Qualified teams
| Group | Winners | Runners-up |
|---|---|---|
| A |  China |  Thailand |
| B |  South Korea |  Chinese Taipei |
| C |  Indonesia |  Denmark |
| D |  Japan |  Malaysia |
The 2021 Sudirman Cup knockout stage was held at the Energia Areena in Vantaa, Finland, from 1 to 3 October 2021.
The knockout stage was the second and final stage of the competition, following the group stage. It began with the quarter-finals (1 October), followed by the semi-finals (2 October), and the final (3 October). The two highest-finished teams in 4 groups (8 teams in total) qualified to the knockout stage. [1]
| Group | Winners | Runners-up |
|---|---|---|
| A | China | Thailand |
| B | South Korea | Chinese Taipei |
| C | Indonesia | Denmark |
| D | Japan | Malaysia |
The draw was held on 30 September 2021, after the Japan against Malaysia tie. The group runners-up were drawn against the group winners. Teams from the same group cannot be drawn against each other.
| Quarter-finals | Semi-finals | Final | ||||||||
| China | 3 | |||||||||
| Denmark | 2 | |||||||||
| China | 3 | |||||||||
| South Korea | 0 | |||||||||
| South Korea | 3 | |||||||||
| Thailand | 2 | |||||||||
| China | 3 | |||||||||
| Japan | 1 | |||||||||
| Malaysia | 3 | |||||||||
| Indonesia | 2 | |||||||||
| Malaysia | 1 | |||||||||
| Japan | 3 | |||||||||
| Chinese Taipei | 1 | |||||||||
| Japan | 3 | |||||||||
 China 3 | Energia Areena Court 1 1 October 2021, 10:00 UTC+3 [2] |  Denmark 2 | ||||||||||||||||||||||||||||||||||||||||||||
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 South Korea 3 | Energia Areena Court 2 1 October 2021, 10:00 UTC+3 [3] |  Thailand 2 | ||||||||||||||||||||||||||||||||||||||||||||
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 Malaysia 3 | Energia Areena Court 2 1 October 2021, 16:00 UTC+3 [4] |  Indonesia 2 | ||||||||||||||||||||||||||||||||||||||||||||
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 Chinese Taipei 1 | Energia Areena Court 1 1 October 2021, 16:00 UTC+3 [5] |  Japan 3 | ||||||||||||||||||||||||||||||||||||||||||||
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China 3 | Energia Areena Court 1 2 October 2021, 10:00 UTC+3 [6] | South Korea 0 | ||||||||||||||||||||||||||||||||||||||||||||
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Malaysia 1 | Energia Areena Court 1 2 October 2021, 16:00 UTC+3 [7] | Japan 3 | ||||||||||||||||||||||||||||||||||||||||||||
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China 3 | Energia Areena Court 1 3 October 2021, 13:00 UTC+3 [8] | Japan 1 | ||||||||||||||||||||||||||||||||||||||||||||
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