The first day of March Madness brought upsets, blowouts and an action-packed 13 hours of college basketball. Below is your guide to all 16 first-round games from Day 1 of the men's 2025 NCAA tournament, complete with analysis from on-site reporters of how each game was won, and our experts' takes on each winner's chances to advance to the Sweet 16.

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.

Fewer than a million perfect brackets remained on ESPN and just over a million were left on the NCAA's platform midway through the first day of the NCAA Tournament on Thursday. ESPN's perfect bracket tracker listed 806,