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All that talent at Arizona and Michigan. All that momentum and good vibes at UConn. And somebody has to be play the part of the unheralded “little guy.” At the Final Four next weekend, that role belongs, improbably, to Illinois.

In a sign of the times, the Illinii — a Big Ten team with more wins in the conference over the last seven seasons than any other program — will pass for something resembling Cinderella when college basketball’s biggest party kicks off in Indianapolis on Saturday.

The first challenge for coach Brad Underwood’s team will be stopping a hard-charging UConn juggernaut. After being down by as many as 19 on Sunday, Braylon Mullins retrieved a loose ball near midcourt in the waning seconds against Duke and suddenly, improbably, UConn had a chance to win.

As the frantic final seconds unfolded, Huskies coach Dan Hurley figured a timeout would do little good.

“It just felt like the window where you’ve just got to let March Madness take over,” Hurley said. “March magic.”

The Huskies have enjoyed plenty of that through the years, and this may have been their most astonishing win yet. Mullins sank a desperation 3-pointer with 0.4 seconds left to give UConn a 73-72 victory over top-seeded Duke, earning the Huskies a spot in the Final Four.

The Blue Devils (35-3) led by three before UConn’s Silas Demary Jr. made one of two free throws with 10 seconds left. With Duke playing keep-away to prevent the Huskies from fouling, Cayden Boozer’s pass near midcourt was deflected by Demary, and after UConn came up with the ball, Mullins swished a 3 from 35 feet away.

The last two times the Huskies reached this point, they won the championship.

“It’s a UConn culture, a UConn heart,” Hurley said. “We believe we’re supposed to win this time of year.”

All these teams do.

Arizona, led by Brayden Burries, and Michigan, with Yaxel Lendeborg, have up to nine NBA prospects between them.

The Wildcats opened as slight favorites — at plus-165 to win the championship, according to BetMGM Sportsbook. That was a shade ahead of the Wolverines, who are plus-180 after their 95-62 romp over Tennessee on Sunday.

But, in one of a few strange twists on the odds chart, the Wildcats are 1 1/2-point underdogs to Michigan in Saturday night’s second semifinal.

Illinois is a 2 1/2-point favorite over UConn and, in reality, it’s the Huskies, at plus-550, who are the biggest long shot in Indy.

Even so, the fact that Illinois — the flagship university in the nation’s sixth most populous state and a school with an enrollment of nearly 60,000 — feels most like this year’s out-of-nowhere underdog speaks more about the current state of college hoops than the Illini themselves.

They are a No. 3 seed — the highest number at the Final Four in two years. (UConn is a 2. Last season, all four No. 1s made it.)

This year’s meeting of 1 vs. 1 — Michigan vs. Arizona — is a heavyweight matchup of power teams from power conferences.

It’s a far cry from a mere three years ago, when mid-majors Florida Atlantic (coached by Dusty May, who now leads the Wolverines) and San Diego State crashed college basketball’s biggest party.

Since then, NIL and the transfer portal have redefined the contours of player movement, another spasm of realignment has made the big conferences bigger (Arizona, now in the Big 12, was in the Pac-12 in 2023), and the high-achieving underdogs that used to make March Madness what it is have gone into a slump.

Double-digit seeds won a total of five games in this tournament (not counting the play-in round). Two years ago, they won 11 and sent one team (N.C. State) to the Final Four.

Not surprisingly, Underwood — the coach who landed on the Illinois radar a decade ago by coaching double-digit seed Stephen F. Austin to a pair of upset wins in the tournament — views his program’s trip to the Final Four more as destiny than a once-in-a-lifetime story.

It is, however, the first trip for Illinois since 2005, when it lost to North Carolina in the title game.

“I don’t want to sound arrogant,” said Underwood, whose teams have won 96 Big Ten games since 2019-20, two more than Purdue. “I’ve never doubted us getting to a Final Four would happen. I have thought we have had other teams capable. But I also know how doggone hard it is to do it.”

The Big Ten knows all about this. Both Illinois and Michigan have a chance to deliver a title for the conference for the first time since Michigan State won it all in 2000.

The Illini, led by the so-called “Balkan Bloc” — a cohort of players with roots in Eastern Europe — have a potential NBA lottery pick of their own in guard Keaton Wagler.

Even so, the best-known name on the Illini roster might be Andrej Stojakovic, whose father, Peja, was a three-time NBA All-Star. Illinois is the third school in three years for the younger Stojakovic, who spent one season at Stanford and another at Cal before joining Underwood’s crew.

The task for Illinois: Figuring out who to key on across a roster that has five players who average double figures, led by Tarris Reed Jr.

The Wildcats-Wolverines game is a high-powered matchup of programs that have shown there’s more than one way to amass talent in the era of the unlimited transfer portal and big-money name, image and likeness deals.

Four of the five starters for Tommy Lloyd’s Wildcats began their careers in Tucson; the fifth, Big 12 player of the year Jaden Bradley, moved over from Alabama and has been with the Wildcats for three years.

Meanwhile, the top four players in minutes played at Michigan — Lendeborg, Morez Johnson Jr., Aday Mara and Elliot Cadeau — all arrived from the transfer portal.

In a twist that makes perfect sense these days, both coaches parlayed roots in the mid-majors to a spot on the sport’s biggest stage. Lloyd spent decades as a top assistant for Mark Few at Gonzaga before heading to Arizona to rebuild the program after the ouster of Sean Miller in 2021.

May led FAU to the Final Four before heading to the Michigan program that had thrived, then collapsed, under former Fab Five star Juwan Howard.