The Yankees had their Opening Day on April 1. Curtis Granderson — out since fracturing his right forearm in spring training — finally had his last night.

Granderson, activated before the game, started in left field and scored a run in the Yankees’ 4-3 come-from-behind win over the Mariners at the Stadium.

“It’s just like another Opening Day, nerves coming into it since it’s the first game of the 2013 season, to be here in Yankee Stadium for the first time since last season,” said Granderson, who went 0-for-3 with a walk. “All of those different things ran through [my mind], the emotions, the excitement.

“To get the first ball, the first at-bat out of the way is definitely a relief. Now I can ... get back to playing baseball.’’

Granderson suffered the broken forearm on Feb. 24 when he got hit by a pitch in his first spring training at-bat. Last night, he was the first of the Yankees’ sidelined stars to return — Derek Jeter, Alex Rodriguez and Mark Teixeira are still out — and the PA announcer greeted Granderson with “Welcome back.’’

Granderson hit into an inning-ending double play to end the first and fanned in the third. But after reaching on a fielder’s choice in the sixth, he came around from first to score the first run on Lyle Overbay’s double. After the Mariners intentionally walked Vernon Wells to face him in the seventh, he walked to advance Robinson Cano to third. Cano later scored the winning run on Overbay’s sacrifice fly.

“I thought he looked fine, got deep into counts,’’ said manager Joe Girardi, who has the task of trying to juggle Brett Gardner, Granderson, Ichiro Suzuki and Wells into three spots. “I didn’t think he chased many pitches, and to not chase pitches against Felix [Hernandez] is pretty good.’’