There were 14.7 million brackets entered in ESPN's Tournament Challenge prior to the start of the NCAA tournament. After just 16 games, only 108 remain unblemished.

Ever fill out a March Madness bracket and wonder why certain numbers are left of college names? Those are seeds and here’s why they’re important to the NCAA tournament.

Bracket fever has hit ESPN! We have our own Tournament Challenge group, and you can check it out. First, you'll need to log on to the Challenge main page with your entry, then check out the Featured ...