CHICAGO — The big three at the back end of the Yankees bullpen has been as advertised, and two of its three members will be in San Diego for the All-Star Game as a result.

That comes as no surprise.

Carlos Beltran will join them and good luck finding anyone before the season who thought that was a strong possibility.

Beltran’s career, of course, very well could land him in the Hall of Fame, but few foresaw the kind of season the 39-year-old has produced.

Coming into Tuesday night, Beltran, in the final season of a three-year, $45-million deal, has been the Yankees’ offensive MVP, posting a .296/.337/.567 slash line, with a team-best 19 homers and 53 RBIs.

“I’m very proud and very happy being able to accomplish this at this point of my career,” Beltran said after going 3-for-5 with an RBI in Tuesday’s 9-0 victory. “It has been a lot of work throughout my career.”

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It will be Beltran’s ninth All-Star appearance and first since 2013.

“What he’s done this year, you could argue he can be a starter,” Betances said. “For him to do it at this stage of his career . . . I can’t wait to share that moment with him.”

The 31-year-old Miller, who has a 1.47 ERA in 36 appearances, striking out 66 in 36 2⁄3 innings, earned his first All-Star bid.

“It’s a pretty cool achievement,” said Miller, who was told by Girardi of the honor before first-pitch Tuesday. “It’s one of those things you dream about getting an opportunity to do. To do it at this level is something special. I don’t know what to expect. I’ve never been, never counted on going to one, so it should be a lot of fun.”

The 28-year-old Betances, named to his third straight All-Star Game, has a 2.63 ERA in a team-high 41 appearances. He has struck out 74 in 41 innings.

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“I knew there was a chance but I wasn’t sure,” Betances said. “I’m blessed. For me to say I’ve been in three All-Star games. My first three years in the league, I put in a lot of hard work. It wasn’t easy for me to get here.”

Closer Aroldis Chapman was also a candidate, posting a 2.86 ERA while going 16-for-17 in saves and striking out 33 batters in 22 innings, but might have been hurt by missing the first month of the season, suspended under MLB’s domestic abuse policy.