| Euroopa meistrivõistlused | 04/10 17:00 | - | Viktor Axelsen v Kai Schaefer | L | 2-0 | |
| Spain Masters - kval | 03/26 09:45 | 4 | Yushi Tanaka v Kai Schaefer | L | 2-0 | |
| Polish Open | 03/23 15:00 | - | Kai Schaefer v Viktor Ording Kauffman | L | 1-2 | |
| Polish Open | 03/23 15:00 | - | Kai Schaefer v Victor Kauffmann | L | 1-2 | |
| Polish Open | 03/23 09:00 | - | Kalle Koljonen v Kai Schaefer | W | 0-2 | |
| Polish Open | 03/22 14:40 | - | Kai Schaefer v Markus Barth | W | 2-0 | |
| Orleans Masters - kval | 03/12 13:40 | - | Daniil Dubovenko v Kai Schaefer | L | 2-1 | |
| Orleans Masters - kval | 03/12 11:55 | 4 | Kai Schaefer v Danylo Bosniuk | W | 2-0 | |
| Portugali rahvusvah | 03/09 17:20 | - | Matthias Kicklitz v Kai Schaefer | L | 2-0 | |
| Portugali rahvusvah | 03/09 10:40 | - | Kai Schaefer v Rafael Gavois | W | 2-0 | |
| Portugali rahvusvah | 03/08 10:40 | - | Kai Schaefer v Aria Dinata | W | 2-1 | |
| Saksa lahtised meistrivõistlused, kval | 02/27 08:00 | 4 | S. Sankar Muthusamy Subramanian v Kai Schaefer | L | 2-0 |
Kai Hendrik Schäfer (born 13 June 1993) is a German badminton player. He competed at the 2020 Tokyo Olympics.