| UTR Pro Tennis Series Amsterdam | 2021/12/06 11:30 | Verbeek, Sem v Sandkaulen, Tim | 5-7,6-7 |
| UTR Pro Tennis Series Amsterdam | 2021/11/07 10:30 | Guy Den Heijer v Verbeek, Sem | 6-3,6-3 |
| UTR Pro Tennis Series Amsterdam | 2021/11/06 13:30 | Sollie, Thorsten v Verbeek, Sem | 6-4,4-6,5-7 |
| UTR Pro Tennis Series Amsterdam | 2021/11/05 10:30 | Verbeek, Sem v Minakov, Mikhail | 6-2,6-3 |
| UTR Pro Tennis Series Amsterdam | 2021/11/03 12:00 | Verbeek, Sem v Dhoe, Benjamin | 6-3,6-4 |
| UTR Pro Tennis Series Amsterdam | 2021/11/02 13:30 | Verbeek, Sem v Admiraal, Amadatus | 6-2,6-2 |
| UTR Pro Tennis Series Amsterdam | 2021/11/01 10:30 | Clavel, Tom v Verbeek, Sem | 6-2,4-6,4-6 |
| Challenger Porto | 2021/06/29 16:40 | Verbeek, Sem v Gastao Elias | 7-6,4-6,1-6 |
| UTR Pro Tennis Series Amsterdam | 2021/12/06 11:30 | Eisinga, Zachary v Jurriaan Bol | 2-6,6-4,6-1 |
| ITF - M15 Sharm El Sheikh | 2021/11/08 11:30 | Eisinga, Zachary v Louis Allen | 5-7,7-5,8-10 |
| ITF - M15 Sharm El Sheikh | 2021/11/07 17:00 | Eisinga, Zachary v Chornous, Danyil | 6-1,6-2 |
| ITF - M15 Sharm El Sheikh | 2021/11/03 11:30 | Eisinga, Zachary v Recci, Mason | 4-6,4-6 |
| ITF - M15 Sharm El Sheikh | 2021/11/02 07:30 | Eisinga, Zachary v Mubarak, Abdulhamid | 6-2,7-5 |
| ITF - M15 Sharm El Sheikh | 2021/11/01 07:00 | Eisinga, Zachary v Sebastian Sorger | 6-4,6-1 |
| ITF - M15 Sharm El Sheikh | 2021/10/31 08:00 | Eisinga, Zachary v Bogdan Seleznev | 6-3,6-0 |
| ITF M15 Cairo | 2021/09/30 11:45 | Luciano Darderi v Eisinga, Zachary | 6-2,6-0 |