Jonathan Lucroy epitomizes the Amazin’ A’s, who will take on the Yankees in the AL wild-card game Wednesday night at Yankee Stadium.

No one expected Lucroy to be in the postseason. In fact, in March the veteran catcher didn’t have a major league job.

No one expected the A’s to be one of five AL teams in the postseason.

Lucroy brought the A’s pitchers home, and come Wednesday night he will have to guide a slew of relievers past the Yankees’ mighty bats as the A’s will make it a full bullpen game.

If you are looking for perspective, this is the guy to turn to.

“We’re a very tight team. Everybody is on the same page. You’re playing for the A’s and we are known for having a chip on our shoulder,’’ Lucroy told The Post. “We don’t have the best of anything. We’re not spoiled. I mean we travel really well, we stay in nice hotels, but everything else is not the best quality. We’re used to kind of fighting for everything. We’re used to adversity. It’s something that this team has really rallied around and has kind of made it our identity.

“We’re a bunch of grinders and we are a bunch of blue-collar guys that just want to go out and win. Scrappy is the word.’’

And that is the team the Yankees will have to beat to advance to the ALDS and Boston.

“You get a lot of these teams that are high-payroll teams,’’ Lucroy said. “We’re the lowest payroll in baseball. We’re happy where we are. We are a really good club with a lot, a lot of talent here. We’re sneaky and teams don’t like playing us. Because we can put up a lot of runs pretty quick.’’

In no way are the A’s intimidated by playing in Yankee Stadium.

“Not at all,” Lucroy said. “We’re actually looking forward to it. It’s going to be a challenge. I played in the wild card last year with the Rockies against the Diamondbacks and I try to tell my teammates, ‘Look, it’s going to be a crazy game. It’s going to intense. It’s going to loud and we got be mentally prepared for it.’

“Guys here, these young kids like Matt Chapman, that guy would play right now if we could. These kids in here are ready to go and our bullpen is fired up, ready to roll. Our lineup is champing at the bit to get after it, so we are really excited about going in there.’’

There you have it.

The A’s have a powerful offense led by Khris Davis, who led the majors with 48 home runs and drove in 123 runs and, by the way, hit .247 for the fourth straight year. Stephen Piscotty is red hot and is another power bat with 27 home runs and 88 RBIs; Jed Lowrie hit 23 home runs and drove in 99 runs while Chapman slugged 24 home runs and Matt Olson bashed 29. Shortstop Marcus Semien owns 15 home runs and 70 RBIs.

Like the Yankees’ Neil Walker, Lucroy was one of those veterans stuck without a job in spring training.

“In March I didn’t think I’d be here in the playoffs right now,’’ Lucroy said. “It’s just one of those things that ended up working out. I didn’t have quite the year I wanted on the personal level [four HRs, 51 RBIs, .241 in 415 ABs], but as far as team-wise, it’s been great. We’re fortunate and blessed to be here.

“I’ve been on a great ride with these guys all year, I’ve seen some amazing things. Been a part of some pretty big moments, a no-hitter [by Sean Manaea] and watching Khris Davis hit almost 50 home runs, that’s been amazing for me. Being around these guys on an everyday basis is awesome.”

Defensively, the A’s have tightened up tremendously, and that makes them so tough to beat.

Lucroy said the relievers are going to attack the Yankees.

“We’re going to go right after them. It could turn out to be a bullpen game for both sides. It’s going to be a crazy game either way.’’

Crazy fun in The Bronx.