The decision to stay with the 28-year-old goalie comes on the heels of the Bruins' 5-1 loss in Game 1 on Monday, in which Ullmark allowed four goals on 24 shots in his Stanley Cup Playoffs debut.
"He had a great run coming into the playoffs and we're not going to judge him on one game," Boston coach Bruce Cassidy said Tuesday. "It was his first playoff game. There's a bunch of different things that go into that. But at the end of the day he's going back in and hopefully he's a better goaltender.
"That's how it works this time of year, right? It's a big part of the game and he'll get his chance."
Ullmark was 3-1-0 with a .953 save percentage in his last five regular-season games. For the season he was 26-10-2 with a 2.45 goals-against average, .917 save percentage and one shutout in 41 games.
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He shared the position most of the season with Jeremy Swayman (23-14-3, 2.41 GAA, .914 save percentage, three shutouts, 41 games), a rookie who played one period in relief of Tuukka Rask against the New York Islanders in Game 5 of the Stanley Cup Second Round last season.
"Nothing changes whether it was Linus or Jeremy in net," defenseman Brandon Carlo said. "I think with everything that goes on within a series, no matter what happens, could be injuries, you just have to continue to move forward, so that's the way that we pursue the game. Everybody is trying to pull on the rope the same way so that's all we're really focused on."
In addition to the decision to start Ullmark, Cassidy will shuffle his top two defense pairs.
Charlie McAvoy, who played with Hampus Lindholm on the top pair in Game 1, will start Game 2 alongside Matt Grzelcyk. Lindholm will be paired with Carlo.
McAvoy and Lindholm had been paired since Lindholm was acquired in a trade with the Anaheim Ducks on March 19. They were apart only when Lindholm missed seven games in April because of a lower-body injury.
"I just thought 'Griz' and Carlo had a bit of a challenging night, so we talked about using Lindholm with Carlo at times as well," Cassidy said. "It also allows you to put Lindholm and McAvoy together again in-game, maybe after they've sat a shift. You can still keep them as a pair since they're always together."
Grzelcyk was a minus-3 with two blocked shots and Carlo was minus-2 with two blocks in Game 1. McAvoy led all Boston skaters in ice time (24:08) and had three hits, and Lindholm was second in ice time (22:52) with three blocks.
"We haven't had many shifts or games together, but from watching [Lindholm] along the bench and over the past couple of years he's a guy that I have a lot of respect for in his game, so I feel like I'm pretty familiar with the way he plays the game," Carlo said. "I think the biggest thing for us will be communication and just using our big bodies and long sticks to keep things to the outside."
