Two teams considered most elite and that playoff seeding considered "favorites" will attempt to stave off elimination tonight on the road.
The Penguins will look to find some way to build a lead and then maintain it, while avoiding trends from the three previous games when their scores early on were surpassed after the Flyers came storming back.
Meanwhile, the Ottawa Senators will try to find a way to produce offense without captain Daniel Alfredsson against a stingy New York Rangers defense and Henrik Lundqvist's superb goaltending. Lundqvist stopped all 39 shots he faced in Game 3, a 1-0 Ranger victory in Ottawa.
And the Vancouver Canucks offense will try again to solve L.A. goalie Jonathan Quick, who has stymied them so far in leading his Kings to a 3-0 series lead.
Here's a quick preview of the six most important players from tonight's games, one from each team.