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Patrice Bergeron notches 8th career hat trick in Bruins' win (1:19)

The Bruins blanked the Sabres. There is a time and a place for it.

3:36 PM ET

Bruce Cassidy wasn't good enough to keep his job as the Boston Bruins' coach. Don Sweeney was given an extension.

Six weeks after they lost in the first round of the playoffs, the Bruins signed Sweeney to a multiyear extension.

The Boston Bruins have been one of the winningest teams in the league under his management. I'm confident that Don's commitment to being best-in-class on and off the ice will help us climb that mountain again, even though we recognize there is work to be done to achieve the ultimate goal of bringing the Stanley Cup back to Boston.

The Bruins had the best record in the league the next year and had at least 100 points in four of the past five seasons.

Cassidy was terminated on June 6. The Bruins are without a coach, while the Golden Knights have a Jack Adams Award winner as their coach.

In each of the past six seasons, the Bruins have reached the playoffs, according to a release.

The president of the team said that was attributed to Sweeney.

He has seen firsthand his work ethic when it comes to all aspects of front office management. He's committed to giving the Boston Bruins the best chance to win.

The Boston Bruins have lost in the first or second round of the playoffs in each of the last three seasons and are in an Atlantic Division where they have to face the Presidents' Trophy winners this season.

Sweeney is fourth on the Bruins' all-time list for games played and ranks in the top 10 for assists and points by a defenseman. He joined the team's front office in 2006 and moved up the ranks before being promoted to general manager in 2015.

The AP contributed.