Perhaps the most interesting and exciting games of the tournament are played in the first weekend.
The format has changed a little this year, but the match-ups on Thursday through Saturday should be just as compelling.
While a 16-seed has never won an opening round game (and maybe never will), four 15-seeds have, instilling in those underdogs the belief that it can be done.
Heavyweights like Kansas, Arizona and Indiana appear more than once on the list of big names that have fallen on the first day.
This is bound to happen because they are almost always a high seed, and sometimes, the gap between being third best in your power conference and being the best in your mid- or low-major conference doesn't seem to be that great.
This season, perhaps more than any other, true upsets might be rare. The parity that this college basketball season has seen has been like no other, and while there are probably two handfuls of teams that could win the whole thing, it would hardly be surprising to see virtually anyone beat anyone else.
And now, 20 of the biggest upsets in the history of the opening round.