Bracket buster, as a generic phrase, refers to an American college basketball team, usually from a so-called mid-major school, which upsets a highly ranked team in the NCAA Men's Division I Basketball Tournament. The 2010 tournament featured many bracket busters. In the second round, a ten seed (St. Mary's) defeated a two seed (Villanova) while Northern Iowa, a nine seed, defeated the overall top seed, Kansas. In ESPN's bracket challenge, over 42% picked Kansas to win the tournament, making Northern Iowa's upset one of the biggest in many years.