DALLAS — Tyler Seguin had three goals and two assists to lead the Dallas Stars to a 6-1 victory over the Vancouver Canucks on Thursday night.Jamie Benn, Alex Goligoski and Ryan Garbutt also scored for Dallas, which built a 5-0 lead. Kari Lehtonen made 31 saves, and Benn and Rich Peverley each had two assists.Seguin scored twice in the first period and completed his hat trick at 12:53 of the third. His third three-goal game this season tied Bill Guerin and Mike Modano for the Stars’ record. Seguin also has two of the NHL’s six five-point games this season.Vancouver’s Zac Dalpe scored at 18:15 of the second period.Dallas solidified its hold on the eighth and final playoff spot in the Western Conference, improving to 9-3-2 in its last 14 games.The fading Canucks, 11th in the West, dropped to 1-10-1 in their last 12 and fell four points behind Dallas.Canucks goalie Eddie Lack stopped only 12 of 17 shots before being replaced by Jacob Markstrom for the third period. Markstrom, acquired earlier this week in the trade that sent Roberto Luongo to Florida, had four saves.Benn put in a rebound 2:57 into the game after Lack had stopped Seguin’s backhand.Seguin scored the second goal on a power play. He took a pass from Alex Chiasson behind the Canucks’ defense and fired into the upper right corner from in front of the net.Even at that point, the lead appeared safe against a team that had scored only eight goals in its previous eight games.Seguin made it 3-0 at 11:59, taking a pass off the boards from Peverley and turning and one-timing a shot between Lack and the right goal post.Seguin had five total assists in this season’s three games against Vancouver, all Stars victories.