The Bruins have 61 points, two more than Montreal, which played later at Winnipeg. The Canadiens finish their season at Toronto on Saturday. Boston has two more games and can clinch the division title with wins over Washington on Saturday and in the regular-season finale Sunday against Ottawa.
Dennis Seidenberg and Daniel Paille scored in the second period and Rask took care of the rest as the Bruins won despite being outshot 30-24.
Rask's previous start was a 3-0 shutout against Florida on Sunday.
Rangers 4, Hurricanes 3
RALEIGH, N.C. (AP) -- Rangers captain Ryan Callahan scored 2:55 into overtime, and New York rallied to clinch a third straight Eastern Conference playoff berth.
Derek Stepan and Derick Brassard staked the Rangers to the lead in the first period, and Henrik Lundqvist stopped 18 shots for New York, which jumped over the rival Islanders and into seventh place in the East with one game left.
Senators 2, Capitals 1, OT
WASHINGTON (AP) -- Sergei Gonchar scored 47 seconds into overtime, Erik Karlsson set up Ottawa's first goal in his sooner-than-anticipated return from a torn Achilles tendon, and the Senators clinched a playoff berth by beating Washington.
The overtime wins by the Senators and New York Rangers eliminated the Winnipeg Jets from the playoff chase.
The Senators, who have two games remaining, moved up to sixth in the East. If they remain there, Ottawa would face the Capitals, who have won 10 of 12 overall -- with the only losses against the Senators.
Flyers 2, Islanders 1
PHILADELPHIA (AP) -- Oliver Lauridsen and Danny Briere scored to lead Philadelphia over the New York Islanders, who dropped to eighth place in the Eastern Conference.
Lauridsen scored his second career NHL goal on a slap shot high above the circle late in the third period to lift the Flyers to a win in their home finale. They will miss the playoffs for the first time since 2007.
Canadiens 4, Jets 2
WINNIPEG, Manitoba (AP) -- The Winnipeg Jets saw their playoff hopes end on the scoreboard before they were beaten by Montreal.
The Jets were ahead 2-1 as they started the third but already knew whatever they did wouldn't be enough.
Both the New York Rangers and Ottawa Senators won to clinch the final two playoff spots in the Eastern Conference.
David Desharnais netted two goals, and Rene Bourque and Brendan Gallagher also scored as the Canadiens broke out of a slump in which they had lost five of six.
James Wright and Blake Wheeler scored for the Jets, who finished the season 24-21-3.
Red Wings 5, Predators 2
DETROIT -- Pavel Datsyuk had a goal and two assists, and Detroit moved a step closer to its 22nd straight playoff appearance by beating Nashville.
The Red Wings, who moved into seventh place in the Western Conference, need one more point to secure their spot in the postseason. They own the longest current playoff streak in North American professional sports.
Maple Leafs 4, Panthers 0
SUNRISE, Fla. (AP) -- Phil Kessel scored two goals to lead playoff-bound Toronto over last-place Florida.
Toronto snapped out of a 1-3, scoring four goals on just 17 shots. The Maple Leafs can't finish lower than sixth in the Eastern Conference.
Devils 3, Penguins 2
NEWARK, N.J. (AP) -- Ilya Kovalchuk scored his first goal since sustaining a shoulder injury last month, giving New Jersey a victory over Pittsburgh.
Penguins star Sidney Crosby missed his 10th straight game because of a broken jaw, but he was cleared by medical personnel to return to hockey-related activity.
Blues 4, Flames 1
ST. LOUIS (AP) -- Ryan Reaves scored twice and Brian Elliott earned his NHL-leading 10th win in April in St. Louis' win over Calgary.