Mark Stone scored a goal and picked up an assist in his return to Ottawa, leading Vegas to a 4-2 victory over the Senators in Peter DeBoer's debut as the Golden Knights' coach.
The win snapped a four-game losing streak for the Knights, who fired Gerard Gallant on Wednesday.
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Peter Stastny, Chandler Stephenson and Ryan Reaves also scored for Vegas. Marc-Andre Fleury stopped 33 shots for Vegas, tying the New York Rangers' Henrik Lundqvist for fifth place on the NHL's career list with 458 wins.
The Senators extended their losing streak to nine games. Vladislav Namestnikov and Connor Brown scored for Ottawa.