4-10 |
| ITF Croatia F1 | 2018/03/04 15:00 | Sebastian Prechtel v Frane Nincevic | 6-4,7-5 |
| Challenger Eckental Qual | 2017/10/30 11:30 | Evan Furness v Sebastian Prechtel | 7-5,6-1 |
| Challenger Eckental Qual | 2017/10/29 09:00 | Sebastian Prechtel v Fabian Penzkofer | 6-2,6-1 |
| ITF Portugal F7 Qual | 2018/04/09 10:00 | Miliaan Niesten v Daniel Batista | 5-7,6-2,6-2 |
| ITF Portugal F7 Qual | 2018/04/08 16:00 | Miliaan Niesten v Duarte Nuno Teixeira | 6-3,6-3 |
| ITF Portugal F5 | 2018/03/21 14:10 | Pablo Vivero Gonzalez v Miliaan Niesten | 6-2,6-3 |
| ITF Portugal F5 Qual | 2018/03/19 11:00 | Miliaan Niesten v Pedro Gabriel Rodrigues | 6-1,6-4 |
| ITF Portugal F5 Qual | 2018/03/18 12:30 | Miliaan Niesten v Jonathan Binding | 4-6,6-3,6-1 |
| ITF Portugal F4 | 2018/03/14 11:20 | Peter Bothwell v Miliaan Niesten | 6-4,6-2 |
| ITF Portugal F4 | 2018/03/13 11:00 | Lucas Hellfritsch v Miliaan Niesten | 0-6,2-6 |
| ITF Portugal F3 | 2018/03/10 13:35 | Frederico Ferreira Silva v Miliaan Niesten | 6-2,6-3 |