Stadium: Court 3 Round: 44 Ground: Hardcourt outdoor
| ITF Portugal F7 | 2018/04/11 09:00 | Prechtel, Sebastian v Niesten, Miliaan | 6-7,2-6 |
| ITF Portugal F7 Qual | 2018/04/09 13:10 | Prechtel, Sebastian v Mora, Maxime | 7-6,6-4 |
| ITF Portugal F7 Qual | 2018/04/08 19:00 | Prechtel, Sebastian v Tomas C Abasolo | 1-6,6-3,7-5 |
| ITF Croatia F3 | 2018/03/21 09:00 | Viola, Matteo v Prechtel, Sebastian | 6-1,6-2 |
| ITF Croatia F2 | 2018/03/14 10:35 | Prechtel, Sebastian v Nik Razborsek | 1-6,6-4,4-6 |
| ITF Croatia F1 | 2018/03/07 09:00 | Prechtel, Sebastian v Kranic, Karlo | 2-6,7-5,4-10 |
| ITF Croatia F1 | 2018/03/04 15:00 | Prechtel, Sebastian v Nincevic, Frane | 6-4,7-5 |
| Challenger Eckental Qual | 2017/10/30 11:30 | Evan Furness v Prechtel, Sebastian | 7-5,6-1 |
| ITF Portugal F8 Qual | 2018/04/15 11:30 | Alves, Simao v Moura, Hugo | 6-2,6-1 |
| ITF Portugal F7 Qual | 2018/04/08 19:00 | Okala, Jules v Alves, Simao | 6-2,6-3 |
| ITF Portugal F7 Qual | 2018/04/07 19:00 | Alves, Simao v Vide, Pedro | 6-2,6-0 |
| ITF Portugal F5 Qual | 2018/03/19 10:00 | Alves, Simao v Leote Prata, Martim | 1-6,3-6 |
| ITF Portugal F5 Qual | 2018/03/18 12:30 | Alves, Simao v Muzzi, Felipe | 6-4,6-3 |
| Portugal F4, Singles Qualifying | 2018/03/11 11:30 | Moura, Hugo v Alves, Simao | 2-6,0-6 |
| Portugal F4, Singles Qualifying | 2018/03/11 11:30 | Yann Marti v Alves, Simao | 6-0,6-1 |
| ITF Portugal F21 | 2017/10/01 10:00 | Canas Garcia, Juan Pablo v Alves, Simao | 6-3,6-4 |