Couturier took the next step this season and was phenomenal, and kept it going in the playoffs.
The Penguins will move on to play the victor of the series between Washington and Columbus.
Couturier, 25, scored the game victor in the Flyers' 4-2 victory in Game 5. Our team doesn't get rattled.
Giroux was able to put together a career-best regular season in 2017-18 - putting up 34 goals and 102 points - but wasn't able to carry this success into the playoffs.
"This is what you want to play in", Guentzel said. "We're just trying to roll with it as it goes".
But Filppula, who has experience in the pressure cooker of the Stanley Cup (he won a ring with Detroit in 2008), came through to keep the Flyers in it.
Couturier did it all with a torn medial collateral ligament which he revealed after Sunday's game he had suffered in a practice before Game 4, which he missed. "I just tried to lay it all out there and give it all I had".
He tied it at 4 with 54 seconds left in the second period off a Flyers turnover.
However, Pittsburgh scored 5 consecutive goals to take a 7-4 lead with 7:02 left in the 3rd period. Their only series win was against Boston in 2010, when they actually overcame a three-games-to-none deficit.More news: Man 'admits arson' after karaoke bar fire kills 18 people in China
The Penguins responded with Crosby tying the game at 1 at 6:30.
As the period hit the halfway point, shots were 2-0 Penguins.
Couturier also led a penalty-killing unit that was 5 for 5 - against the league's top power play - and scored a shorthanded goal. Flyers coach Dave Hakstol gave the refs an earful while the fans howled as the hits were shown on replay.
The Penguins almost scored on an extended stretch of 6-on-5 play, as the Flyers could not touch up on a delayed penalty call.
Laughton later propelled the Flyers ahead 4-2 with a wrist shot from about 30 feet out at 12:14.
The Flyers killed off the remainder of the penalty to start the second and Matt Read got Couturier the puck ahead of the field on a breakaway.
The team won without Evgeni Malkin, who was out with a leg injury. The so-called home ice edge in Philly lost some shine with large pockets of empty seats for a must-win Game 6.