Mayer seized the lead from Norwegian defending champion Kjetil Jansrud with a blistering descent of 1min 24.44sec. Switzerlands Beat Feuz took silver, 0.13sec adrift, while Jansrud had to settle for bronze.
The Sochi 2014 downhill winner Mayer trumps his father, Helmut, who won super-G silver in 1988, and emerges victorious just three days after he ploughed into bystanders during the combined event.
Norwegian skiers had won five of the eight previous Olympic super-G races, including the last four, and appeared to have locked up another victory when Jansrud bombed down in 1.24:62.
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