Tuuka Rask made 28 saves, Brad Marchand had a goal and an assist, and the Bruins beat the St. Louis Blues 5-1 on Sunday night to even the bruising, physical final at three games apiece.
David Pastrnak had one of Boston's four goals in the third period and an assist, helping the Bruins force the 17th Game 7 in Stanley Cup history. Brandon Carlo, Karson Kuhlman and Zdeno Chara also scored.
Ryan O'Reilly scored in the third period for St. Louis, which is looking for the franchise's first Stanley Cup title in its 51st season. Rookie Jordan Binnington finished with 27 stops.
Rask was at his best while Boston killed off four power plays, dropping St. Louis to 1 for 18 with the man advantage for the series. He smothered a big Colton Parayko slap shot with Chara in the box near the end of the first period, and made a fancy glove stop on an even-strength try for Brayden Schenn 7:42 in the second.
He got some help after Marchand was whistled for tripping Alex Pietrangelo midway through the second. With the Blues applying heavy pressure in search of the tying goal, Pietrangelo had a backhand go off the left post and Rask's back before McAvoy knocked the puck out of the way out of midair.
While St. Louis came up empty on the power play, Boston used a 5-on-3 advantage to jump in front in the first. With Schenn and O'Reilly in the box, Marchand beat Binnington with a sharp-angled shot from the right circle at 8:40.
It was Marchand's first goal since he got an empty-netter in Boston's 4-2 victory in Game 1. The Bruins improved to 25-1 when the pesky veteran scores in the postseason.