John Naber of the United States in a time of 55.49 seconds, at the time a world record.
Naber won 5 medals (4 gold, 1 silver) at the 1976 Games in Montreal. He also won gold in 200 meter backstroke, 4x200 meter freestyle relay, and 4x100 meter medley relay. He won silver in 200 meter freestyle.
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