Less than 1 percent of brackets remain perfect after Day 1

While the first day of March Madness action may not have featured much in the way of upsets, it's still pretty difficult to predict every matchup correctly.

That is proven by the number of perfect brackets, or more accurately the lack of perfect brackets, that remain after the first 16 games.

The 154,283 perfect brackets left represents less than one percent of the total submitted to ESPN.

While it's believed the odds of predicting a perfect bracket are somewhere between 1 in 128 billion and 1 in 9.2 quintilian, it's surprising that after a day where favorites ruled, so few brackets got it all correct.