DALLAS — Kari Lehtonen made 24 saves for his second shutout in three games to lead the Dallas Stars to a 3-0 victory over the Pittsburgh Penguins on Saturday night.Sergei Gonchar, Jamie Benn and Rich Peverley had Dallas’ goals, and Lehtonen also had an assist for the second consecutive game. The Stars have won their last three games by a combined 14-1 margin. Gonchar had a power-play goal, his second score this season, with just under 5 minutes remaining in the first period against his former team. Dallas has scored with a man advantage in seven consecutive games. Alex Goligoski, another former Penguins player, had an assist when Benn scored to make it 2-0 at 3:14 of the second. Peverley closed the scoring a little more than 7 minutes later.Goligoski has five assists in his last three games. Lehtonen faced only 12 shots during the first two periods, before the Metropolitan Division-leading Penguins doubled their attempts in the third.He stopped Pittsburgh’s Evgeni Malkin point-blank 9 1/2 minutes into the third. Dallas dominated the first period, with 10 shots on goal to Pittsburgh’s 4, and scored first. Gonchar took a pass at the top of the slot from Ray Whitney on the right wing boards, and fired a high shot over Penguins goalie Marc-Andre Fleury. Lehtonen, who received an assist on the score, leads NHL goalies with four assists this season. He has 31 in his career, with a high of six in 2010-11.The Penguins’ Kris Letang went off for roughing at 1:14 of the second period. One second before the penalty expired, Benn took a pass from Goligoski in the right faceoff circle and shot over Fleury’s shoulder to make it 2-0. Benn has nine points in the past seven games. The two power-play goals came against Pittsburgh’s league-leading unit, which entered the game with a streak of 11 successful penalty kills. Midway through the second period, Shawn Horcoff stole the puck in the neutral zone and passed to Peverley, who skated into the right circle and shot into the upper right corner of the net with 9:40 remaining. The Stars again outshot Pittsburgh in the second 12-8.