Stadium: Court 3 Round: 54 Ground: Hardcourt indoor
| ITF M15 Sharm El Sheikh | 2019/11/14 08:00 | Vladyslav Manafov v Kai Lemstra | 6-1,6-2 |
| ITF M15 Sharm El Sheikh | 2019/11/13 08:00 | Tsung-Hao Huang v Kai Lemstra | 6-7,2-6 |
| ITF M15 Sharm El Sheikh | 2019/11/05 08:00 | Kalman Boyd v Kai Lemstra | 7-5,6-4 |
| ITF M15 Sharm El Sheikh | 2019/11/04 08:00 | Martin Dobry v Kai Lemstra | 3-6,3-6 |
| ITF M15 Sharm El Sheikh | 2019/10/29 08:00 | Timur Kiyamov v Kai Lemstra | 6-3,7-6 |
| ITF M15 Sharm El Sheikh | 2019/10/28 09:00 | Daniel Kossek v Kai Lemstra | 1-6,1-6 |
| ITF M15 Bad Salzdetfurth | 2019/10/08 09:00 | Kai Lemstra v Christopher Patzanovsky | 6-7,4-6 |
| ITF M15 Ueberlingen | 2019/08/21 09:55 | Peter Heller v Kai Lemstra | 5-7,6-2,6-2 |
| ITF M25 Shrewsbury | 2019/09/23 11:30 | Llewelyn Bevan v Henry Patten | 2-6,6-3,13-11 |