8 Schools have entered the tournament ranked #1 in at least one of the three polls. This has happened 21 times by those 8 teams which are.
In 2006, the third seeded (in the Minneapolis bracket) University of Florida gators defeated the #2 seeded UCLA (in the Oakland bracket) in the national championship. Neither team was a number one seeed
usually by their records and previous tournament performances
Villanova
Michigan was a #3 seed when they won the NCAA Men's Basketball Tournament in 1989.
The higher seed is considered the home team
You have the advantage, or you may be seeded higher in a tournament.
In the March Madness tournament bracket, seeds are used to rank and organize the teams based on their performance and record during the regular season. Higher seeded teams are typically expected to perform better and have an advantage over lower seeded teams. The bracket is set up so that higher seeded teams face lower seeded teams in the early rounds, with the ultimate goal of determining the best team in the tournament.
Kansas was the #6 seed in the Midwest bracket in 1988.
What rank the player is in the world or most likely the tournament. This is chosen by how good their world ranking is. They also take into account past performance, as well as how good the player is on the surface - e.g. in 2005, Andy Roddick was ranked lower than Lleyton Hewitt, but he was seeded 2nd ahead of Hewitt (Federer was obviously seeded first), due to his success at the tournament the previous year (reached the final), and his success on the grass courts at Queens. Seeded players earn a 'seed number' by having a high ranking/good record. The seed 'number' is awarded based on the expectation (usually based on rankings) which indicate how the player might perform in this tournament. The 1 seed would be expected to win the tournament and is usually the highest ranked of all the players in the tournament. The number of seeds in a tournament depends on the number of competitors.
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.
#1 seeded Kansas defeated Kentucky in the second round of the 2007 NCAA Tournament, by a score of 88-76.
The NCAA tournament seeding is determined by a selection committee that ranks the teams based on their performance during the regular season. The teams are then placed in a bracket with higher-seeded teams facing lower-seeded teams in each round. The seeding impacts the teams' paths to the championship by determining who they will play in each round. Higher-seeded teams typically have an easier path as they face lower-ranked opponents, while lower-seeded teams face tougher competition.