The 2025 men's NCAA tournament began with 68 teams looking to raise a banner and write their name into college basketball history. The Auburn Tigers, the overall No. 1 seed in the South, are looking to avenge their SEC tournament loss and claim the title as the best team in the country.

Many in legalized sports betting states who filled out brackets in ESPN’s ubiquitous tournament challenge contest this week were greeted by a congratulatory pop-up fronted by falling confetti after they hit the submit button -- along with an invitation to wager on their chosen winner at ESPN Bet, with odds for that team featured prominently.

A look at the best March Madness betting promos for first- and second-round action, including top offers from bet365, BetMGM and more.