LAVAL, Quebec (AP) — Susanna Tapani scored in overtime and Aerin Frankel made a league-record 53 saves to lead Boston to a 2-1 win over Montreal in Game 1 of a Professional Women’s Hockey League semifinal series on Thursday night.

“Tremendous,” Boston head coach Courtney Kessel said of her goalie. “Just when you think everyone is beat on the ice, she comes flying across the net.”

Tapani pounced on a loose puck in the blue paint at 14:25 of the extra period for the first overtime goal in PWHL playoff history.

Lexie Adzija scored in regulation for Boston. The visitors entered the best-of-five semifinal with wins in four of their final five games, including a 4-3 victory over Montreal in the final game of the regular season.

Kristin O’Neill scored and Ann-Renée Desbiens stopped 24 shots for Montreal, which finished second in the PWHL regular season and six points ahead of third-place Boston.