What happened: The Pittsburgh Penguins defeated the Philadelphia Flyers in Game 4 of their first-round playoff series on Sunday. Pittsburgh staved off elimination and avoided a sweep on the road in Philly. The series now heads to Game 5.

Why it matters: The victory keeps Pittsburgh's playoff hopes alive after trailing 3-0, shifting momentum back to the Penguins. It builds on the Flyers' 2-0 series lead established earlier. A Penguins win extends the series, impacting playoff paths for both teams.

What to watch: Watch Game 5 in Pittsburgh for potential series shift.