The deal is reportedly worth a $7 million cap hit each year and will run through the 2020-21 season, according to the Bruins' official Twitter page and website.
The writing was on the wall for Rask to land a long-term deal with handsome figures after dominating for his team's run to the Stanley Cup Final in 2013. Boston came up short to the Chicago Blackhawks in six games, but Rask was arguably the MVP of the postseason with a .940 save percentage.
This came on the heels of a stellar regular season, where he put up a 2.00 goals against average in 36 games of the lockout-shortened campaign. He notched a 19-10-5 season record and finished fifth in the Vezina Trophy voting, awarded to the NHL's top goaltender.
The signature point of Rask's 2012-13 affair was in a playoff series against the Pittsburgh Penguins, when he gave up just two goals for the entire four-game series against one of the NHL's most potent attacks with Sidney Crosby and Evgeni Malkin.
Rask was on a one-year contract and could test the market as a restricted free agent, but both sides worked out a deal before he could become a realistic target for anyone on the market.
In the wake of Tim Thomas taking a hiatus, Rask was given the chance to step up into the starting role and have a trial run of sorts. It's obvious that the Bruins bought into that trial and are now paying big bucks to keep their rising star in New England.
The Finland native went 21st overall in the 2005 draft to the Toronto Maple Leafs, but he didn't make his NHL debut until the 2007-08 season with the Bruins. He broke out as a formidable starting goaltender after a 2009-10 season when he went 22-12-5.