Prior to that point, it was a game of singles with Canada stealing points in the first and fourth ends, as both teams struggled to make shots. Canada led 3-1 after four ends.
"It was a big steal to score. Kind of got away with one, I'm still figuring out my first rock a little bit," Lawes said.
Finland grabbed a single in the fifth to pull to 3-2, before Lawes' shot blew the game wide open, and ultimately sealed Canada's win.
"I think the key in that one was patience," Morris said on the tight game before Canada's five-ender.
"Those Fins, they're sneaky good. They don't make every shot but they make some interesting ones and they make the ones that count."
It was the third win in 24 hours for Canada, coming off a 6-4 victory over the United States, and beating China 10-4 earlier in the day.
Click the video player below for highlights from Canada's win over Finland:
Canada will face Switzerland next, which also sits at 3-1 in round-robin play — both teams are in a four-way tie atop the standings — and is coming off its first loss Friday against Norway. With the game at 9 a.m. local time, Morris and Lawes said they'll be skipping the opening ceremonies, watching it at Canada House instead.
Swiss stuns U.S. with historic six-ender for the win
Over on the other sheet in Draw 4, Switzerland trailed the United States by one going into the final end.
But with the hammer and already sitting shot rock, Switzerland's Jenny Perret took out the Americans' lone stone in the house, scoring a perfect six-ender — a rarity in curling.
According to the World Curling Federation, no curling team has ever managed a perfect end at the Olympics.
Mixed curling is making its debut at the Olympics, and the basics are relatively simple.
Each team consists of only two players — one man, one woman instead of the usual teams of four players of the same gender.
Each team throws five stones per end, with the player delivering the team's first stone of the end also delivering the team's final stone of the end. One stone per team is pre-positioned before the start of play in each end.