It wasn’t exactly the homecoming left-hander Jason Vargas or fans envisioned.

On Saturday night in San Diego, the 35-year-old was lit up like a firecracker, allowing nine runs and nine hits while doling out three walks in 3.2 innings, en route to a Mets 12-2 loss.

Vargas was struck on his non-pitching hand with a comeback line drive in Spring Training and was forced to miss the first month of the season with a fractured hamate bone and subsequent surgery.

“I made some mistakes early, got behind and I got them into some situations where they felt good swinging the bat and it just kept rolling from there,” Vargas said. “I wasn’t able to put some guys away with two strikes or two outs and just kept letting them extend innings.”

The night started off positive for Vargas, who fanned the first batter to face him, but things got ugly really quick. Eric Hosmer followed up with a single, and Christian Villanueva grooved his eighth homer of the year to put New York in an early 2-0 hole.

The Padres then logged two more hits, who came around to score on a triple from Manuel Margot which sealed the Mets fate very early on.

Vargas pitched a clean second, but only narrowly. Juan Lagares made a spectacular catch to rob Villanueva of his second homer of the game.

In the bottom of the third, San Diego put two runners on, as Jose Pirela and Freddy Galvis both singled and followed up with a double steal. They both came around to score on a single from Austin Hedges, who wound up with five RBI on the evening.

The fourth wasn’t much kinder as Vargas surrendered two walks and then paid mightily as Franchy Cordero rocketed his sixth homer of the year to bury the Mets in the ground, making it 9-0.

Vargas was then pulled for Seth Lugo, ending his evening.

“He left too many pitches in the middle,” manager Mickey Callaway said. “He didn’t get the ball where he wanted.”

The rough outing makes the Mets rotation all the more uncertain. Matt Harvey was recently bounced to the bullpen, while Steven Matz might not be far behind. Zack Wheeler, who is slated to pitch Sunday, has pitched decent but has a track record that is worrisome.

However, the veteran who signed a two-year, $16 million deal with the Mets this offseason, is just looking forward to his next outing.

“The fortune of the situation is I’m going to take the ball in five days and get a chance to pitch again,” Vargas said. “That’s the nature of the game and I definitely didn’t want to come out and get hammered like that tonight. Just get ready for the next time out.”

Callaway added that while Vargas will have a stinker like this again, it’s not going to happen every time.

“I know Vargas,” Callaway said. “He’s had those before, he’ll have them again. But he’s going to battle in the meantime.”