Tim Thomas made sure Seguinís party had a happy ending, maiing 36 saves, a handful in the final five minutes, to hold off Tampa Bay.
Thomas denies Hedman's 40-foot slapper.
Thomas makes another game-saver at 16:09, this time from a prone position, on Marc-Andre Bergeron.
Four minutes to play, and one goal between the teams in a shootout.
3d period - 13:15 - Boston 6, Tampa Bay 5 - Dominic Moore scores on a wild sequence, with Victor Hedman knocking a shot that hits the right post, bounces over to hit the left post, drops to the ice. Bergenheim swoops in to put it away but shoots wide, and from the left, Moore pushes it into the scrum in front of Thomas who is down on the ice and has lost his mask, and it banks into the net.
12:39 - Bruins take a timeout.
Recchi sporting bloody lip from collision with Mattias Ohlund.
Krejci with big intercept on penalty kill, clearing puck.
Horton called for elbow on Mike Lundin at 10:07. Tampa Bay's 4th PP (1 for 3).
Thomas still making big saves, including a right kick save on Lecavalier at the midway point of the third. Shots are just about even: 32 for B's, 31 for Bolts.
3d period -3:47 - Boston 6, Tampa Bay 4 - Steve Stamkos gets one back for the Lightning, ripping a wrist shot from the left circle over Thomas's right shoulder, off a feed from Hedman.
Lightning kills penalty, but not before Seguin gets another roar from the crowd when he steps on the ice with the second PP unit.
Dominic Moore called for interference at 0:32. Bruins (2 for 4) get their 5th PP.
Mike Smith has replaced Dwayne Roloson in the Lightning net. It is his first game of the playoffs.
Tyler Seguin has two goals and two assists in 8:28 of ice time. This is a real turning point for him as he grows into his talents right before our eyes. His wispy teenage playoff beard is getting more manly by the minute.
The Bruins have scored two power-play goals in a game for the first time since March 27, against Philadelphia.
2d period - 19:41 - Boston 6, Tampa Bay 3 - Ryder strikes again, this time picking the rebound of Chris Kelly's shot off Roloson's pads and lifting a forehand into the right side of the net. Seguin started the play with a pass from the left wall with a centering pass to Kelly.
2d period - 16:16 - Boston 5, Tampa Bay 3 - After the first power-play unit sets up, moves the puck around and gets only a Seidenberg blocked shot, the second unit comes on -- with Seguin. Big roar from the crowd. And it plays off, when Seguin rifles a shot from the left sidewall. The puck bounds off Roloson, hits Michael Ryder in the skate and Ryder scoops it up and lifts a backhander over Roloson's right shoulder.
Bruins on the power play at 15:04 when Lecavalier called for hooking..
Lightning set up quickly and pass around the zone. Eric Brewer gets the shot but Krejci deflects out of the zone. Penalty killed.
Chara called for tripping at 10:18 and Tampa is on its third power play.
2d period - 7:48 - Boston 4, Tampa Bay 3 - Mark Recchi takes a cross-checking penalty at 7:29 and the Lightning take 19 seconds to cash it in. Vincent Lecavalier gets his sixth goal of the playoffs with a slap shot from the right circle, zipping it between Thomas's pads.
2d period - 6:30 - Boston 4, Tampa Bay 2 - This begins to feel like a movie. Tyler Seguin gets his second goal of the game on a 2-on-1 break with Horton. Horton carrying down the left side of the Tampa zone, passes across to Seguin, who rips a forehand to the far side. The kid is starting to show off a grin that rivals Horton's.
Thomas makes a stunning stop on Malone, who gets a clear breakway, fakes slapper and tries a backhand. Thomas stays with him to deny, and play bounces back to the other end.
Seguin slapping at a loose puck in the Lightning crease, but Roloson falls on it.
Krejci near-perfect set up for Horton but his shot is wide. Chara follows up with a quick shovel pass to Horton for a shot, Lucic can't get to the rebound.
2d period - 2:24 - Boston 3, Tampa Bay 2 - -David Krejci gives the Bruins their first lead of the game, taking a cross-zone pass sent by Seidenberg from the left side of the goal and redirecting a backhand deftly into the net. Krejci looked as if he had been waiting all day for that tip-in, his sixth goal of the playoffs.
2d period - 0:48 - Boston 2, Tampa Bay 2 - Another spectacular goal from the kid. Tyler Seguin gets his second goal of the playoffs and second goal in two games with a sweet solo effort, blwoing around Randy Jones as he flies down the Tampa zone carrying the puck on his forehand, pulls Roloson down to the ice, and deposits a backhander behind him. This is going to make office politics even more difficult in the Bruins locker room.
