| 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 |
| Challenger Braunschweig | 2021/07/05 09:30 | Tim Sandkaulen v Daniel Michalski | 3-6,5-7 |
| Challenger Braunschweig | 2021/07/04 09:00 | Kacper Zuk v Tim Sandkaulen | 6-2,3-6,6-7 |
| ITF USA F25 | 2018/09/15 17:30 | Alan Kohen v Tim Sandkaulen | 6-4,6-4 |
| ITF USA F25 | 2018/09/14 16:00 | Tim Sandkaulen v Robert Kelly | 6-7,6-1,6-0 |
| ITF Germany F9 | 2018/07/23 10:00 | Louroi Martinez v Tim Sandkaulen | 6-0,3-6,6-3 |
| ITF Germany F9 | 2018/07/22 11:00 | Tim Sandkaulen v Torben Steinorth | 6-4,6-1 |
| ITF Germany F9 | 2018/07/22 08:00 | Tim Sandkaulen v Lodewijk Weststrate | 6-2,7-6 |
| Challenger Meerbusch Qual | 2017/08/12 12:10 | Antonio Sancic v Tim Sandkaulen | 7-6,6-1 |