The Stars built a 5-0 lead en route to their fifth win in six games.
Seguin, obtained in a trade with Boston prior to this season, had two goals in the second period and two more in the third. He ran his total to 12 for the season, producing the four goals on six shots.
Calgary has lost five in a row.
The previous high goal total for Dallas this year was five, which the Stars also produced against Calgary on Oct. 24.
Kari Lehtonen earned the victory with 25 saves.
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