Washington scored 17 seconds into the first period
The Penguins scored three times in the third period to rally past the Capitals 3-2 in Game One of their second round Stanley Cup playoff series.
Evgeny Kuznetsov scored just 17 seconds into the game and Alex Ovechkin made it 2-0 Washington 28 seconds into the third.
Patric Hornqvist, Sidney Crosby and Jake Guenztzel all scored in less than a five-minute span early in the third to give Pittsburgh the lead.
Matt Murray made 32 saves for the Pens, while Braden Holtby denied 22 shots for the Caps.