BOSTON (AP) _ Brian Rolston, acquired earlier this month in the trade that sent Ray Bourque to Colorado, had a goal and an assist and Sergei Samsonov added three assists in Boston Bruins' 4-0 victory over the Tampa Bay Lightning on Tuesday night.

Robbie Tallas made 16 saves and improved his career mark against the Lightning to 8-1-1 before he was replaced by John Grahame for the final period because of a stiff neck. Tampa Bay has won just once in 15 games at Boston.

Mike Knuble gave the Bruins a 1-0 lead in the first period when he deflected Rolston's slap shot from inside the point past Tampa Bay goaltender Zac Bierk on the power play. It was Knuble's 11th goal of the season.

Boston made it 2-0 when Rolston notched his 14th on a power play 2:10 into the second period. Rolston's slap shot from just outside the left circle gave him three goals and three assists in seven games since joining the team on March 6.

Joe Thornton scored his 21st midway through the second when his backhander slipped off Bierk's shoulder and into the net. Mikko Eloranta added his sixth early in the third period.

Bierk (3-3) finished with 38 saves for the Lightning, which finished a successful five-game road trip at 2-2-1. Tampa Bay has just six road wins this season, which is the franchise low for a season.

Tallas (4-10-4) was injured early in the second period and remained on the ice for several minutes after Todd Warriner tripped going to the net and collided with the goalie. Tallas appeared to jam his back and net on the post, but remained in the game until the third period.

The Bruins defense tightened up after Tallas was hit and allowed seven shots on goal over the final two periods. Grahame stopped three shots.