Danton Heinen and Brian Boyle scored second-period goals Tuesday as the undermanned Pittsburgh Penguins cooled off Tampa Bay's Stanley Cup celebration, beating the host Lightning 6-2 in the NHL's season opener.

The Tampa Bay Lightning will begin their Stanley Cup defense and look to start a three-peat in a banner-raising, regular-season opener against the visiting Pittsburgh Penguins on Tuesday night.

The Seattle Kraken will become the NHL's 32nd franchise when they open their season Tuesday on the road against the team that was the 31st to join the league, the Vegas Golden Knights.