The defending champion notched a score of 24.70 with a clean run down the 247 metres course to top the leaderboard and join compatriot and world champion Mikael Kingsbury, who earlier scored a 23.81 for second place.
Dale Begg-Smith, gold medallist in Turin in 2006 and silver medallist behind Bilodeau in Vancouver, failed to get through, however, making a mistake in the first round and falling face down into the snow on his second run.
The Australian, who returned to competition last year after a three-year sabbatical, was one of several skiers to fall under the Extreme Park lights as they pushed for a place in the final, which takes place under the lights later on Monday.
(Reporting by Nick Mulvenney, editing by Peter Rutherford)
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