MARCH MADNESS: UConn, Purdue, Houston and North Carolina headline No. 1 seeds for NCAA Tournament... as the most unpredictable postseason field of all-time is revealed

UConn earned the No 1 overall seed in the NCAA Tournament after winning a national championship last season.  

Purdue, Houston and North Carolina rounded out the field of 68's top seeds, with the entire tournament field being revealed Sunday night. 

Tournament projections varied more this season than ever before, with Florida Atlantic thought to be barely hanging on to an at-large bid but received a No 8 seed. 

On the other side of that coin, Boise State had plenty of quality wins, but ended up as one of the last four teams to make it into the field of 68, despite many thinking the Broncos had room to spare away from the bubble. 

Four teams won 30 games this season in Division I, with all of them either earning No 1 seeds, UConn or Houston, or No 12 seeds, James Madison or McNeese State.  

UConn is the defending national champion and earned a No 1 seed in this year's bracket

After losing as a No 1 seed last season in the first round, Purdue is again a top seed in March

The NCAA Tournament will begin Tuesday night with a pair of 'First Four' games, with the first full slate of games with different seeds facing each other on Thursday. 

Purdue was the No 1 overall seed last season, but fell in the first round to Farleigh Dickinson. This season, the Boilermakers will play the winner of Grambling State and Montana State in the first round. 

The three top seeds of Purdue, UConn and Houston looked like locks before the weekend began, with North Carolina hanging on to be the final No 1 seed despite not winning the ACC Tournament. 

Teams who had their bubbles burst include Oklahoma, St. Johns, and Indiana State. 

Big East contenders Providence and Seton Hall are also not part of the tournament field. 

The No 2 seeds are Iowa State, Tennessee, Marquette, and Arizona. 

NCAA Selection Committee Chairman Charles McClelland said there were five bid-stealers this season, meaning if those teams did not win their conference tournaments, they would not have been in the field of 68. 

Most notorious in that quintet was New Mexico, who won the Mountain West Conference Tournament on Saturday. 

In theory, that means Richard Pitino's team may have cost his father's new squad, Rick Pitino led-St. John's, an NCAA Tournament spot.