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Don't worry: These MLB stars have also already had their brackets busted

The excitement of March Madness comes in like a lion and out ... three hours later if you expected big things from Iowa State.

Less than a few hours into the Round of 64, MLB stars were already taking to Twitter to lament their lack of success in predicting which college basketball teams would stick around this year.

Just before 3 p.m. ET, Iowa State was officially bounced from the bracket by No. 14 seed UAB, much to the chagrin of most of America ... and especially Athletics closer Sean Doolittle.

An hour or so later, it was Georgia State's turn to make most of the country facepalm as they sent No. 3 seed Baylor packing.

If you thought brackets would be safe after the two early upsets, you'd have been wrong because UCLA pulled off the victory over Larry Brown's SMU.

Be sure to check back throughout the tournament -- we'll be keeping track of all the broken-bracket madness and the post-upset Twitter comments here.