Stadium: Court 2 Round: 54 Ground: Hardcourt indoor
| ITF - M15 Oberhaching | 2020/02/16 15:00 | Christoph Negritu v Kai Lemstra | 7-6,6-1 |
| ITF - M15 Oberhaching | 2020/02/16 10:30 | Kai Lemstra v Langmajer, Dominik | 6-1,6-0 |
| Barnstaple, Singles Qualifying M-ITF-GBR-01A | 2020/02/09 14:30 | Kai Lemstra v Patten, Henry | 5-7,2-6 |
| ITF - M15 Sharm El Sheikh | 2019/11/14 08:00 | Manafov, Vladyslav 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 | Dobry, Martin v Kai Lemstra | 3-6,3-6 |
| ITF - M15 Sharm El Sheikh | 2019/10/29 08:00 | Kiyamov, Timur v Kai Lemstra | 6-3,7-6 |
| ITF - M15 Sharm El Sheikh | 2020/02/19 14:10 | Hunter, Vaughn v Matuszewski, Piotr | 6-1,6-4 |
| ITF - M15 Sharm El Sheikh | 2020/02/18 08:00 | Moerani Bouzige v Matuszewski, Piotr | 2-6,7-6,8-10 |
| ITF - M15 Sharm El Sheikh | 2020/02/17 10:00 | Malesevic, Nemanja v Matuszewski, Piotr | 4-6,4-6 |
| ITF - M15 Sharm El Sheikh | 2020/02/11 08:00 | Oleksandr Ovcharenko v Matuszewski, Piotr | 6-3,6-3 |
| ITF - M15 Sharm El Sheikh | 2020/02/10 08:00 | Bronka, Adam v Matuszewski, Piotr | 2-6,2-6 |
| ITF - M15 Sharm El Sheikh | 2020/02/09 08:00 | Matuszewski, Piotr v Johansson, Niklas | 6-3,6-4 |
| ITF M15 Cairo | 2019/11/27 10:35 | Daniel Michalski v Matuszewski, Piotr | 6-1,6-3 |
| ITF M15 Cairo | 2019/11/26 08:00 | Matuszewski, Piotr v Crespi, Nicolo | 6-3,6-0 |