Since the start of the 64/65 team field, there have been a total of 96 first round matchups. Of these, an 11 seed has beat a 6th seed 30 times.
This has happened 23 times.
It has not yet occurred in the NCAA Men's Basketball Tournament.
24 times.Seehttp://mcubed.net/ncaab/seeds.shtml
A 15 seed has never played a 1 seed. Normally, a 16 seed is matched against a 1 seed in the first round, and through the 2009 tournament, the 1 seed has won the first round game 100 times out of 100 tries. A 15 seed has beaten a 2 seed four times, but has never advanced beyond the second round.
5 times, and all have lost in the second round (4-88) first round record. Now five times, because Norfolk St (15) beat Missouri (2) in the 2012 NCAA tournament so as of March 16,2012 the 15 seed has beat the 2 seed 5 times and lost 100
12 times.
This has occured 23 times
10
In 2001, Hampton (15) upset Iowa State (2) 58-57. As of March 16th, 2012 the last times were 2012 when it occured twice in the same year. Lehigh (15) upset Duke (2) and Norfolk State (15) upset Missouri (2).
15 times: 1986 (2), 1987, 1988, 1989, 1990, 1991, 1992, 1995 (2), 1997, 1998, and 1999, 2005, 2006. Wake lost to Cleveland State in 2009 INCORRECT: Cleveland State was a 13 seed over a 4 seed Wake Forest in 2009
Not sure exactly how many times, but the most recent time it happened was in 2007 when Baron Davis and the Golden State Warriors (8 seed) upset the Dallas Mavericks (1 seed with the best record in the NBA) in an incredible upset.
Once. They went to the NCAA tournament for the first time in 2012 as a #15 seed.