David Legwand netted the go-ahead score on a power play with 1:14 remaining in regulation, and Ottawa rallied for a 4-2 victory over Montreal in the exhibition finale for both clubs.
Mika Zibanejad recorded a man-advantage tally earlier in the final period and Curtis Lazar provided an empty-net goal for the Senators, who begin their season at Nashville on Thursday.
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Craig Anderson picked up the win by stopping 26-of-28 shots.
Andrei Markov and Max Pacioretty lit the lamp for the Canadiens, who open their 2014-15 regular season at Toronto on Wednesday night.
Carey Price allowed three scores on 27 shots in the setback.
[SportsNetwork.com]