They won the Eastern Conference Second Round against the Boston Bruins in five games, stunning when you consider they lost 6-2 in Game 1.
"I don't think any team goes in thinking you're going to clean out a team in the second round in five, but it happened," Lightning captain Steven Stamkos said. "When you play the right way, you get rewarded for it."
Tampa Bay woke up after losing the opener and dominated the rest of the way, closing it out with a 3-1 win in Game 5 at Amalie Arena on Sunday. The Lightning advanced to the Eastern Conference Final, where they will face the winner of the second-round series between the Pittsburgh Penguins and Washington Capitals.
WATCH: [All Bruins vs. Lightning Game 5 highlights | RELATED: Complete Lightning vs. Bruins series coverage]
The Capitals lead the best-of-7 series 3-2 heading into Game 6 at PPG Paints Arena on Monday (7 p.m. ET; NBCSN, SN, TVAS).
"It's 100 percent buy-in from this group," Lightning coach Jon Cooper said. "That's why we're here and what we're doing now."
Cooper credited the Bruins for setting the bar for the Lightning, for showing them the level they had to get to, not only in Game 1, but in the regular season.
Tampa Bay lost to Boston on March 17 (3-0) and again March 29 (4-2). The Lightning responded with a 4-0 win against the Bruins on April 3, but Game 1 gave them a reminder of how far they needed to go.
"They made us a better hockey team by waxing us in the regular season," Cooper said. "We wanted to match them, and we did."