Stadium: Hard 21 Round: 62 Ground: Hardcourt outdoor
| ITF M25 Portimao | 2021/10/25 11:55 | Paulo Knippling v Jaime Faria | 3-6,2-6 |
| ITF M25 Loule | 2021/10/10 12:00 | Paulo Knippling v Keanu Elias Immler | 4-6,2-6 |
| ITF M25 Sintra | 2021/09/15 11:55 | Santiago Rodriguez Taverna v Paulo Knippling | 6-0,6-0 |
| ITF M25 Sintra | 2021/09/08 12:45 | Jesse Flores v Paulo Knippling | 6-1,6-1 |
| ITF M15 Oldenzaal | 2021/08/15 14:00 | Guy Den Heijer v Paulo Knippling | 6-3,6-4 |
| ITF M15 Monastir | 2021/07/26 09:00 | Drew Baird v Paulo Knippling | 6-1,6-3 |
| ITF M15 Antalya | 2021/05/30 07:30 | Paulo Knippling v Daniil Savelev | 3-6,1-6 |
| ITF M15 Troisdorf | 2021/05/10 12:30 | Dominik Boehler v Paulo Knippling | 6-0,6-2 |
| ITF M25 Hamburg | 2021/10/17 11:30 | Yannik Steinegger v Christopher Patzanovsky | 6-3,7-6 |
| ITF M25 Budapest | 2021/09/28 09:40 | Buvaysar Gadamauri v Christopher Patzanovsky | 6-1,6-2 |
| ITF M25 Budapest | 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 Prostejov | 2021/08/17 07:55 | Marek Gengel v Christopher Patzanovsky | 6-2,6-0 |
| ITF M25 Prostejov | 2021/08/16 09:40 | Christopher Patzanovsky v Vojtech Mares | 6-2,6-0 |
| ITF M25 Prostejov | 2021/08/15 09:00 | Christopher Patzanovsky v Peter Samosi | 6-0,6-1 |