The 22-year-old first reeled in reigning champion and world record holder Kristof Milak of Hungary to win the 200m butterfly title and, less than two hours later, returned to the pool to cruise to victory in the 200m breaststroke and secure his third gold of the Games.
No-one had previously completed the men's 200m butterfly-breaststroke double and Marchand won both in Olympic-record times.
He became the first swimmer to win two individual golds in one night at the Olympics since 1976, the poster boy of these Games cemented himself as a global superstar of the sport.
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