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“I don’t think we got lucky tonight,” Clemmensen said. “I think we just willed it a little bit. It doesn’t always go your way obviously. You stick with it and nights like tonight happen.”

Shore entered with just four goals in 54 career games and has spent most of this season in the American Hockey League.

Still, he scored twice in less than 20 minutes to stake Florida to an early lead that was more than enough to end Pittsburgh’s two-month run of perfection.

The Penguins entered the night having trailed barely 10 percent of the time at home since their streak began. A significant chunk came in last week’s 4-3 comeback victory over Washington, when they rallied from a goal down three times to escape.

It was the kind of game that’s popped up frequently since Christmas, where Pittsburgh’s high-powered offense was able to overcome some uncharacteristic lapses at the other end of the rink.

The miscues finally caught up with them.

A rare breakdown by the league’s top power-play unit gave Shore the chance to stake Florida to an early lead.

Clemmensen stopped Evgeni Malkin’s shot, then passed to Shore to spark a two-on-one that ended with Shore flicking a wrist shot over Fleury’s shoulder 15:46 into the first period.

The Panthers had three opportunities in the second to double their lead only to let three straight power plays go to waste before Shore struck again.

Huberdeau stripped a Penguin behind the Pittsburgh net, slid the puck to Jesse Winchester, who found a streaking Shore down the slot. The wrist shot caromed off Fleury’s shoulder and into the net to make it 2-0 at 13:34 of the second.

Kulikov pushed the Florida lead to 3-0 by taking a long bounce off the end boards then beating Fleury just 1:17 into the third.

Niskanen’s seventh goal of the season 5:11 into the period briefly gave the Penguins some energy, but it faded when Huberdeau and Matthias scored 12 seconds apart to send the Panthers to the upset.

NOTES: Pittsburgh went 0 for 3 on the power play. … The Panthers have killed 31 straight penalties. … Florida is 10-0-1 when leading after two periods. … Pittsburgh hosts Montreal on Wednesday. … The Panthers play at Buffalo on Tuesday.