"This is the two-time defending Stanley Cup champions, so we're excited we won and played well, but we're not getting ahead of ourselves here," coach Bruce Cassidy said. "We know who Tampa Bay is, they know who they are, and the road runs through them eventually.
"But this is good. It's good for the guys in the room to know that if we play a certain way, we have a chance to beat them and outplay them in certain areas."
Brandon Hagel and Steven Stamkos each scored, and Andrei Vasilevskiy made 36 saves for the Lightning (39-18-6), who have lost three straight and are 2-6-0 in their past eight games.
"Part of you is sitting here, saying 'Hey, we've got a veteran team. We've been there before, won a couple times, and we'll come out of it.' The other part of you is saying, 'Why are we in this at this point in the season?'" coach Jon Cooper said. "Teams go through this. It's 82 games. … We're better than this. If we're going to execute the way we're executing right now, it's not going to get better any time soon."
Hagel made it 1-0 with the first shorthanded goal of his NHL career at 7:11 of the second. He one-timed a pass from Ondrej Palat on a 2-on-1 for his first point with Tampa Bay after being acquired from the Chicago Blackhawks on March 18.
"I think there were spurts in the game where we were on our game, playing well, and there were other times we kind of let it slip away," Lightning forward Anthony Cirelli said. "We're battling out there, and sometimes it doesn't go your way. So, we've got to keep working, and get back at it."
Pastrnak tied it 1-1 at 9:55, finishing a forehand-backhand move on a breakaway after a lob pass from Haula.