Buffalo has won all five meetings between the teams this season, including a pair of 3-2 victories over its division rival in the last eight days.
With 87 points, the Sabres trail first-place Ottawa by two points and lead Philadelphia by seven points for the fourth seed in the Eastern Conference.
In the Sabres’ 6-5 win Saturday over the Flyers, Mike Grier scored with 4.6 seconds to play to help Buffalo improve to 12-1-2 in its last 15 games.
Jochen Hecht added a goal and three assists for the Sabres, who outshot Philadelphia 39-21 and converted 2-of-7 power-play opportunities.
Following a wild second period in which the teams combined for seven goals, the Sabres entered the third trailing 5-4.
Chris Drury knotted the score with his 20th goal of the season at 5:06, and Grier’s game-winner came after he took a pass from Derek Roy from behind the net to beat Flyers goaltender Antero Niittymaki.
“We really played a tremendous game,” Sabres coach Lindy Ruff said. “We gave up scoring chances because maybe we were a little too aggressive, but that same aggressiveness won us a game.”
Daniel Briere had a goal and two assists to extend his point streak to eight games. He has five goals and 10 assists over that span.
Briere has six goals and 12 assists in 16 lifetime games against the Bruins, against whom he has a seven-game points streak.
Boston has lost four straight games and is 1-6-1 in its last eight overall.
In an effort to improve an offense that has scored four or mroe goals just twice in its last 18 games, the Bruins inserted newcomers Marty Reasoner, Yan Stastny and Mariusz Czerkawski into the lineup Saturday, but lost 3-1 to the New York Islanders.
Thomas made 42 saves, but fell to 0-5-1 in his last six starts after compiling an 8-2-3 mark in his first 13 decisions.
“We’ve got to score goals,” Boston coach Mike Sullivan said. “It’s tough to win games when you only score one goal. Obviously, that’s been our nemesis the last couple of games.”
Reasoner and Stastny were acquired from Edmonton for Sergei Samsonov on Thursday, while Czerkawski began his second stint with the Bruins after he was claimed off waivers Wednesday from Toronto.
All three players were held pointless Saturday.