| Orleans Masters | 03/21 17:00 | 4 | Kai Schaefer v Mark Caljouw | L | 0-2 | |
| Orleans Masters | 03/20 08:40 | 5 | Kai Schaefer v Teck Zhi Soo | W | 2-0 | |
| Orleans Masters | 03/19 18:00 | 6 | Sam Parsons v Kai Schaefer | W | 0-2 | |
| Swiss Open WD Qual | 03/12 11:00 | - | Kai Schaefer v Felix Burestedt | L | 1-2 | |
| Spain Masters | 02/20 15:20 | 5 |
Pablo Abian
v
Kai Schaefer |
L | 2-0 | |
| Swiss Open WD Qual | 02/19 13:55 | - | Kim Bruun v Kai Schaefer | W | 1-2 | |
| Swiss Open WD Qual | 02/19 11:00 | - | Kai Schaefer v Bernat Amaya | W | 2-0 | |
| Giraldilla Int. XD | 02/16 10:30 | - | Kai Schaefer v Vladimir Malkov | L | 1-2 | |
| Giraldilla Int. XD | 02/15 13:30 | - | Rajiv Ouseph v Kai Schaefer | W | 0-2 | |
| Giraldilla Int. XD | 11/30 11:45 | 1 | Alex Lane v Kai Schaefer | L | 2-0 | |
| Giraldilla Int. XD | 11/29 13:30 | 1 |
Joran Kweekel
v
Kai Schaefer |
W | 1-2 | |
| Giraldilla Int. XD | 11/23 11:20 | 4 | Mark Caljouw v Kai Schaefer | L | 2-0 | |
| Giraldilla Int. XD | 11/22 13:20 | 5 |
Christo Popov
v
Kai Schaefer |
W | 1-2 | |
| Giraldilla Int. XD | 11/21 18:00 | 6 | Joshua Magee v Kai Schaefer | W | 1-2 | |
| Giraldilla Int. XD | 10/31 16:20 | 5 | Kai Schaefer v Mark Caljouw | L | 0-2 | |
| Giraldilla Int. XD | 10/30 18:45 | 6 | David Kramer v Kai Schaefer | W | 0-2 | |
| Giraldilla Int. XD | 09/28 08:30 | 1 |
Kai Schaefer v
Subhankar Dey
|
L | 1-2 | |
| Polish Int. | 09/23 14:00 | 1 |
Harsheel Dani
v
Kai Schaefer |
W | 1-2 | |
| Polish Int. | 09/23 09:20 | 1 | Iikka Heino v Kai Schaefer | W | 0-2 | |
| Polish Int. | 09/22 12:00 | 1 | Rasmus Messerschmidt v Kai Schaefer | W | 0-2 | |
| Giraldilla Int. XD | 08/29 12:50 | 5 | Yu Igarashi v Kai Schaefer | L | 2-0 | |
| All England Open | 07/31 09:40 | 6 | Kai Schaefer v Hans-Kristian Vittinghus | L | 1-2 | |
| Swiss Open WD Qual | 07/17 00:55 | - | Kai Schaefer v Firman Abdul Kholik | L | 1-2 | |
| Giraldilla Int. XD | 06/20 19:40 | 5 | Sitthikom Thammasin v Kai Schaefer | L | 2-0 | |
| Giraldilla Int. XD | 06/20 01:00 | 6 | Kevin Cordon v Kai Schaefer | W | 0-2 | |
| US Open | 06/13 23:40 | 5 |
Xiaodong Sheng
v
Kai Schaefer |
L | 2-1 | |
| Indonesia Masters XD | 05/23 03:00 | 1 | Wing Ki Vincent Wong v Kai Schaefer | L | 2-1 | |
| Indonesia Masters XD | 05/22 03:00 | 1 |
Kenta Nishimoto
v
Kai Schaefer |
L | 2-1 | |
| Indonesia Masters XD | 05/20 12:00 | 1 |
Tien Chen Chou
v
Kai Schaefer |
L | 2-0 | |
| Indonesia Masters XD | 04/24 09:00 | 6 | Jacob Nilsson v Kai Schaefer | L | 2-0 |
Wikipedia - Kai Schäfer
Kai Hendrik Schäfer (born 13 June 1993) is a German badminton player. He competed at the 2020 Tokyo Olympics.