COLUMBUS, Ohio (AP) — The Tampa Bay Lightning, the NHL’s best team, lost their first two playoff games at home to the Columbus Blue Jackets and are vulnerable without their top scorer for Game 3.

Winnipeg lost its first two at home, leaving the Jets fighting for their postseason relevance as that series shifts to St. Louis.

The Pittsburgh Penguins are loaded with stars who have years of playoff experience. The Pens are down 2-0 to the New York Islanders as their series moves to the Steel City.

So much for home-ice advantage and conventional thinking in these NHL playoffs.

The Blue Jackets have been in this heady position before in the postseason, just before they fell on their faces.

Now they have the Tampa Bay on the ropes and are enticingly closer to winning the first playoff series in franchise history. The series shifts to Columbus on Sunday night (7 p.m., NBCSN). The Lightning will be without 128-point scorer Nikita Kucherov , who was suspended for a game for boarding the Markus Nutivaara on Friday night.

Last year the Blue Jackets went up 2-0 in the first round against Washington on the road before the Capitals won four straight and rolled on a Stanley Cup championship. In other words, there’s a lot of hockey left to the play in the series, and the Blue Jackets players know it all too well.

Columbus has risen to the occasion and hasn’t backed down from their opponents.

Islanders at Penguins,

New York leads series 2-0 (noon EDT, NBC).

During their current run of 13 consecutive playoff appearances, the Pittsburgh Penguins lost in the first round three times. They’ll need to turn things around quickly to avoid a fourth.

Pittsburgh took its first lead in the series in the second period of Game 2 before the Islanders tied it minutes later and then pulled away in the third period for a 3-1 win.

The Penguins will look to regroup as they head home for the next two games. They know it’s not an insurmountable deficit.

The Islanders have held Jake Guentzel, who led the Penguins with 40 goals during the season, and star center Sidney Crosby (35 goals, 65 assists) off the scoresheet in the first two games.

Pittsburgh, sixth in the NHL in scoring during the season, has scored four times on 76 shots against an Islanders team that allowed the fewest goals in the league. After finishing fifth on the power play at 24.6 percent, the Penguins are 1 for 5 so far.

Jets at Blues,

St. Louis leads series 2-0 (7:30 p.m. EDT, CNBC)

The Jets’ confidence is not shaken after losing each of the first two games of the series by one goal.

Oskar Sundqvist scored twice, and Ryan O’Reilly broke the tie early in the third period to give the Blues the edge as the series shifts to St. Louis.

Jordan Binnington made 26 saves for St. Louis, becoming the second goalie in franchise history to win his first two playoff games.

Sharks at Golden Knights, series tied 1-1 (10 p.m. EDT, NBCSN)

Taking penalties against San Jose usually isn’t the right recipe for success, especially with the Sharks’ two potent power-play units led by dynamic defensemen Brent Burns and Erik Karlsson and a talented group of forwards.

Vegas survived that in Game 2 and even came out ahead when the Sharks had the man advantage. The Golden Knights committed eight minor penalties that gave San Jose power plays, including one minute of five-on-three action in Game 2.

But Vegas got the better of the play in those situations, scoring two short-handed goals and allowing just one on the power play, which proved to be pivotal.

San Jose is just 2 for 13 on the power play this series, with two goals allowed, a far cry from a unit that ranked sixth in the league in the regular season at 23.7%.