Upset special

Bracket contests are rarely won or lost on the first weekend, but it sure is fun to be the guy who picked the right 12-5 upset or maybe even a No. 13 vs. a No. 4. If you're really greedy, you can go for the No. 15 over a No. 2, keeping in mind it doesn't happen very often.

But if you were, say, inclined to pick some upsets, where would you be wise to look?