Armand Marchant finished a surprise second, 0.07 slower over the two legs, to celebrate a first ever World Cup podium for Belgium.
Norway's Atle Lie McGrath, leader after the first run, had to settle for third.
Lucas Pinheiro Braathen, the Norwegian-born skier who competes for Brazil and won the opening slalom in Levi in a first for his country, could manage only 10th.