Through 40 games and three days of men’s NCAA Tournament competition, somehow, someway, there are still perfect brackets out there.

Those who’ve yet to have a bracket buster have either studied the analytics, received some luck or most likely had a little bit of both to get here after the first day of second-round games.

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Playing in those perfect bracket-makers’ favor has been a somewhat chalky start to March Madness, as only three double-digit seeds won first-round games, with 12-seeded McNeese and 11-seeded Drake falling in the second round on Saturday. 12-seed Colorado State has a chance to bust some brackets on Sunday if it can upset 4-seed Maryland to reach the Sweet 16.

6-seed BYU likely also busted some brackets on Saturday after upsetting 3-seed Wisconsin 91-89 to advance to the Sweet 16 for the first time since 2011.

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It’ll be quite the feat if any of those brackets are still perfect after Sunday’s games, meaning teams correctly picked the winners of 48 games through four days.

Here’s a look at how many perfect brackets remain through the first three full days of NCAA Tournament action:

Men’s March Madness perfect bracket tracker

There are only three perfect brackets remaining on ESPN’s tournament challenge, with 24,388,541 brackets busted through 48 games of action.

Yahoo’s tournament challenge has already been completely busted, with no perfect brackets remaining on its website. The only remaining perfect brackets for any website are on ESPN, as every bracket from CBS, X and USA TODAY have also been busted, according to the NCAA’s website.

At least one bracket will be busted in UConn vs. Florida on Sunday, as one of the remaining brackets has the Huskies advancing with the other two taking the Gators in the game.

It shouldn’t be long until there are no perfect brackets remaining, unless one of the three bracket-makers somehow can predict the future.

Women’s March Madness perfect bracket tracker

There are approximately 3,000 remaining perfect brackets in the women’s NCAA Tournament among major tournament challenge websites, according to the NCAA.

There were around 7,000 perfect brackets left before 8-seed Creighton and 9-seed Illinois played on Saturday, and the Fighting Illini’s win eliminated about 4,000 perfect brackets.