Rookie Dominique Petrie scored the game-winner in the third period and Maddie Rooney stopped 19 of 20 shots as the Minnesota Frost beat the Boston Fleet, 2-1, Wednesday at the Tsongas Center.

It was the first rematch for the teams that participated in the inaugural PWHL Championship Series, which the Frost won in five games.

Michela Cava also scored for the Frost, who bounced back from an overtime loss to New York in their season opener Sunday at Xcel Energy Center.

Hilary Knight scored for the Fleet, deflecting Emily Brown’s point shot over Rooney’s right shoulder to tie the score at 1-1 at 4:01 of the third period.

Cava gave the Frost the lead in the second period when his one-timer jumped about five feet in the air and landed behind Fleet goaltender Aerin Frankel to make it 1-1 at 7:25. Taylor Heise got the first assist with a no-look, on-target pass.

Minnesota took a 2-1 lead when Petrie, a fifth-round pick in this summer’s draft, tipped in a floater from the point by teammate Mellissa Channell-Watkins. The puck hit Petrie’s left arm and past Frankel with 9:22 remaining.

In the lead, the Frosts remained aggressive, especially at the end of the clock. Due to pressure in Boston’s zone, Courtney Kessel was unable to bring Frankel in for an extra attacker until there was just under a minute left in regulation.

The Frost (1-0-1-0) will be in Toronto on Saturday for a 2 p.m. puck drop against last season’s regular season champion.