Yes, it's happened several times. In 2004, #25 Utah State was left out. UNLV at #25 was also left out in the 1990's.
In the 1970's, prior to conference tournaments, only one team from each conference made the tournament. So, in 1971 #2 USC did not make it because UCLA was #1 and beat USC twice that year. In 1973, #3 Maryland did not get in because they could not get by NC State.
16 seeded Harvard defeated 1 seed Stanford in the 1998 women's NCAA tournament. That is the only victory by a 16 seed in either the men's or women's tournament.
1998
Rankings are subjective. The NCAA Tournament games are about matchups.
That was Villanova, ranked 8th in the Southeast bracket, when they defeated Georgetown, 66-64, to win the NCAA championship in 1985.
Villanova was the lowest seed to win the tournament as an 8 seed in 1985.
No, Illinois has never won the NCAA Men's Basketball Tournament.
No they have not.
The lowest seed to ever win a NCAA Basketball title was Villanova, ranked seed #8. They won the tournament in 1985. Lower seeds have made it to the Final Four (George Mason and Louisiana State, ranked 11th, made it in 2006 and 1986 respectively) but never won. UCLA in 1980 was ranked 48th and made it to the championship game.
They missed the tournament in 2010. Prior to that they missed in 2003.
NO
Twice
yes