There are now 181 perfect brackets left following the conclusion of the first round, according to the NCAA. This is the first time since 2019 that all brackets weren't been busted in the opening round. In last year's tournament, the final perfect bracket was busted in the second-to-last game of Round 1.

This year, more than 24 million NCAA Men's Tournament brackets were made on ESPN. But how many perfect brackets remain?

The odds of achieving a perfect bracket for the college basketball tournament are about 1 in 9.22 quintillion.