| 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 M25 The Hague | 2021/06/27 08:00 | Dax Donders v Zachary Eisinga | 6-2,7-5 |
| ITF M25 Alkmaar | 2021/06/21 14:25 | Guillaume Dermiens v Zachary Eisinga | 4-6,7-5,13-11 |
| ITF M25 Alkmaar | 2021/06/20 12:30 | Lodewijk Weststrate v Zachary Eisinga | 2-6,1-6 |
| ITF M15 Cairo | 2021/05/04 08:00 | Zachary Eisinga v Martin Dimitrov | 1-6,6-7 |
| ITF M15 Cairo | 2021/05/03 08:00 | Zachary Eisinga v Ali Alshati | 3-6,6-0,10-8 |
| ITF M15 Cairo | 2021/04/28 10:00 | Zachary Eisinga v Shintaro Mochizuki | 4-6,2-6 |
| ITF M15 Cairo | 2021/04/19 10:30 | Zachary Eisinga v Fares Zakaria | 2-6,6-3,3-10 |
| ITF M15 Cairo | 2021/04/18 07:00 | Zachary Eisinga v Anton Magnusson | 6-2,4-6,10-2 |