Top seeds Gonzaga and Kansas are in. So is little Saint Peter’s, the giant killer and only the third No. 15 seed to make it this far in the NCAA Tournament.

And Coach K’s farewell tour continues as he and his Duke Blue Devils made it to the Sweet 16, too.

All eight of the regional semifinal matchups will be set by late Sunday night, capping a wild opening weekend that so far has seen seven double-digit seeds win in the first round and two of them move on.

This is the second year in a row a No. 15 seed has captured the imagination of basketball fans.

Last year, it was Oral Roberts, which came within a missed 3-pointer at the buzzer from beating Arkansas and going to the Elite Eight. This time, it’s those lovable Saint Peter’s Peacocks, who knocked off Kentucky and Murray State and don’t have a single player that made the All-Metro Atlantic Athletic Conference first team.

East Region

Wells Fargo Center, Philadelphia

Friday-Sunday

The Peacocks (21-11) will face No. 3 seed Purdue or No. 6 Texas. This group of New Jersey toughs won’t be intimidated.

“Everybody keeps saying we can’t do that, we can’t do that, we don’t have this and we don’t have that,” coach Shaheen Holloway said. “We got heart. That’s what matters.”

Two of the college game’s biggest brands, No. 8 North Carolina (26-9) and No. 4 UCLA (27-7), will square off in the other semifinal.

First-year coach Hubert Davis’ Tar Heels are the hottest team in the tournament, having won eight of nine after their rout of Marquette and overtime win over defending champion Baylor. UCLA turned back Akron’s upset bid and rolled past Saint Mary’s.

West

Chase Center, San Francisco

Thursday-Saturday

No. 1 Gonzaga (28-3) plays No. 4 Arkansas (27-8) after overcoming slow starts against Georgia State and Memphis. The Zags had to erase a 12-point deficit early in the second half to get past ninth-seeded Memphis and advance to the Sweet 16 for a seventh straight time.

“From here on out, they’re all tough,” coach Mark Few said.

Arkansas was pushed to the limit by double-digit seeds Vermont and New Mexico State. The Razorbacks struggled offensively in both games but their defense has been nails.

The other West game pits second-seeded Duke (30-6) against the Texas Tech-Notre Dame winner. A hard-earned 85-76 win over Tom Izzo and Michigan State sends Mike Krzyzewski west to his record 26th Sweet 16.

South

AT&T Center, San Antonio

Thursday-Saturday

No. 11 Michigan (19-14), the other double-digit survivor, will face second-seeded Villanova (28-7) in a rematch of the 2018 national championship game won by the Wildcats. Like Saint Peter’s, the Wolverines are a pretty good story, too.

They underperformed in the regular season, coach Juwan Howard was suspended five games for a postgame dust-up with Ohio State and going one-and-done at the Big Ten Tournament made for a nervous Selection Sunday.

Here they are in a fifth straight Sweet 16 after rallying to beat Colorado State and then revving up in the second half to knock out third-seeded Tennessee.

No. 5 Houston (31-5), despite having been bitten hard by the injury bug this season, just keeps rolling along under Kelvin Sampson and will play either No. 1 Arizona or No. 9 TCU. It’s the Cougars’ 14th Sweet 16, and third since 2019.

Sampson’s teams just what it takes to win. They’re top-10 nationally in scoring, they take care of the ball, force turnovers, rebound and get after it on defense. They’ll be a tough out.

Midwest

United Center, Chicago

Friday-Sunday

No. 1 seed Kansas (30-6) will face a physical challenge against No. 4 Providence (27-5), which took care of business against South Dakota State and blew out Richmond. Kansas got all it could handle from ninth-seeded Creighton in the second round and is in the Sweet 16 for the first time since 2018.

The game features an intriguing matchup of big men in the Jayhawks’ David McCormack and the Friars’ Nate Watson.

The other Midwest semifinal pits the Auburn-Miami winner against Iowa State, a 54-49 winner over Wisconsin.