"I think that in the third period we did a great job of taking the play to them, more than we did in the first two," Tkachuk said. "You never want to be down going into the third again. But again, we seem to find ourselves ... play in the offensive zone a little more, get more chances, more zone time. That comes with them protecting the lead, too, but I thought we did a pretty good job of getting that point."
Barbashev put St. Louis up 1-0 at 3:17 of the first period when he tucked in a loose puck at the side of the net.
O'Reilly scored on the power play to make it 2-0 at 13:06 of the second period when he one-timed a pass from Perron.
"We have a chance to win every game," O'Reilly said. "Last year is behind us. Winning is fun and we're finding ways to do it."