First Collin Morikawa.

Now Matthew Wolff?

Wolff, 21 years old and less than two years removed from his sophomore year in college, nearly won the PGA Championship last month with a dramatic Sunday charge that electrified Harding Park in San Francisco.

That charge fell short when the 23-year-old Morikawa, his college contemporary, seized the moment on the final few holes and hoisted the Wanamaker Trophy while Wolff finished tied for fourth.

As the U.S. Open enters its final round Sunday at Winged Foot, the championship is Wolff’s to win or lose. He has a two-shot lead after shooting a tournament-low 5-under 65 in Saturday’s third round to get to 5-under for the tournament.

He’s the youngest 54-hole leader in a U.S. Open in 45 years.

Bryson DeChambeau, playing alongside 36-hole leader Patrick Reed in the final group, is 3-under after shooting 70 and trails Wolff by two shots. Louis Oosthuizen, the only other player in the field who’s under par, is 1-under and four shots back after shooting 68.

Reed, who began the day at 4-under with a one-shot lead over DeChambeau, opened up a three-shot lead after the second hole, which he birdied. But he struggled mightily from there and finished with a 7-over 77 to stand at 3-over, eight shots behind Wolff.

Xander Schauffele (70), Hideki Matsuyama (70) and Harris English (72) are even par and five shots back.

Rory McIlroy, who shot 68, is 1-over and six back. Reed, Zach Johnson, Rafa Cabrera-Bello and Viktor Hovland are all within striking distance at 2-over.

With Reed and DeChambeau struggling, Wolff leapfrogged them, seizing control of the day and the tournament with a blistering 30 on the front nine with five birdies and nary a blemish on his card.

“Everyone knows how talented Matt is,’’ McIlroy said. “He played great at Harding Park in the last major. He’s explosive like that. I certainly didn’t see [anyone] shooting 30 on any nine today. Geez, I think anything under par on this golf course today is a really good score.’’

It was a stunning performance for Wolff, the former Oklahoma State star who’s playing in only his second career major championship, first U.S. Open and 29th professional event. He won his third PGA Tour start last year when he captured the 2019 3M Championship.

Wolff overtook DeChambeau with a long eagle putt on the 72nd hole to win that 3M Championship. This past July, Wolff took a three-shot lead into the final round of the Rocket Mortgage in Detroit and was overtaken by DeChambeau, who carded a final-round 65.

On Sunday, they’ll play together in the final pairing. More compelling stuff to come.

“I am excited to be in this position for sure,’’ DeChambeau said. “There’s no better place to be.’’

Wolff this week has gone against the most conventional perceived method to succeed at Winged Foot: Hitting fairways. He’s hit just 12 of 42 of them in three rounds and was just 2-of-14 on Saturday. Yet he still shot the lowest round of the week.

He ranks 58th among the 61 players still in the tournament in driving accuracy on a golf course that punishes players who hit the ball in the deep, thick rough.

By his own admission, Wolff got some good breaks with lies in the rough. Never was that more apparent than at No. 18, where he hit 4-iron off the tee and his ball somehow bounced from the 5-inch rough into to the first cut, which is much more manageable at about an inch high.

From there, he lasered his 7-iron approach shot onto the green and made the putt for an exclamation-point birdie to close the day and stretch his lead to three at the time.

The question is whether Wolff can sustain those low-percentage fairway numbers in the final round and hoist the chalice by day’s end. History says no. The average score for 54-hole U.S. Open leaders at Winged Foot is 76.8 with no player shooting better than 74.

So, the task is far from complete for Wolff.

“It’s golf … anything can happen, especially at a course like this,’’ Wolff said. “I know if I keep calm and not let my emotions get the best of me, I should have a really good chance. I feel like I’m ready to win out here and win a major. I’ve already won a PGA Tour event and I knew my game was in a really good spot. Yes, it is really early in my career, but I feel like I have the game to win.

“Collin won at 23. I’m 21. I’m not saying that it’s going to happen, but I put myself in a really good spot, and obviously I’m feeling really good with my game, so I’m just going to keep on doing what I’m doing and whatever happens, happens.’’