| UTR Pro Tennis Series - Amsterdam | 2021/12/08 07:00 | Tim Sandkaulen v Jurriaan Bol | 4-6,7-5,6-4 |
| UTR Pro Tennis Series - Amsterdam | 2021/12/07 08:30 | Tim Sandkaulen v Tibo Colson | 6-4,2-6,4-6 |
| UTR Pro Tennis Series - Amsterdam | 2021/12/06 11:30 | Sem Verbeek v Tim Sandkaulen | 5-7,6-7 |
| ITF - Hamburg M25 | 2021/10/21 08:00 | Lenny Hampel v Tim Sandkaulen | 6-4,7-6 |
| ITF - Hamburg M25 | 2021/10/19 08:00 | Tim Sandkaulen v Marvin Moeller | 6-4,7-5 |
| ITF - Hamburg M25 | 2021/10/17 14:50 | Benjamin Dhoe v Tim Sandkaulen | 6-7,6-2,5-10 |
| ITF - Hamburg M25 | 2021/10/17 11:10 | Alen Moritz Hodzic v Tim Sandkaulen | 6-7,1-6 |
| UTR Pro Tennis Series - Mulheim | 2021/10/16 08:00 | Tim Sandkaulen v Eric Vanshelboim | 0-0 |
| UTR Pro Tennis Series - Amsterdam | 2021/12/09 08:30 | Tibo Colson v Zachary Eisinga | 6-2,6-3 |
| UTR Pro Tennis Series - Amsterdam | 2021/12/07 07:00 | Sem Verbeek v Zachary Eisinga | 6-0,6-1 |
| UTR Pro Tennis Series - Amsterdam | 2021/12/06 11:30 | Zachary Eisinga v Jurriaan Bol | 2-6,6-4,6-1 |
| ITF - Sharm El Sheikh M15 | 2021/11/08 11:30 | Zachary Eisinga v Louis Allen | 5-7,7-5,8-10 |
| ITF - Sharm El Sheikh M15 | 2021/11/07 17:00 | Zachary Eisinga v Danyil Chornous | 6-1,6-2 |
| ITF - Sharm El Sheikh M15 | 2021/11/03 11:30 | Zachary Eisinga v Mason Recci | 4-6,4-6 |
| ITF - Sharm El Sheikh M15 | 2021/11/02 07:30 | Zachary Eisinga v Abdulhamid Mubarak | 6-2,7-5 |
| ITF - Sharm El Sheikh M15 | 2021/11/01 07:00 | Zachary Eisinga v Sebastian Sorger | 6-4,6-1 |