Knud Aage Nielsen
Knud Aage Nielsen ( born 1937 ) is a former Danish badminton player. Poul -Erik Nielsen is his older brother.
Career
Knud Aage Nielsen won the 1958 Norwegian International in men's singles as well as the Belgian International 1959. 1959 he was also Danish champion and he also won at the Dutch Open. In 1964 he won at the All England. In 1967 he married Imre Rietveld.