DraftKings has firmly cemented itself as one of the best sportsbook in the nation, building off their unbelievable daily fantasy success. So when online sport betting was legalized in the US, they continued their spread and innovative stance.

During the NCAA basketball season, their free-to-play March Madness brackets and pools are one of their best offerings, with two separate bracket challenges running this year - the DK Millionaire Bracket and Zero Right Bracket Challenge.

Not only can you enter a public March Madness bracket with thousands of others, and fill out a bracket for the chance to win huge cash money - you can also set up smaller, private pools for friends, family, and work.

So enjoy the NCAA Tourney with one of the most widely available betting sites in the country - and even snag a great welcome bonus to give you a leg up when betting this spring!

You've certainly heard of this betting site, and for good reason. FanDuel is one of the premier sportsbooks in the country, with a streamlined mobile offering, and super expansive and in depth betting markets.

And of course they have also used their daily fantasy prowess to bring an excellent March Madness Betting experience with a bracket pool and bracket bet insurance.

New users can all claim a fantastic FanDuel March Madness betting bonus of 10x Your First Bet up to $200 in Bonus Bets - thats a heck of a way to start the tournament given there are always first round upsets!

When we talk about why you should try Caesars Sportsbook for March Madness, it's because they have some of the best college basketball promos in the US.

Unlike most betting sites that offer singular promos for events, Caesars Sportsbook excels at changing their promotions daily, giving you the chance to earn a little extra throughout to entire March Madness tournament. These promos can range from parlay insurance to bet & get bonus for specific matchups.

Aide from daily promos, Caesars also features a big Bonus Bets welcome offer, and has offered numerous giveaway promos in the past.

Fanatics Sportsbook is the latest betting site to make our list of March Madness options, and it comes with a ton of great betting options for live and tournament wide wagers.

BetRivers has been very consistent in offering solid odds, easy to claim NCAAB parlay insurance, and regular odds boosts on the betting site, which makes them very appealing for March Madness.

While the BetRivers Bracket Challenge doesn't boast the highest top prize, it's free to play, which makes it just another great way to enjoy the NCAA Tournament.

Additionally, BetRivers frequently puts out betting competitions and promotions for users, with March Madness being a major draw for pools and betting squares games.

Bet365 tends to be more of a global betting brand, but if you're a fan of live betting on March Madness this is without a doubt one of the best betting sites you can find.

Not only are the odds on Bet365 some of the best in the country, you can also take advantage of NCAAB early payout offers to help make sure you profit on March Madness games and avoid buzzer beater upsets. As long as the team you back on the moneyline market leads by 18 at any point, Bet365 will payout as a win!

And let's not forget the fantastic Bet365 Bracket Challenge this year, with a top prize of $10,000,000.

ClutchBet is one of the smaller March Madness betting sites we've featured, but this in no way means they don't offer a solid betting experience and a number of promos to enjoy through March!

Clutch Clash is also a pretty innovative betting feature that lets you wager on key players in a head to head style, taking bets on who will score, assist, or take more rebounds during a game - which is a really fun way to wager on basketball!