Silver in the men's competition went to Sangkyum Kim of Korea and Tervel Zamfirov of Bulgaria earned bronze in a photo finish.
For the women, Sabine Payer of Austria claimed silver and Italy's Lucia Dalmasso earned bronze in the women's event.
Two-time champion Ester Ledecka lost to Payer in the quarter-finals. The 30-year-old was the first female to win gold in two different Winter Olympic sports at Pyeongchang 2018 when she prevailed in the snowboarding parallel giant slalom and the skiing Super-G.
The versatile Czech athlete had to choose between the two events in Milan due to a scheduling clash, opting for snowboarding over the downhill races.