Rask, playing this deep in the postseason for the first time, proved equal to the challenge.
Pittsburgh came in averaging a league-high 4.27 goals in the playoffs but couldn't solve Rask.
Tim Thomas was in goal then, and Rask's playoff memories aren't quite so fond.
Boston's Tuukka Rask, a more aggressive goalie than Lundqvist, also has been outstanding in the playoffs.
"In a perfect world I'm pushing side-to-side, but things happen quick sometimes, " Rask said.
Cizikas tied the score at 15:49 of the first when he jammed a rebound past Rask.
Rask: Mobile is the only medium where you can map a full path to purchase.
FORBES: How Retailers Can Benefit From Consumer 'Showrooming'
Since Boston trailed 4-1 in Game 7 against Toronto, Rask has allowed five goals in four-plus games.
The Rangers picked up their play and built a 6-1 edge in shots, including scoring opportunities on Rask.
Rask returned for the Bruins after sitting out Monday night's win, the first game he missed this season.
McDonagh's rising slap shot soared over the right arm of goalie Tuukka Rask.
Josh Bailey raced down the right side and swooped in front of Rask, backhanding a shot toward the goalie.
Thomas' absence has created an opportunity for Tuukka Rask to lead the talented Bruins in net, and he's delivered.
"You have to be pretty happy with the situation right now, " said Tuukka Rask, who made 23 saves for Boston.
Stepan then made it 2-1 on a 30-foot shot from the slot through Rask's legs, two goals in 15.3 seconds.
Rask stuck out his right pad to make the save, leaving the NHL's leading scorer to flash a wry grin.
Stepan stole the puck at center ice and snapped a shot past Rask to make it 2-0 in the second.
Travis Zajac crossed in front of Rask, screening the shot that went in the upper right corner of the net.
Rask: If showrooming is only about price comparison, then apparel and furniture are probably the most likely to be affected.
FORBES: How Retailers Can Benefit From Consumer 'Showrooming'
Rask: Every brand, from Starbucks to Best Buy, will have fiercely loyal enthusiasts that will install their apps.
FORBES: How Retailers Can Benefit From Consumer 'Showrooming'
Rask made sure there wouldn't be another collapse, stopping Ryan Callahan on a breakaway with just under 10 minutes to play.
Callahan split the defense and went to his backhand, but Rask turned it away with the blocker on his right arm.
Meanwhile, Rask flashed the glove to steal away a sure goal from Phanuef in the dying seconds of the second period.
But Rask gloved it after stopping it with his chest while Krejci was in the penalty box for interfering with Hedberg.
Tuukka Rask made 26 saves for the Bruins, who have three losses this season and two of them are to the Rangers.
Rask is 6-1-1 with a 1.97 goals-against average for Boston, the top team in the Eastern Conference as play began on Thursday.
With a two-goal lead, the Bruins remained aggressive but still clogged the middle in front of goalie Tuukka Rask when the Rangers attacked.
That lead lasted less than a minute as Nash scored at 3:20 with a 10-foot shot from the slot over Rask's right shoulder.
"This was a great win but I think we can still play better, " said Rask, who made 36 saves for the surging Bruins.
But Marchand put the puck between goalie Johan Hedberg's pads and the Bruins won when Marek Zidlicky's shot hit Tuukka Rask's left pad.
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