MINNEAPOLIS -- It took only three big swings of the bat to swing the momentum of Sunday’s game -- and the Twins hope that, at last, the momentum of their season is also trending up for good.

Carlos Correa’s clutch two-run single off Arizona ace Zac Gallen helped the Twins erase an early deficit before homers from Max Kepler and Matt Wallner off closer Paul Sewald erased a late one -- and the first walk-off of Wallner’s career catapulted the Twins to a 5-3 victory at Target Field that secured a three-game sweep of the D-backs, fueled by an offense whose confidence grows by the day.

“A sweep is always good, no matter what,” Wallner said. “It gives us momentum going into this road trip and then just confidence as a team going forward, stretching the division lead out more for now, and keep that, because the more, the better.”

That division lead, by the way? It’s now bigger than ever, as the Twins’ ninth walk-off win of the year coupled with a Guardians loss to the White Sox pushed Minnesota to a season-high 4 1/2 games up in the American League Central, the second-largest divisional lead in MLB.

The Twins trailed by a run entering the bottom of the ninth against Sewald, the D-backs’ big acquisition at the Trade Deadline -- but that was a short-lived deficit, as Kepler mashed a first-pitch fastball a Statcast-projected 438 feet to go deep for a third straight game and tie it, 3-3.

A Jorge Polanco pinch-hit walk gave way to Wallner, who took a strike, then crushed a four-seamer off the facing of the second deck in right-center field for a 415-foot walk-off that gave the Twins their fourth win of the season when trailing after eight innings.

“He’s a big boy and hits the ball so hard,” manager Rocco Baldelli said of Wallner. “I mean, really. But he’s under control. He’s never really out of control. It’s a controlled, violent swing. And he’s been doing this. That swing today just now, that’s not new. We’ve seen him doing this. He works incredibly hard.”

Wallner had to be patient for much of this season, pushed to Triple-A for large chunks of the schedule by the Twins' logjam of left-handed corner outfielders. But like Edouard Julien before him, he's forcing the organization's hand with his productivity, slashing .238/.333/.571 with six homers since his most recent callup on July 15.

The Twins had to be similarly patient with Kepler, whose rough 2021 and '22 seasons and another tough start to '23 have given way to some of the finest baseball of his career, with an .894 OPS since the start of July, with more batted balls to all fields, strong defense and, recently, upped power.

And, of course, Correa's season has required patience, too, with some of the worst offensive numbers of his career leading to two more double-play grounders on Sunday -- pushing his total to an MLB-leading 22 -- before that go-ahead, two-run single off Gallen in the sixth gave him a tangible moment of progress to appreciate.

“I've been struggling all year, that's no secret,” Correa said. “I'm not going to put my head down and just give up and just say, 'Ah, I'll come back next year and I'll do it for the next five or so years.'

“My mentality is just to go out there and figure it out every single day, keep working and working and finish strong. And then hopefully, we make the playoffs and you can go off there, and it'll all be worth it.”

This has been a second half of streaks for the Twins. They came out of the All-Star Break hot, winning nine of their first 11, then lost five in a row before this recent uptick in which they've won five of six against St. Louis and Arizona.

But for the first time, armed with resilient hitters, their most productive youngsters and their biggest division lead of the year, it seems like the Twins are able to smell blood in the water in those big moments -- and that confidence showed on Sunday.

“Kepler got, I think it was the first pitch, he hit it out, and it's like, 'Oh, OK. We're here to go to maybe extras, but we're going to win it now,'” Julien said. “Sewald pitched yesterday, and it was two days in a row, and I knew when Wallner came up that he was going to hit a home run.”