The Penguins have been outscored 24-8 during a season-long six-game losing streak since defeating the Toronto Maple Leafs 5-2 on Feb. 18. They moved into first place in the Metropolitan Division with that win, but have since fallen to third, three points behind the second-place Philadelphia Flyers and six behind the first-place Washington Capitals.
Pittsburgh last lost at least seven straight in regulation during a 10-game streak from Jan. 6-23, 2006.
The Senators have won their past two games following a four-game winless streak (0-3-1). A third straight win would match their longest streak this season, when they won three in a row from Nov. 19-22.