| 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 - M25 Hamburg | 2021/10/21 08:00 | Lenny Hampel v Tim Sandkaulen | 6-4,7-6 |
| ITF - M25 Hamburg | 2021/10/19 08:00 | Tim Sandkaulen v Marvin Moeller | 6-4,7-5 |
| ITF - M25 Hamburg | 2021/10/17 14:50 | Benjamin Dhoe v Tim Sandkaulen | 6-7,6-2,5-10 |
| ITF - M25 Hamburg | 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 - Mulheim | 2021/10/15 08:30 | Yurii Dzhavakian v Tim Sandkaulen | 0-0 |
| UTR Pro Tennis Series - Amsterdam | 2021/12/06 11:30 | Zachary Eisinga v Jurriaan Bol | 2-6,6-4,6-1 |
| ITF - M15 Heraklion | 2021/11/29 10:00 | Preston Brown v Jurriaan Bol | 6-3,7-6 |
| ITF - M15 Heraklion | 2021/11/28 11:00 | Eduardo Cohen v Jurriaan Bol | 7-5,1-6,6-10 |
| UTR Pro Tennis Series - Mulheim | 2021/09/25 12:01 | Thijmen Loof v Jurriaan Bol | 2-6,3-5 |
| UTR Pro Tennis Series - Mulheim | 2021/09/25 08:30 | Alen Moritz Hodzic v Jurriaan Bol | 2-6,2-6 |
| UTR Pro Tennis Series - Mulheim | 2021/09/24 08:00 | Christos Keisidis v Jurriaan Bol | 1-6,4-6 |
| UTR Pro Tennis Series - Mulheim | 2021/09/23 11:00 | Colin Sinclair v Jurriaan Bol | 6-3,6-3 |
| UTR Pro Tennis Series - Mulheim | 2021/09/22 12:30 | Edison Ambarzumjan v Jurriaan Bol | 6-4,2-6,2-6 |