DETROIT -- The Boston Bruins failed to gain ground in the Atlantic Division with a 6-3 loss to the Detroit Red Wings at Little Caesars Arena on Sunday.
Boston (47-23-9), which was defeated for the second straight night after losing 4-1 to the Florida Panthers on Saturday, leads the Toronto Maple Leafs by six points for second place. Jaroslav Halak made 22 saves.
"I thought we were disrespectful to a team that can score and is playing really well, and they made us pay," Bruins coach Bruce Cassidy said. "We'd like to get to a position where we can lock up second place and rest some guys and we're letting that opportunity get away."
[WATCH: All Bruins vs. Red Wings highlights]
Anthony Mantha had an NHL career-high five points, including his first NHL hat trick, and Taro Hirose scored his first NHL goal for Detroit (31-38-10), which has won a season-high five straight games.
"We're having a lot of fun right now," said Mantha, who has 12 points (five goals, seven assists) in a five-game point streak. "It's great to get my first hat trick, but when the puck goes into the net, you are going to be just as excited whether you got a goal or an assist."
Video: BOS@DET: Hirose breaks tie with first NHL goal
Jimmy Howard made 31 saves, and Tyler Bertuzzi had three assists.
"I think the thing that should encourage our fans is that this run is being led by our young core of players who are going to be here for a while," Blashill said. "You've got Mantha, Bertuzzi and [Dylan Larkin] on the first line, and look what they did against Patrice Bergeron's line. And then you've got [Andreas Athanasiou] going against David Krejci's line."
Mantha gave the Red Wings a 1-0 lead at 10:26 of the first period on a one-timer off a cross-ice backhand pass from Larkin. He made it 2-0 with one second left in the period on a one-timer from the high slot on a power play.
Jake DeBrusk cut it to 2-1 at 2:01 of the second period after taking a pass while alone in the slot from Krejci.
Brad Marchand tied it 2-2 at 9:50, finishing off a 2-on-1 with Bergeron. The goal was Marchand's 26th while shorthanded in the NHL, passing Rick Middleton for the most in Bruins history.
"It's a great record to have, but setting it doesn't mean as much when you don't win," Marchand said. "It is hard to be happy when we all know we aren't playing well."
David Backes gave Boston a 3-2 lead at 19:00 when he redirected Kevan Miller's point shot past Howard.
Mantha completed the hat trick to tie it 3-3 at 1:17 of the third period with a power-play goal off a cross-crease pass from Bertuzzi.
"I just got my first hat trick earlier this season (Jan. 12 against the Minnesota Wild), so I know how special it is," Bertuzzi said. "When we went out there for the power play, I told [Mantha] I was going to get him the puck in that spot."
Hirose, playing his seventh NHL game, scored eight seconds later off a pass from Athanasiou to give Detroit a 4-3 lead.
"It's a great feeling," Hirose said. "I know when Andreas has the puck, everyone on the ice is watching him, so I just tried to find a spot where I could take a pass and get off a good shot."
Filip Hronek extended the lead to 5-3 at 12:03, and Larkin added an empty-net goal with 58 seconds remaining for the 6-3 final.
Video: Enterprise Hat Trick: Mantha nets three for Red Wings
They said it
"I think we probably got a little overconfident tonight, and we can't do that. We weren't tight enough, and that's a team with a lot of speed and skill and they took advantage of us. I'm not concerned, but we need to fix it." -- Bruins forward Brad Marchand
"There isn't a lot of pressure on us right now, and we've also got a lot of young guys up here who are trying to prove that they deserve to be here next season. I think we're building off that energy and we're playing good hockey." -- Red Wings coach Jeff Blashill
Need to know
Bruins forward Chris Wagner was a late scratch with a lower-body injury. … Bertuzzi has nine points (three goals, six assists) in a three-game multipoint streak. … Larkin has eight points (five goals, three assists) in a five-game point streak. … Athanasiou had two assists and has 10 points (six goals, four assists) in his past eight games. … Red Wings defenseman Danny DeKeyser left the game 46 seconds into the third period with a lower-body injury.
Bruins: At the Columbus Blue Jackets on Tuesday (7 p.m. ET; NBCSN, TVAS, NESN, NHL.TV)
Red Wings: Host the Pittsburgh Penguins on Tuesday (7:30 p.m. ET; FS-D+, ATTSN-PT, NHL.TV)
Video: Mantha's five-point night leads Red Wings past Bruins