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.

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

Fewer than 1% of NCAA Tournament brackets were still perfect after Thursday’s 16-game slate, according to several services where fans attempt the all-but impossible task of predicting every March Madness game correctly — or, barring that, win their office pools.