The first day of the NCAA tournament was a Giant Killer thriller, and not just because seven teams, including four double-digit seeds, pulled upsets. Even better, the triumphs came from squads that profiled as successful underdogs, not flukes. So far, teams we picked as “Best Bets” are 1-0 (with Wichita State getting the win), while those who were “Worth a Long Look” are 3-1; “Not Completely Crazy” picks are 0-5 (with Killers outscored by an average margin of 15.8 points); and “Stay Away” teams are 0-3 (average margin: 26 points).

Best of all, if you enjoy bracket carnage -- and if, as we recommended, you made sure to keep an eye on second-round matchups when you chose your pool -- the Davids who won yesterday are well-equipped to keep toppling Goliaths. Our model sees at least one more upset coming on Saturday.

So far, four programs -- Yale, Arkansas-Little Rock, Wichita State and Gonzaga -- are stepping toward Cinderella status. They are all legitimately strong teams: All four rank in KenPom’s top 41 nationally, and now all four are heading into favorable stylistic matchups. Here’s what we know: