Marchment pushed it to 3-1 with a power-play goal 28 seconds into the third period, beating Daccord with a wrist shot from the right face-off dot off a cross-crease feed from Matt Duchene.
“I saw ‘Dutch’ coming out of the corner with it, so I just tried to back into some space,” Marchment said. “It kind of trickled through to me, and the goalie was kind of deep, so I just tried to get a low one on net.”
Johnston scored his 11th goal in his past 13 games to make it 4-1 at 12:56, racing past defenseman Adam Larsson to create a partial breakaway, deking to his left and lifting it over the right pad of Daccord.
“Wyatt Johnston, another big, big goal, making it look easy, so [there are] some good things happening,” Dallas coach Pete DeBoer said.
Rantanen added an empty-net goal for the 5-1 final at 16:26.
NOTES: The Stars joined the Jets and Washington Capitals as the third team to clinch a berth into the 2025 Stanley Cup Playoffs. It will mark their 37th postseason appearance in franchise history. … Johnston’s four-game goal streak is the fourth such run of his career. He joins Steven Stamkos (nine), Alex Ovechkin (six), Patrik Laine (five) and Sidney Crosby (four) as the only active players with as many such streaks age 21 or younger.