Online sportsbooks across the country are putting out some of their best sportsbook promo codes and welcome bonuses, and that means even more perks and offers for players to earn—at no additional cost to them. 

It can be difficult to know where to begin, so we’ve listed the biggest and best offers available for bettors to use right now before they start placing bets. 

Best Betting Promos For MLB

BetMGM MLB Betting Promo

Sign up for a new account using the BetMGM bonus code BOOKIESMARCH and get $200 in Bonus Bets Instantly when you make a $10 pre-game moneyline wager on any team. This deal will run throughout the tournament. Here's how it works:

1. Sign up with the BetMGM bonus code BOOKIESMARCH
2. Bet at least $10 on any team in the March tournament bracket
3. Get $200 in Bonus Bets Instantly

BetMGM March Matchups Betting Promo Terms & Conditions

• Bet at least $10 on any pre-game moneyline
• Get 4 $50 bonus bets (credited generally with 24 hours)
• Bonus bets can only be placed as a single bet (straight bet, parlay etc)
• You have 7 days to use the bonus bets
• Bonus bets have no cash value
• Any winning from bonus bets is immediately withdrawable

If you don't want that offer, you can use the BetMGM bonus code BOOKIES and get a first-bet bonus up to $1,000 (you can't combine the offers). This means that players can choose from any set of odds in any sports betting market and place a real-money wager up to $1,000 on its outcome—and then earn either cash profit on a winning bet or receive bonus bets that equal their original wager if it loses. 

For example, bettors who lose a $700 real-money wager will be awarded five $140 bonus bets for a second chance to get their bets correct. Note that losing bettors will receive a single matching bonus bet if their first wager is less than $50, but that’s still a great deal for bettors looking for some insurance on the first bet they make at BetMGM.

Click the BET NOW button below to begin your BetMGM experience and earn your bonus bets.

Up to $1,500 in Bonus Bets if Your First Bet Loses Promo Code: BOOKIES

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Bonus Bets Expire in 7 Days. One New Customer Offer Only. Must be 21+ to participate & present in OH. In partnership with MGM Northfield Park. Gambling problem? Call 1-800-GAMBLER. Visit BetMGM.com for T&Cs. US promotional offers not available in NY, NV, or Puerto Rico.

Caesars Sportsbook MLB Betting Promo

If you’re trying to go big during March Madness, then the Caesars Sportsbook promo code BOOKIESFULL is what you want to use. The largest potential dollar amount on the board hooks up all new players with first-bet insurance up to $1,250. 

Bettors don’t need to wager that full amount, but it makes sense to take full advantage of a one-time offer. You’ll either earn cash profit on that first real-money wager or receive a single matching bonus bet if your first wager loses. It’s effectively a do-over for new players who start their Caesars Sportsbook experience with an 0-1 record.

On top of that, bettors will receive 1,000 Tier Credits and 1,000 Rewards Credits when they register for a new account—regardless of that first bet’s outcome. It’s an added perk and another reason why Caesars Sportsbook is one of the most highly regarded operators in the industry to use during March Madness.

Hit BET NOW on the link below to qualify for both of these offers with Caesars Sportsbook.

$1,000 First Bet on Caesars Promo Code: BOOKIES1000

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Must be 21+ to participate. T&Cs apply.

DraftKings MLB Betting Promo

Upsets happen all the time during March Madness, but placing just one bet will be highly lucrative when playing with DraftKings this tournament. 

That’s because the DraftKings promo code offer unlocks $150 in bonus bets to new players who register for an account and place a $5 wager on a pregame moneyline. You get the $150 bonus only if your $5 wager wins.

That’s 30 to 1 odds on a single bet of your choosing, a deal that obviously doesn’t come around all that often. What’s nice about this specific offer is that you’ll receive six $25 bonus bets that allow you to test out different bet types and betting markets while you’re trying out DraftKings for the first time. 

And don’t forget you can also earn cash profit on that original moneyline wager, allowing for a nice double dip to kick things off during the Final Four of March Madness.

Start your DraftKings betting by clicking on the BET NOW button to earn your bonus bets.

Bet $5, Get $150 Instantly

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21+ and present in most states. (18+ DC/KY/NH/WY). Void in IA/KS/KY/LA/MD/MI/NJ/NY/TN/VA/VT/ONT. Eligibility restrictions apply. On behalf of Boot Hill Casino & Resort (KS). 1 per new customer. Min. $5 deposit. Min. $5 bet. Max. $150 issued as non-withdrawable Bonus Bets that expire in 7 days (168 hours). Stake removed from payout. Terms: dkng.co/bball. Ends 1/5/25 at 11:59 PM ET. Sponsored by DraftKings. GAMBLING PROBLEM? CALL 1-800-GAMBLER, (800) 327-5050 or visit gamblinghelplinema.org (MA). Call 877-8-HOPENY/text HOPENY (467369) (NY). Please Gamble Responsibly. 888-789-7777/visit ccpg.org (CT), or visit www.mdgamblinghelp.org (MD).

FanDuel MLB Betting Promo

Guarantees are incredibly rare in the sports world—just ask any highly-seeded team that’s been upset in Round 1 of the NCAA Tournament. 

But a guarantee in site credit is exactly what you’ll receive when you sign up for a new account using the FanDuel promo code offer. New players will receive a $1,000 No Sweat First Bet. That means if your first bet loses, you'll get your stake back in the form of bet credits (up to $1,000).

You can earn cash profit on that original wager if it wins, and the site credit can be divided up however bettors choose (all the other operators on this list divide up bonus bets at their discretion). That provides some versatility to bettors when they play with FanDuel, which is known for having some of the best odds boosts during March Madness, too. 

Hit BET NOW on the link below to qualify for this offer and to start your FanDuel experience.

Betway MLB Betting Promo

New customers at Betway can get up to $250 in bonus bets when they sign up now. Just hit the 'Bet Now' link below, sign up and then place a wager (max bet: $250) on a market with odds of at least -300. You'll get up to $250 in bonus bets back from Betway in the amount of your first wager - if it loses. This offer is valid from March 14 through April 3.