Third place went to Frida Hansdotter of Sweden, who climbed from fifth after her first run to finish 1.75 seconds adrift of runaway victor Shiffrin. The skiing was solid, really strong actually, so I knew it was fast, I just didn't know how fast compared to the other girls. It was her third world win on the trot after previous victories in 2015 and 2013.
At just 21, Mikaela Shiffrin has already achieved more than most professional skiers do in a lifetime.
On Thursday, she became the first American woman since 2005 to medal in giant slalom when she clinched silver behind victor Tessa Worley of France.
"It put a little bit more pressure on the giant slalom and slalom but at the end of the day it paid off". The host Swiss team leads with six medals, three of them gold.
Mikaela Shiffrin has been racking up historic achievements since she was a teenager - including becoming the youngest Olympic slalom champion at the 2014 Sochi Games when she was 18 - and she added some more glitter on Saturday at the world championships in St. Moritz, Switzerland.
"People tell me about records and history and I'm starting to realize it's awesome, especially for ski racing in the US".
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"To be honest, I don't really know what that means yet", Shiffrin said (via the Denver Post).
In Sunday's downhill, the 24-year-old Italian needed an agile recovery to finish but was still 0.07 behind Vonn in fourth. "... I'm just trying to focus on giant slalom and slalom and see what happens".
Worley, the 2013 champion, finished 0.34 seconds ahead of Shiffrin, who was fastest in the second run as warm sunshine softened the snow.
"I think about [becoming the overall World Cup champion] and it's a dream to win, but I'm not expecting to win this year", Shiffrin told the Denver Post last month.
Still, the World Cup finals week races in Aspen, Colorado, next month will be nearly certainly another Shiffrin coronation.
The last Italian to earn a medal in a World Championship giant slalom was Federica Brignone, who was second in the 2011 World Championship. Both her medals were won after Swiss star Lara Gut crashed out of the championships with a serious knee injury.