St. Louis opens the second with a break-in and shot on Thomas, deflected with a blocker out of play.
If you're keeping track, Tyler Seguin got 2:53 of ice time in the first. Not the least on the team... Daniel Paille had 2:38 and Shawn Thornton 1:38.
Seventh straight game in which the Lightning have scored first, and the ninth time in their 13 playoff games.
1st period - 19:53 - Tampa Bay 2, Boston 1 - What a cruddy way to end the period. After the Bruins outshot the Lightning, 18-11, in the period and dominated play, Martin St. Louis collects his seventh goal of the playoffs when Steve Stamkos's backhander from the right circle bounces off Boychuk and into the net as St. Louis crashes into Thomas. With 6.5 seconds left in the period.
At 19:03, Zdeno Chara called for unsportsmanlike conduct and Downie for roughing after scrum in front of Thomas.
Bruins picking up the pace with every step. Johnny Boychuk slams Steve Downie in the the endboards behind Thomas, and the puck rebounds toward the other end, where Brad Marchand steals it from Brett Clark. Marchand can't get a shot.
Daniel Paille a one-man wrecking crew on the penalty kill, nearly doing it all himself in the first minute.
At 17:16, Horton tagged with interference call and Lightning get their first power play of the game.
Bill Belichick in the audience, and crowd gives big cheer when he's shown on the big screen.
Bruins are 1 for 3 on the power play in this game, now 3 for 45 in the postseason.
1st period - 13:58 - Boston 1, Tampa Bay 1 - Finally! After swarming over the Lightning for most of the period. Bruins collect a power-play goal with one second remaining on the second penalty. Dennis Seidenberg cracks a shot from the right point, and with both Milan Lucic and Nathan Horton clogging up the goalmouth and screening Roloson. Horton tips the puck into the left side of the net. It is Horton's sixth goal of the playoffs, assist No. 6 for Seidenberg and assist No. 4 for Tomas Kaberle.
It's not now or never but it's close. Bruins have 1:22 of 5-on-3 power play after Ryan Malone is called for roughing at 11:20 and then Adam Hall for slashing Seidenberg at 11:59.
Marc Savard shows up on the big screen watching the game from a luxury box. Big cheers from crowd.
Adam McQuaid leads a charge up the center of the ice, shoots wide and Mark Recchi gets a shot at the rebound, but is denied.
Power play gets credit for three shots, but it's another exercise in futility. Hard to imagine Roloson was scared.
Ryan Malone runs into Seidenberg deep in the left corner of the Bruins zone and is called for an elbow at 6:32. Bruins first power play.
Tampa Bay calls a timeout.
Great shift from Brad Marchand and Rich Peverley on the 4 on 4 sets up more than a minute of sustained pressure from the B's in the Tampa Bay zone, enough to carry them through two line changes before the Lightning can clear the puck from their zone. Milan Lucic gets a good shot off from about 15 feet, and then puts the rebound wide. Nathan Horton's one-timer is deflected.
A Dennis Seidenberg scorcher from the right point in snapped up by Roloson with a glove save at 3:51.
Andrew Ference fires a long shot in on Dwayne Roloson, who makes the save and holds on as players from both teams starting pushing and shoving in front of the net. Ference and Victor Hedman draw roughing penalties at 2:31. It's 4 on 4.
1st period - 19:43 - Tampa Bay 1, Boston 0 - -- Early disaster. Quickest goal scored in Tampa Bay playoff history: Only 13 seconds have ticked off the clock when Adam Hall scores with a sharply angled backhander from the bottom of the leftt circle. Vincent Lecavalier gets the assist after shooting wide of the net from the right side. The puck bounced off the backboards and out the other side to Hall, whose swipe beat Tim Thomas to the far side. Ahem.
Puck dropped at 8:10 p.m.
Don't expect to see Phil Esposito, a member of the Bruins' 1972 and 1970 Stanley Cup championship teams whose jersey hangs from the rafters at TD Garden, taking a turn after he told Fox 13 Tampa last week, "I don't care about Boston. Tampa Bay is my home. The Lightning are like my child. I gave birth to it. It took everything I had physically and probably mentally." Esposito, who played nine seasons with the Bruins in his 19-year NHL career, helped found the Lightning in 1992, serving at first as the team's president and general manager.
Of the Bruins, Espo said, "I hope we smoke 'em to tell you the truth.''
Johnny Bucyk -- The Chief -- is tonight's honorary Fan Banner captain and just started the pregame ceremony of passing a giant Bruins banner around the loge.