The whitewash was Lehtonen's first of the season and allowed Dallas to avoid its longest losing skid of the season heading into the NHL All-Star Game break.
Alex Goligoski -- who signed a four-year contract extension worth $18.4 million with Dallas Monday -- scored the only goal of the game.
Jonas Hiller wasn't tested often, yielding the single tally on 16 shots in the Ducks' loss.
Anaheim had a season-best five-game winning streak snapped.
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