| UTR Pro Tennis Series Amsterdam | 2021/12/11 11:30 | Sandkaulen, Tim v Nathan De Veer | 6-1,5-1 |
| UTR Pro Tennis Series Amsterdam | 2021/12/10 07:00 | Sandkaulen, Tim v Eisinga, Zachary | 6-1,6-7,7-5 |
| UTR Pro Tennis Series Amsterdam | 2021/12/08 07:00 | Sandkaulen, Tim v Jurriaan Bol | 4-6,7-5,6-4 |
| UTR Pro Tennis Series Amsterdam | 2021/12/07 08:30 | Sandkaulen, Tim v Tibo Colson | 6-4,2-6,4-6 |
| UTR Pro Tennis Series Amsterdam | 2021/12/06 11:30 | Verbeek, Sem v Sandkaulen, Tim | 5-7,6-7 |
| ITF M25 Hamburg | 2021/10/21 08:00 | Hampel, Lenny v Sandkaulen, Tim | 6-4,7-6 |
| ITF M25 Hamburg | 2021/10/19 08:00 | Sandkaulen, Tim v Marvin Moeller | 6-4,7-5 |
| ITF M25 Hamburg | 2021/10/17 14:50 | Dhoe, Benjamin v Sandkaulen, Tim | 6-7,6-2,5-10 |
| UTR Pro Tennis Series Amsterdam | 2021/12/11 11:30 | Admiraal, Amadatus v Michiel de Krom | 3-6,4-5 |
| UTR Pro Tennis Series Amsterdam | 2021/12/10 08:30 | Michiel de Krom v van Nunen, Max | 6-1,6-1 |
| UTR Pro Tennis Series Amsterdam | 2021/12/08 10:00 | Michiel de Krom v Guy Den Heijer | 3-6,3-5 |
| UTR Pro Tennis Series Amsterdam | 2021/12/07 08:30 | Michiel de Krom v Rob Van Den Berg | 5-7,6-3,5-2 |
| UTR Pro Tennis Series Amsterdam | 2021/12/06 07:00 | Jip Van Assendelft v Michiel de Krom | 2-6,6-2,1-6 |
| UTR Pro Tennis Series Barcelona | 2021/11/28 09:30 | Michiel de Krom v Vlad Cristian Breazu | 6-1,4-6,6-1 |
| UTR Pro Tennis Series Barcelona | 2021/11/27 11:00 | Michiel de Krom v Alvaro Bueno Gil | 6-4,6-3 |
| UTR Pro Tennis Series Barcelona | 2021/11/26 09:30 | Michiel de Krom v Uzhylovsky, Vladimir | 6-0,6-2 |