Knud Aage Nielsen

With a singles game that featured consistency and excellent mobility, Nielsen played at a high international level from the late 1950s through the mid-1960s. In 1964 he won men's singles at the All England Open Badminton Championships, then considered the unofficial World Badminton Championships, narrowly defeating fellow Dane Henning Borch in the final.^[1] He played Thomas Cup (men's international team competition) singles for Denmark in the '60–'61 and '63–'64campaigns, scoring Denmark's only singles victory in its controversial '64 Challenge Round loss to Indonesia.^[2]

He is the younger brother of Poul-Erik Nielsen three times an All England doubles champion.^[3]

Nielsen appeared in the Danish TV series Make badminton great again from 2022 about the history of Danish badminton.^[4]

Men's singles

Year	Tournament	Opponent	Score	Result
1958	Norwegian International			Winner
1959	Dutch Open	Ferry Sonneville	18–13, 15–9	Winner
1964	German Open	Erland Kops	7–15, 13–15	Runner-up
1964	All England	Henning Borch	8–15, 17–15, 15–4	Winner
1966	Dutch Open	Wolfgang Bochow	18–15, 15–9	Winner
1966	German Open	Erland Kops		Runner-up
1966	Denmark Open	Svend Pri	3–15, 9–15	Runner-up

Men's doubles

Year	Tournament	Partner	Opponent	Score	Result
1961	Dutch Open	Ole Mertz	Wong B. K. Yeoh Kean Hua	18–15, 15–9	Winner
1963	Swedish Open	Henning Borch			Winner
1965	Swedish Open	Erland Kops			Winner
1966	Dutch Open	Elo Hansen	Punch Gunalan Oon Chong Hau	4–15, 4–15	Runner-up

Mixed doubles

Year	Tournament	Partner	Opponent	Score	Result
1964	German Open	Kirsten Thorndahl	Finn Kobberø Bente Flindt	9–15, 10–15	Runner-up