Princeton (13) gave Kentucky (4) a run for their money, but in the end the Ivy League champs fell short in the final seconds. (AP)

Bracket busting can be heartbreaking, but what would March Madness be without a couple of upsets? 13-seed Morehead State was the first giant-killer, taking down 4-seed Louisville. Then 11-seed Gonzanga toppled the Southeast region’s sixth seed, St. John’s. What other teams are at risk? Bill talks with ESPN.com’s Pat Forde about what to expect from the second and third rounds of the tournament.