| Challenger Porto | 2021/06/29 16:40 | Sem Verbeek v Gastao Elias | 7-6,4-6,1-6 |
| Challenger Porto | 2021/06/28 10:00 | Sem Verbeek v Francisco Cabral | 7-6,6-3 |
| Challenger Porto | 2021/06/27 13:10 | Mukund Sasikumar v Sem Verbeek | 6-3,3-6,5-7 |
| Challenger Prostejov | 2021/06/13 09:00 | David Poljak v Sem Verbeek | 6-3,6-3 |
| ITF M15 Alkmaar | 2020/08/27 09:00 | Sem Verbeek v Clement Geens | 2-6,0-6 |
| ITF M15 Alkmaar | 2020/08/24 13:00 | Valentin Royer v Sem Verbeek | 5-7,6-4,7-10 |
| ITF M15 Alkmaar | 2020/08/24 08:00 | Lodewijk Weststrate v Sem Verbeek | 4-6,2-6 |
| Challenger Indian Wells | 2020/03/04 18:00 | Sem Verbeek v Jannik Sinner | 0-6,1-6 |
| ITF M15 Huy | 2021/08/22 15:50 | Thorsten Sollie v Jurriaan Bol | 3-6,6-2,10-2 |