March Madness guide: All No. 1 seeds in Final Four after wins by Houston and Auburn

And then there were 1s.

With wins by Houston and Auburn on Sunday, next weekend's Final Four will have all four No. 1 seeds for the second time in NCAA Tournament history.

The only other time since seeding began in 1979 was in 2008, when Kansas, Memphis, UCLA and North Carolina went to the Final Four — in San Antonio, no less.

This year also marks the first time higher seeds went 12-0 in the Sweet 16 and Elite Eight, capping a year of chalk that ends on the Riverwalk.

Houston gave Tennessee a lesson in defensive dominance, shutting down the Vols for a 69-50 win to reach the Final Four for the seventh time. The Cougars held Tennessee to 15 first-half points and 29% shooting overall, including 5 of 29 from 3.

Auburn survived an injury scare to star forward Johni Broome and Michigan State's gritty style to pull out a 70-64 win in the South Region final. Broome left the court with a right elbow injury and returned a few minutes later to finish with 25 points and 14 rebounds. Coach Bruce Pearl's Tigers are in the Final Four for the second time, having gotten there in 2019.

Florida was the first team to reach the Final Four with an 84-79 win over Texas Tech in the West Region final on Saturday. Duke followed by shutting down high-flying Alabama for an 85-65 win in the East Region final.

That sets up an all-Southeastern Conference national semifinal between Florida and Auburn, with Houston facing Duke in the other.

May the best 1 win.

Houston (34-4) vs. Duke (35-3). The nation's best defensive team will face one of its best on offense. Houston has dominated defensively under coach Kelvin Sampson and this season led the nation in points allowed at 58.5 per game. The Cougars were at their smothering best in the Elite Eight against Tennessee, holding the Vols nearly 25 points below their scoring average. Houston has some offense to go with it. The trio of L.J. Cryer, Emanuel Sharp and Milo Uzan can take over any game at any moment. The Cougars will face their tallest order of the season against the big, athletic Blue Devils. Duke has length at every position and its own players who can fill it up, led by All-America freshman Cooper Flagg. The Blue Devils aren't too shabby on defense, either, evidenced by their shutdown of Alabama, the nation's highest-scoring team, in the Elite Eight.

Auburn (32-5) vs. Florida (34-4). The Tigers won the SEC regular-season title. The Gators took the SEC Tournament title. The winner of this one gets a shot at a national title. Auburn was arguably the nation's best team during the regular season, spending eight straight weeks at No. 1 in the AP Top 25. The Tigers lost three of four heading into the NCAA Tournament, but found their groove again at the right time. A first-team All-American, Broome dominated throughout the bracket and provided a lift in the second half when he left after an awkward fall against Michigan State. Florida is back in the Final Four for the first time since 2014 with one of the nation's most balanced teams. The Gators have plenty of size to disrupt opposing offenses and All-American guard Walter Clayton Jr. has proven to be one of the game's most clutch players, as he proved with two late 3s against Texas Tech.

Every game of the men’s tournament will be aired — here is a schedule — either on CBS, TBS, TNT or TruTV and their digital platforms, including Paramount+. CBS will broadcast the Final Four and national title game. The NCAA will also stream games via its March Madness Live option.

Duke is the favorite to win the title at minus-110, according to BetMGM Sportsbook. Florida is next at plus-300, Houston is plus-400 and Auburn plus-500.

The Final Four is in San Antonio on Saturday, April 5, with the championship game April 7.

AP March Madness bracket: https://apnews.com/hub/ncaa-mens-bracket and coverage: https://apnews.com/hub/march-madness. Get poll alerts and updates on the AP Top 25 throughout the season. Sign up here.

Auburn's Tahaad Pettiford, left, and Miles Kelly (13) celebrate a win over Michigan State after the Elite Eight of the NCAA college basketball tournament, Sunday, March 30, 2025, in Atlanta. (AP Photo/Brynn Anderson)

Houston's Mylik Wilson (8) falls over Purdue's Trey Kaufman-Renn (4) while reaching for a ball during the second half in the Sweet 16 of the NCAA college basketball tournament Friday, March 28, 2025, in Indianapolis. (AP Photo/AJ Mast)

Michigan State head coach Tom Izzo watches play against Mississippi during the first half in the Sweet 16 of the NCAA college basketball tournament, Friday, March 28, 2025, in Atlanta. (AP Photo/George Walker IV)

The Auburn bench celebrates during the second half in the Sweet 16 of the NCAA college basketball tournament against Michigan, Saturday, March 29, 2025, in Atlanta. (AP Photo/George Walker IV)

Texas Tech head coach Grant McCasland celebrates after winning in overtime in the Sweet 16 of the NCAA college basketball tournament game against Arkansas, Thursday, March 27, 2025, in San Francisco. (AP Photo/Godofredo A. Vásquez)

Creighton center Ryan Kalkbrenner (11) moves the basket against Louisville guard J'Vonne Hadley (1) during the first half in the first round of the NCAA college basketball tournament, Thursday, March 20, 2025, in Lexington, Ky. (AP Photo/Brynn Anderson)

SIU Edwardsville guard Declan Dillon (5) tried to get possession of the ball against Houston during the first half in the first round of the NCAA college basketball tournament, Thursday, March 20, 2025, in Wichita, Kan. (AP Photo/Travis Heying)

Purdue forward Trey Kaufman-Renn, top, battles High Point forward Simon Hildebrandt for the ball during the second half in the second round of the NCAA college basketball tournament, Thursday, March 20, 2025, in Providence, R.I. (AP Photo/Steven Senne)

SIU Edwardsville forward Kyle Thomas, right, dives for a loose ball against Houston forward Joseph Tugler, left, during the first half in the first round of the NCAA college basketball tournament, Thursday, March 20, 2025, in Wichita, Kan. (AP Photo/Travis Heying)

