Patrice Bergeron tallied twice and added one 3 victory at Scotiabank Place.
Tim Thomas made 27 saves for the win.
Daniel Alfredsson scored a pair of late goals for the Senators, whose four- game win streak came to an end. Jason Spezza notched three assists and Erik Karlsson added a goal and two helpers in defeat.
Alex Auld allowed four goals on 37 shots in the loss.