Price was busiest in the second period when he stopped all 16 shots he saw for Montreal, which also bested Buffalo Saturday and notched its sixth victory in seven games overall.
David Desharnais and Erik Cole each recorded a first-period goal to overcome an early 1-0 deficit in the Habs' triumph.
Jakob Silfverberg found the net and Craig Anderson stopped 30-of-32 shots for the Senators, who dropped a second straight.
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