With the HBK Line last postseason, Hagelin had 16 points (six goals, 10 assists) in 24 games. He had 27 points (10 goals, 17 assists) in 37 regular-season games after the Anaheim Ducks traded him to Pittsburgh on Jan. 16, 2016.
But that success didn't carry over into 2016-17 season.
The HBK Line was kept intact during the early portion of the season and was reunited at several points before injuries forced Sullivan to shuffle the forwards. Before Hagelin was injured, he played left wing on a line centered by Evgeni Malkin; that came after he sustained a concussion Feb. 4 and returned Feb. 17.
Hagelin had 22 points (six goals, 16 assists) in 61 regular-season games; he scored one goal in his final 24.
Even with the injury, Hagelin said he has retained most of his speed and would like to use it against the Senators.
"I think we kind of knew what to expect [against Ottawa]," said Hagelin, one of the NHL's fastest players. "They play the way we expected. They're a really sound defensive team. They don't take many chances. They're solid in their own end. I think we have to be patient and let the game come to us."
Forward Patric Hornqvist took a maintenance day Sunday. That opened a spot for Hagelin, who skated as a right wing on the third line with Bonino and left wing Conor Sheary. Hagelin has been exclusively a left wing during his time in Pittsburgh, which makes it possible he was holding Hornqvist's place during line rushes.
Forward Carter Rowney also was given a maintenance day after playing the past two games. Tom Kuhnhackl took his spot on the fourth line.
Except for the two absences, the lines remained the same.
"We're going to take each game as it comes," Sullivan said. "That's all we can do is just stay in the moment."
Defenseman Trevor Daley (lower body) skated on his own Sunday, Sullivan said. He last played in Game 5 of the second round on May 6.