ANAHEIM, Calif. — Oswald Peraza has his best opportunity yet to stake claim to a regular role with the Yankees.

If Monday’s game was any indication, the 23-year-old is ready for his shot — though he regressed badly Tuesday.

In another brutal game for the Yankees’ offense overall on Monday — a 4-3, 10-inning loss to the Angels — arguably their five best plate appearances came from one player who was still in Triple-A as of Saturday.

Batting leadoff for the first time in his big-league career, Peraza reached base all five times on a single and four walks.

He saw 34 pitches in total, working three-ball counts each time, putting together the kind of grind-it-out at-bats the Yankees have largely been missing.

“It’s one thing to come up and get results,” manager Aaron Boone said before the Yankees’ ugly 5-1 loss Tuesday. “Those are high-level at-bats he put up there. That’s encouraging to see.

“When you couple [that with] the kind of athlete, the defender and the kind of impact he can have on the bases, hopefully that’s something that not only gives us a spark but gives him that little bit of added boost of confidence that he can be that kind of player up here.”

Peraza led off again Tuesday night, but came crashing back down, going 0-for-4 with three strikeouts.

Peraza, who said he even impressed himself getting on base five times, has not necessarily been known for his plate discipline on his way through the minor leagues.

But it has been a focal point for him because the Yankees believe it can be part of his game.

Before Monday, he had walked nine times in 96 major league plate appearances.

“Just working on my routine to get better,” Peraza, who also stole a base Monday, said through an interpreter. “It’s something that I worked on in Triple-A, especially when you’re seeing pitches close in the zone but not in the strike zone.

“If I’m able to take those pitches, it just gives me a better chance.”

When Peraza was called up on Sunday to replace the injured Josh Donaldson, Boone said he envisioned Peraza playing a lot.

Peraza said he worked on improving his defensive flexibility while at Triple-A because he knew his best path to playing time with the Yankees was likely by moving around the infield.

Now, about three and half months removed from losing out on the shortstop job to Anthony Volpe, Peraza believes he is better because of it.

“Actually that helped me out a lot, going down to Tripe-A and working on some other things,” Peraza said. “I feel like given that time and the experience to become a better player, it has allowed me to grow.

“I’m a better player today than I was back then.”

A day later, Boone said he did not second-guess his decision to not intentionally walk Shohei Ohtani in the seventh inning, when the Angels superstar instead hit a game-tying, two-run home run.

“I don’t question it there in that seventh,” Boone said. “With the lead and him as the tying run, I’m comfortable it was the right thing to do. Nobody asks about pitching to him to lead off the ninth because you get him out. If you don’t get him out there, it’s the same question.

“As great as he is … it’s still less than 10 percent of the time he’s hitting the ball out of the ballpark.”

The Yankees announced on Tuesday that they have signed 17 of their 18 picks from last week’s MLB draft. The only one that has yet to sign — the deadline is next Tuesday — is fourth-rounder Roc Riggio, an infielder from Oklahoma State.