Pittsburgh's Chris Kunitz and Boston's Rich Peverley were called for unsportsmanlike conduct 5 seconds before intermission, a preview to the main event moments later.
NPR: Bruins Drop Penguins 3-0 To Take Early Lead
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They extended their lead to 2-0 in the second period when Rich Peverley blew a slapshot past Leafs goalie James Reimer, quieting the raucous home crowd.