Zdeno Chara also scored as Boston won for only the second time in six games.
Tuukka Rask stopped 31-of-32 shots for the Bruins.
Joffrey Lupul got the only goal for the Maple Leafs, who fell in their first visit to Boston since losing in overtime in Game 7 of last season's Eastern Conference quarterfinals.
James Reimer made 31 saves for Toronto.
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