The Boston rallied from a two-goal deficit to beat the St. Louis Blues 4-2 in Game 1 of the Stanley Cup Finals on Monday night.
Sean Kuraly scored to break a third-period tie and assisted on another goal, and Tuukka Rask stopped 18 shots to help the Bruins complete their comeback from a two-goal deficit.
Brad Marchand added an empty netter with about three minutes left, but the unofficial clincher came when Krug got up off the ice after losing his helmet in a tussle with David Perron in front of the Boston net.
Jordan Binnington made 34 saves for the Blues, who haven't been back to the final since getting swept by Boston in 1970. But it was Boston which was struggling with a long layoff - at least early on.
Brayden Schenn made it 1-0 lead midway through the first period on a third-chance shot. In the first minute of the second, David Pastrnak got sloppy behind the Bruins' net and Schenn was there again, this time to pass it to Vladimir Tarasenko in the slot to make it 2-0.
Game 2 in the best-of-seven series is Wednesday night.