Stadium: Hard 21 Round: 26 Ground: Hardcourt outdoor
| ITF Germany F7 | 2018/07/09 08:00 | Kai Lemstra v Tim Handel | 4-6,7-5,6-1 |
| ITF M15 Selva Gardena | 2021/10/29 14:00 | Leandro Riedi v Tim Handel | 4-6,6-3,6-4 |
| ITF M15 Selva Gardena | 2021/10/28 12:20 | Tim Handel v Giacomo Dambrosi | 7-6,4-6,6-3 |
| ITF M15 Selva Gardena | 2021/10/27 14:05 | Tim Handel v Luigi Sorrentino | 6-2,6-2 |
| ITF M15 Selva Gardena | 2021/10/25 13:05 | Tim Handel v Alessandro Ragazzi | 7-5,6-2 |
| ITF M25 Hamburg | 2021/10/20 12:30 | Elmar Ejupovic v Tim Handel | 6-4,4-6,7-6 |
| ITF M15 Sozopol | 2021/10/14 12:30 | Tim Handel v Nikolay Nedelchev | 3-6,6-7 |
| ITF M15 Sozopol | 2021/10/08 08:35 | Tim Handel v Alexander Donski | 3-6,6-3,2-6 |
| ITF M15 Sozopol | 2021/10/07 07:00 | Tim Handel v Simon A Ivanov | 7-5,6-2 |
| ITF M15 Heraklion | 2021/11/10 09:20 | Karlis Ozolins v Kai Lemstra | 3-6,6-7 |
| ITF M15 Heraklion | 2021/11/09 07:00 | Kai Lemstra v Christopher Patzanovsky | 6-2,6-4 |
| ITF M15 Heraklion | 2021/11/07 12:00 | Kai Lemstra v Drew Van Orderlain | 6-2,6-3 |
| ITF M15 Selva Gardena | 2021/10/27 08:00 | Kai Lemstra v Mattia Bellucci | 3-6,3-6 |
| ITF M15 Selva Gardena | 2021/10/26 07:30 | Kai Lemstra v Carlo Alberto Fossati | 6-4,7-5 |
| ITF M15 Selva Gardena | 2021/10/25 08:30 | Kai Lemstra v Dominique Graf | 7-5,6-2 |
| ITF M15 Selva Gardena | 2021/10/24 10:45 | Kai Lemstra v Davide Ferrarolli | 6-4,6-3 |
| ITF M25 Hamburg | 2021/10/17 07:55 | Tom Schonenberg v Kai Lemstra | 6-2,6-2 |