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.

Caesars Sportsbook is a top option for March Madness bettors for several reasons. It has tons of odds boosts and frequent promos related to March Madness, plus a great welcome offer for new customers that gives you 10 100% profit boosts for betting $1+ after signing up when you use the Caesars March Madness promo code FORBES1000.