Seguin/By S. Bradley

BOSTON — Bruins head coach Claude Julien wouldn’t reveal this morning who’s going to start in Nathan Horton’s vacated spot on the first line tonight in Game 4 of the Stanley Cup Final.

However, he did confirm that, as expected, rookie Tyler Seguin would get Horton’s vacated lineup spot.

Seguin pretty much understood that when he spoke to the media after the team’s morning skate at TD Garden.

“It’s about being good in your defensive zone and hopefully that will lead to offensive opportunities,” said Seguin. “I feel like if I go out there worried I’m going to make mistakes, that’s when I’m going to make them. If I go out there confident and focused, I shouldn’t make any. So that’s my mindset going into tonight.”

Just as Shawn Thornton didn’t know until after warm-ups his streak of healthy scratches was going to end at seven in Game 3, Seguin didn’t know he was out until then.

“Obviously, you’re going to be mad when you’re not playing,” said the rookie, who has been point-less since his four-point explosion in Game 2 of the Eastern Conference Final. “But I wished Thorty lots of luck and just went and did my thing in warm-ups and then went to the workout room.”

Seguin said that his performance in a couple of Boston’s bigger games in the last round helped boost his confidence and that watching Game 3 of this series from the press box helped him learn some tendencies of the other team.

He also feels “rested and energized.”

We don’t know for sure what line he’ll be skating on tonight. We just know that he’s going to be a big part of the committee that’ll try to make up for the loss of Horton’s production.