Tampa Bay Lightning captain Steven Stamkos was still coming to terms with a franchise record loss after the two-time defending champions were drubbed 7-0 in Game 2 of the Stanley Cup Finals against the Colorado Avalanche.

Three days on from a close-fought Game 1 loss, the Florida outfit were soundly smashed at Ball Arena as they capitulated to leave an arduous path back to a third consecutive title.

After an overtime clash before that indicated a tight postseason battle for hockey's biggest prize, the Lightning were no match for the Avs, suffering their largest ever playoff defeat.

"Am I shocked that we lost seven-zip?" Stamkos stated. "I mean, I don't think we saw that coming.

"We have a game plan, and it's trying to neutralise their speed and their forecheck. And we've gotten away from it a little bit at times, and it cost us."

Stamkos in particular said the team owed an apology to goaltender Andrei Vasilevskiy, who suffered a torrid night as the Avs ran rampant.

"We left him out to dry tonight," he added. "He's been our backbone for years and years and years. We owe it to him to have a better game next game. By no means is this on him tonight."

This was just the fifth instance of the defending Stanley Cup champions falling 2-0 behind in a Finals series, with only the 1966 Detroit Red Wings recovering to take the title again.

Meanwhile, the 1980 New York Islanders are the sole team to have allowed 11 or more goals through two games and still won the Finals.

But with two games back home to restore parity, the Lightning are adamant that they are not out of the picture yet.

"It takes a great team to realise the mistakes that we've made," Stamkos added. "And I have full confidence in this group that we'll have a much better effort.

"Listen, people are going to be watching this game tonight and probably think the series is over. But we're a very resilient group. We were in this position last round.

"So, whether it's 1-0 or 7-0 or 10-0, it's a loss in the playoffs. We've got to man up as a team. Let's get back home in front of our fans, and let's see what we're made of."

Defenseman Victor Hedman added: "At the end of day, we lost the game, not the series."