Max Comtois (Anaheim Ducks), Brett Leason and Alexis Lafreniere scored in the first period to help Canada to a 5-1 victory against the Czech Republic in Group A at Rogers Arena in Vancouver on Saturday.
MacKenzie Entwistle (Chicago Blackhawks) and Morgan Frost (Philadelphia Flyers) also scored, and Michael DiPietro (Vancouver Canucks) made 23 saves for Canada (3-0-0-0), which leads the group.
Canada got one goal from its top line and two from the fourth line.
"To win games you have to get scoring through the lineup because your number one line and your number two line aren't going to score every night," Canada coach Tim Hunter said. "It's like a playoff series: if you expect your top line to score every night in a playoff series, good luck."
Ondrej Machala, who is eligible for the 2019 NHL Draft, scored for the Czech Republic (0-1-0-2), which is fourth in Group A. Jiri Patera (Vegas Golden Knights) stopped 16 of 20 shots before being pulled after two periods. Jakub Skarek (New York Islanders) made nine saves in relief.
Canada scored 14 goals in a win against Denmark on Wednesday and defeated Switzerland 3-2 on Thursday. The victory against the Czech Republic had a bit of both games.
"We're not putting up 14 goals but being stronger in little areas, being stronger on the boards, our breakouts are better, our forecheck's better, having high support, being consistent at that too," DiPietro said. "Just the way we're playing, the makeup of our team. We're playing to our identity and the offense is going to come."
Comtois, Canada's only returning player from the 2018 gold-medal-winning team, made it 1-0 at 6:03 of the first period after a blind back pass from Owen Tippett (Florida Panthers).
Machala, 19, tied it 1-1 on a 2-on-1 at 6:40, but Leason gave Canada a 2-1 lead on a power play at 11:32. Leason, 19, was passed over the past two drafts but is a B-rated skater for the 2019 draft by NHL Central Scouting in its November players to watch list.
Lafreniere, the first 17-year-old since Connor McDavid in 2015 to play for Canada, made it 3-1 with a one-timer from the left face-off dot at 16:39.
Entwistle scored for a third straight game to make it 4-1 at 14:41 of the second period, and Frost scored his fourth goal on a power play for a 5-1 lead at 9:01 of the third. Frost also had an assist and leads the tournament with seven points.