Alex Tuch scored two goals for the Golden Knights, who are the No. 2 seed in the Honda West Division.
Fleury made 63 saves on 65 shots in the first two games of the series, including a 1-0 overtime loss in Game 1 on Sunday.
"Guys have been great at letting me see the puck. And when I don't, most of the time they block it," he said. "I thought our defensemen have done a good job with that, and it certainly helps me a lot."
Mathew Dumba scored for the Wild, the No. 3 seed. Cam Talbot made 25 saves after making 42 for the shutout in Game 1.
"We're not proving anything to ourselves. We know the level that we can play at," Dumba said. "I think it's more you guys, the media, putting us as underdogs, and you're going to see a totally different team even at home. We're a different beast."