Creighton's Jasen Green (0) dunks during the second half against Louisville in the first round of the NCAA college basketball tournament in Lexington, Ky., Thursday, March 20, 2022. (AP Photo/James Crisp)

Purdue guard Braden Smith (3) celebrates after hitting a 3-pointer against High Point during the second half in the first round of the NCAA college basketball tournament, Thursday, March 20, 2025, in Providence, R.I. (AP Photo/Charles Krupa)

Tennessee guard Zakai Zeigler (5) celebrates after a basket against Auburn during the second half of an NCAA college basketball game in the semifinal round of the Southeastern Conference tournament, Saturday, March 15, 2025, in Nashville, Tenn. (AP Photo/George Walker IV)

Florida guard Bennett Andersen (22) celebrates with fans after a win over Alabama in an NCAA college basketball game in the semifinals of the Southeastern Conference tournament, Saturday, March 15, 2025, in Nashville, Tenn. (AP Photo/George Walker IV)

Virginia Commonwealth forward Christian Fermin celebrates after an NCAA college basketball game in the championship of the Atlantic 10 tournament, Sunday, March 16, 2025, in Washington. (AP Photo/Nick Wass)

NAKHON RATCHASIMA, Thailand (AP) — A new construction accident on a road near Thailand's capital, Bangkok, was reported on Thursday, just 24 hours after a construction crane fell on a moving passenger train in the country's northeast, killing at least 32 people.

There was no immediate official confirmation of deaths in Thursday’s accident, but the Facebook page of Fire & Rescue Thailand, which covers the activities of volunteer firefighters and rescue workers, said at least one person was killed.

The accident occurred at the site of an elevated road construction project.

Meanwhile, the search for survivors from Wednesday’s train accident in Nakhon Ratchasima province has ended, said provincial governor Anuphong Suksomnit. Officials said three passengers listed as missing were presumed to have gotten off the train earlier, but that was still being investigated.

Officials believed there had been 171 people aboard the train’s three carriages, which were being removed from the scene on Thursday.

The latest accident on the outskirts of Bangkok saw a construction crane collapse on the Rama 2 Road elevated expressway in Samut Sakhon province at around 9 a.m., according to the government's Public Relations Department, which added that two vehicles were trapped in the wreckage, which included massive metal girders.

Rescue operations were underway, the statement added.

The construction project, an extension of the Rama 2 Road expressway — a major artery leading from Bangkok — has become notorious in recent years for construction accidents, some of them fatal.

At the train accident scene in Nakhon Ratchasima, work to remove the wreckage continued Thursday, after search and rescue operations concluded Wednesday night. The accident saw a falling crane derail and crush parts of the train under it.

The authorities said the crane that fell was a launching gantry crane, a mobile piece of equipment often used in building elevated roadways.

Narongsak Promta, the provincial police chief of Nakhon Ratchasima, told reporters at the site that police are working to verify the status of all passengers to determine the status of the three people listed as missing.

He said police are still collecting evidence and interviewing relevant parties and have not yet pressed charges against any party.

South Korea's Foreign Ministry reported that one South Korean national, a man in his late 30s, was among the dead. The ministry is providing consular services to the bereaved family.

The two-stage high-speed rail project on which the accident occurred has a total investment cost of more than 520 billion baht ($16.8 billion) and is associated with an ambitious plan to connect China with Southeast Asia under Beijing’s Belt and Road Initiative.

In August 2024, a railway tunnel on the planned route, also in Nakhon Ratchasima, collapsed, killing three workers.

Anan Phonimdaeng, acting governor of the State Railway of Thailand, said the project’s contractor is Italian-Thai Development, with a Chinese company responsible for design and construction supervision.

A statement posted on the website of the company, also known as Italthai, expressed condolences to the victims and said the company would take responsibility for paying compensation to the families of the dead and hospitalization expenses for the injured.

The rail accident sparked outrage because Italthai was also the co-lead contractor for the State Audit Building in Bangkok that collapsed during construction in March last year during a major earthquake.

About 100 people were killed in the collapse, which was the only major structure in Thailand to suffer such serious damage. Dozens of executives were indicted in connection with the disaster but none have yet been tried.

The involvement of Chinese companies in both projects has also drawn attention, as has Italthai and Chinese companies’ involvement in the construction of several expressway extensions in and around Bangkok where several accidents, some fatal, have occurred.

In Beijing, Chinese Foreign Ministry spokesperson Mao Ning said Wednesday the government was aware of the reports about the rail accident and had expressed condolences.

It was not immediately clear which companies were involved in Thursday's road construction accident.

Associated Press writers Wasamon Audjarint in Bangkok and Hyung-jin Kim in Seoul contributed to this report.

Forensic workers inspect the site of a train accident, a day after a construction crane fell into a passenger train in Nakhon Ratchasima province, Thailand, Thursday, Jan. 15, 2026. (AP Photo/Sakchai Lalit)

A cuddly toy lies on the ground at the site of a train accident, a day after a construction crane fell into a passenger train in Nakhon Ratchasima province, Thailand, Thursday, Jan. 15, 2026. (AP Photo/Sakchai Lalit)

A construction crane that collapsed on the Rama 2 Road elevated expressway in Samut Sakhon province, Thailand on Thursday, Jan. 15, 2026. (AP Photo/Arnun Chonmahatrakool)

A construction crane that collapsed on the Rama 2 Road elevated expressway in Samut Sakhon province, Thailand on Thursday, Jan. 15, 2026. (AP Photo/Arnun Chonmahatrakool)

A construction crane that collapsed on the Rama 2 Road elevated expressway in Samut Sakhon province, Thailand on Thursday, Jan. 15, 2026. (AP Photo/Arnun Chonmahatrakool)