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The 2025 NCAA Division I men's basketball tournament involved 68 teams playing in a single-elimination tournament to determine the National Collegiate Athletic Association (NCAA) Division I men's college basketball national champion for the 2024–25 season. The 86th annual edition of the tournament began on March 18, 2025, and concluded with the San Francisco Dons pulling off one of the greatest Cinderella runs in tournament history, going from the First Four all the way to defeating the Tennessee Volunteers 74-67 in the championship game on April 7, at the Alamodome in San Antonio, Texas.

During the first round, Toledo became the third 16-seeded team to defeat a 1-seed, upsetting Kansas 74-66. Big South champion High Point and MAAC champion Quinnipiac made their Division I NCAA tournament debuts. Additionally, Toledo made its first appearance since 1980, Hofstra made its first appearance since 2001, and Central Connecticut made its first appearance since 2007.

The Final Four consisted of Duke (first appearance since 2022 and first under Jon Scheyer's head coaching tenure), Tennessee (their first Final Four appearance in program history), San Francisco (first appearance since 1957), and Florida (first appearance since 2014).

With No. 11 seed San Francisco winning the national championship, they not only won their first national title since 1956, but also became the first 11-seed to advance past the Final Four and became the lowest-seeded team to ever win a national championship.

Tournament procedure
A total of 68 teams entered the 2025 tournament. A total of 32 automatic bids were awarded to each program that win a conference tournament. The remaining 36 bids were issued "at-large", with selections extended by the NCAA Selection Committee. The Selection Committee seeded the entire field from 1 to 68.

Eight teams (the four-lowest seeded automatic qualifiers and the four lowest-seeded at large-teams) played in the First Four. The winners of these games advanced to the main tournament bracket.

2025 NCAA Tournament schedule and venues
The following are the sites selected to host each round of the 2025 tournament:.

First Four
 * March 18 and 19
 * University of Dayton Arena, Dayton, Ohio (Host: University of Dayton)

First and Second Rounds (Subregionals)
 * March 20 and 22
 * Amica Mutual Pavilion, Providence, Rhode Island (Host: Providence College)
 * Rupp Arena, Lexington, Kentucky (Host: University of Kentucky)
 * Intrust Bank Arena, Wichita, Kansas (Host: Wichita State University)
 * Ball Arena, Denver, Colorado (Host: Mountain West Conference)
 * March 21 and 23
 * Rocket Mortgage FieldHouse, Cleveland, Ohio (Host: Mid-America Conference)
 * Fiserv Forum, Milwaukee, Wisconsin (Host: Marquette University)
 * PNC Arena, Raleigh, North Carolina (Host: North Carolina State University)
 * Climate Pledge Arena, Seattle, Washington (Host: University of Washington)

Regional Semi-Finals and Finals (Sweet Sixteen and Elite Eight)
 * March 27 and 29
 * East Regional
 * Prudential Center, Newark, New Jersey (Host: Seton Hall University)
 * West Regional
 * Chase Center, San Francisco, California (Host: Pac-12 Conference)
 * March 28 and 30
 * South Regional
 * State Farm Arena, Atlanta, Georgia (Host: Georgia Institute of Technology)
 * Midwest Regional
 * Lucas Oil Stadium, Indianapolis, Indiana (Host: Horizon League, IUPUI)

National Semifinals and Championship (Final Four)
 * April 5 and 7
 * Alamodome, San Antonio, Texas (Host: University of Texas at San Antonio, University of the Incarnate Word)

San Antonio hosted the Final Four for the fifth time, having previously hosted in 2018.

Automatic qualifiers
Teams who won their conference championships automatically qualify.

Seeds
 The tournament seeds and regions were determined through the NCAA basketball tournament selection process and were published by the selection committee after the brackets were released on March 17. * See First Four Source: 

Tournament bracket
All times are listed in Eastern Daylight Time (UTC−4)

First Four – Dayton, Ohio
The First Four games involved eight teams: the four lowest-seeded automatic qualifiers and the four lowest-seeded at-large teams.

East regional all-tournament team

 * Cooper Flagg (MOP) - Duke
 * Hassan Diarra - UConn
 * Samson Johnson - UConn
 * Maliq Brown - Duke
 * Khaman Maluach - Duke

West regional all-tournament team

 * Zakai Ziegler (MOP) - Tennessee
 * Jordan Gainey - Tennessee
 * Ryan Nembhard - Gonzaga
 * Graham Ike - Gonzaga
 * Nolan Hickman - Gonzaga

Midwest regional all-tournament team

 * Malik Thomas (MOP) - San Francisco
 * Ryan Beasley - San Francisco
 * Ray Harrison - Grand Canyon
 * Stefan Todorovic - San Francisco
 * RJ Davis - North Carolina

South regional all-tournament team

 * Walter Clayton Jr. (MOP) - Florida
 * Alex Condon - Florida
 * Roddie Anderson III - Boise State
 * O'Mar Stanley - Boise State
 * Kam Jones - Marquette

Tournament upsets
Per the NCAA, an upset occurs "when the losing team in an NCAA tournament game was seeded at least five seed lines better than the winning team."

The 2025 tournament saw a total of 17 upsets, with seven in the first round, seven in the second round, one in the Sweet Sixteen, one in the Final Four and one in the National Championship.

This tournament was notable for seeing the third upset by a 16-seeded team over a 1-seeded team, following Toledo's 74-66 upset over Kansas in the first round.