Estádio: Hard Court 4 Round: 62 Ground: Hardcourt outdoor
| ITF - M15 Bad Salzdetfurth | 2019/10/08 09:00 | Kai Lemstra v Christopher Patzanovsky | 6-7,4-6 |
| 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 Hamburgo | 2021/10/17 07:55 | Tom Schonenberg v Kai Lemstra | 6-2,6-2 |
| ITF - M15 Monastir | 2021/08/26 07:30 | Kai Lemstra v Renta Tokuda | 2-6,2-6 |
| ITF - M15 Monastir | 2021/08/25 07:30 | Hamzeh Al-Aswad v Kai Lemstra | 2-6,1-6 |
| ITF - M15 Heraklion | 2021/11/08 09:00 | Moritz Poswiat v Christopher Patzanovsky | 5-7,6-1,8-10 |
| ITF - M15 Heraklion | 2021/11/07 11:00 | Paulo Knippling v Christopher Patzanovsky | 2-6,2-6 |
| ITF - M25 Hamburgo | 2021/10/17 11:30 | Yannik Steinegger v Christopher Patzanovsky | 6-3,7-6 |
| ITF - M25 Budapeste | 2021/09/28 09:40 | Buvaysar Gadamauri v Christopher Patzanovsky | 6-1,6-2 |
| ITF - M25 Budapeste | 2021/09/27 10:25 | Christopher Patzanovsky v Zalan Sandor Savay | 6-3,6-1 |
| ITF - M25 Pardubice | 2021/09/20 09:00 | Christopher Patzanovsky v Stefanos Sakellaridis | 6-4,1-6,7-10 |
| ITF - M25 Trier | 2021/08/23 08:00 | Fred Olivier Schommer v Christopher Patzanovsky | 7-5,0-6,10-6 |
| ITF - M25 Prostějov | 2021/08/17 07:55 | Marek Gengel v Christopher Patzanovsky | 6-2,6-0 |