Stadium: Court 03 Round: 26 Ground: Clay
| ITF M15 Sharm El Sheikh | 2021/11/19 09:25 | Sebastian Prechtel v Peter Fajta | 3-6,1-6 |
| ITF M15 Sharm El Sheikh | 2021/11/18 08:00 | Sebastian Prechtel v Tsung-Hao Huang | 6-3,2-6,6-3 |
| ITF M15 Sharm El Sheikh | 2021/11/17 11:15 | Sebastian Prechtel v Karlo Cubelic | 6-4,6-4 |
| ITF M15 Sharm El Sheikh | 2021/11/11 09:25 | Sebastian Prechtel v Saba Purtseladze | 5-7,3-6 |
| ITF M15 Sharm El Sheikh | 2021/11/10 11:55 | Oleksandr Ovcharenko v Sebastian Prechtel | 6-3,4-6,4-6 |
| ITF M15 Sharm El Sheikh | 2021/11/03 13:30 | Sebastian Prechtel v Nam Hoang Ly | 7-5,4-6,1-6 |
| ITF M15 Selva Gardena | 2021/10/26 14:30 | Sebastian Prechtel v Mick Veldheer | 5-7,4-6 |
| ITF M15 Sozopol | 2021/10/13 15:35 | Sebastian Prechtel v Marko Tepavac | 0-6,3-6 |
| UTR Pro Tennis Series Dubai | 2022/01/10 04:30 | Dan Alexandru Tomescu v Kai Lemstra | 2-6,4-6 |
| UTR Pro Tennis Series Dubai | 2022/01/07 04:30 | Michael Zhu v Kai Lemstra | 7-6,6-2 |
| UTR Pro Tennis Series Dubai | 2022/01/06 06:00 | David Pichler v Kai Lemstra | 6-4,4-6,4-6 |
| UTR Pro Tennis Series Dubai | 2022/01/05 07:30 | Mircea-Alexandru Jecan v Kai Lemstra | 6-4,7-5 |
| UTR Pro Tennis Series Dubai | 2022/01/03 10:50 | Jonathan Eysseric v Kai Lemstra | 6-3,6-1 |
| German Championship | 2021/12/07 15:00 | Kai Lemstra v Tom Schonenberg | 3-6,0-6 |
| ITF M15 Heraklion | 2021/11/23 07:00 | Nicholas David Ionel v Kai Lemstra | 3-6,7-5,10-4 |
| ITF M15 Heraklion | 2021/11/22 08:00 | Sergis Kyratzis v Kai Lemstra | 4-6,2-6 |