The 2021 NCAA men's basketball tournament is here. At long last, after a 23-month wait. The March Madness bracket reveal is complete, with some unsurprising news at the very top of it: Gonzaga is the No. 1 overall seed.

The Bulldogs enter the tournament undefeated, and as the betting favorite to win the national title — +300 at BetMGM. They went wire-to-wire as the No. 1 team in the AP poll.

Baylor earned the second No. 1 seed. Illinois earned the third and No. 1. Michigan got the fourth.

On the bubble, Syracuse, Michigan State, UCLA, Wichita State, Drake and Utah State are all in.

Louisville, Colorado State, Saint Louis and Ole Miss were the first four teams left out, in that order. They'll be on standby if any COVID-19 outbreaks require replacement teams between now and 6 p.m. ET on Tuesday.

The full bracket is below, and Yahoo Tourney Pick 'Em is open.

(Note: Region names are merely procedural. The entire tournament will take place in Indiana. The West is the upper-left quadrant. The South is the upper-right. The Midwest is the bottom-right. The East is the bottom-left.)

West Region

1. Gonzaga
16. Norfolk State/Appalachian State

8. Oklahoma
9. Missouri

5. Creighton
12. UC Santa Barbara

4. Virginia
13. Ohio

6. USC
11. Drake/Wichita State

3. Kansas
14. Eastern Washington

7. Oregon
10. VCU

2. Iowa
15. Grand Canyon

South Region

1. Baylor
16. Hartford

8. North Carolina
9. Wisconsin

5. Villanova
12. Winthrop

4. Purdue
13. North Texas

6. Texas Tech
11. Utah State

3. Arkansas
14. Colgate

7. Florida
10. Virginia Tech

2. Ohio State
15. Oral Roberts

Midwest Region

1. Illinois
16. Drexel

8. Loyola
9. Georgia Tech

5. Tennessee
12. Oregon State

4. Oklahoma State
13. Liberty

6. San Diego State
11. Syracuse

3. West Virginia
14. Morehead State

7. Clemson
10. Rutgers

2. Houston
15. Cleveland State

East Region

1. Michigan
16. Mount St. Mary's/Texas Southern

8. LSU
9. St. Bonaventure

5. Colorado
12. Georgetown

4. Florida State
13. UNC Greensboro

6. BYU
11. Michigan State/UCLA

3. Texas
14. Abilene Christian

7. UConn
10. Maryland

2. Alabama
15. Iona

More NCAA tournament on Yahoo Sports:

• NCAA tournament bracket revealed: Gonzaga nabs No. 1

• Play this year’s Yahoo Fantasy $50K Tourney Pick’em contest

• Wetzel: How COVID impacts NCAA tournament

• What the NCAA selection committee got right and wrong

• Louisville, Duke among this year’s tourney snubs

• Selection Sunday winners and losers

• Virginia players quarantined until March Madness

• NCAA tourney breakdowns: West | South | Midwest | East

• NCAA snubs Duke, Louisville turn down NIT

• Wichita State elated after surviving NCAA bubble

• NCAA betting: 5 takeaways from conference tourneys

• NCAA betting: 5 teams whose odds just went up