Best MLB Betting Promos For NLCS, Arizona Diamondbacks Fans

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Written By Brett Gibbons on October 18, 2023
mlb betting promos

For the first time since 2007, the Arizona Diamondbacks are in the NLCS! To gear up for the championship series, Arizona’s top sportsbooks released a slew of MLB betting promos for new users. Capitalize on up to $4,161 worth of bonuses and bet insurance when you sign up for any of the sportsbooks below. The NLCS continues Thursday, Oct. 19, as the D-Backs take on the Philadelphia Phillies in Game 3 with a spot in the World Series on the line. Browse all the bonus codes in this article and pair them with MLB Playoff odds to maximize your potential winnings.

Compare promos from the best sports betting sites. Click PLAY NOW to get started with one of them today:

Up to $250
Bonus Bet with First Wager
First Bet Reset Up to $250 Back in Bonus Bets 
Get Betway Boosts & Enhanced Odds
To Claim: Click Play Now
$1,000 FIRST BET
On Caesars
Up to $1,000 Back as a Bonus Bet if Your Bet Loses
Stream NFL Games In-App for Free
21+ Gambling problem? Call 1-800-GAMBLER
Use Promo Code: THELINES1000
UP TO $1,500
In Bonus Bets
$1,500 Paid Back in Bonus Bets
Free Live Streaming – Watch Live Games
Use Bonus Code: THELINES
UP TO $105
On Fred
No Sweat Bet, up to $105, if Your First Wager Loses 
Daily Odds Boosts
21+. Gambling Problem? Call 1-800-NEXT-STEP
Use Promo Code: BETBONUS
$250 bonus
On Deposit
100% Deposit Match Up to $250
Win Tickets to Big Game LVIII in Las Vegas
Parlays, Profit Boosts, and More!
To Claim: Click Play Now
BET $5
get $150
In Bonus Bets
Up to $150 in Bonus Bets if Your Team Wins
Available on Desktop, Android & iOS
To Claim: Click Play Now
$100 BONUS
2nd Chance Bet
Up To $100 in Bet Credits
ONLY 1x Play Through!
Use Exclusive Bonus Code: LINESRIV
$100 bonus
No Regret First Bet
Up to $100 Back if Your First Bet Doesn’t Hit
Get Your Bets Boosted
To Claim: Click Play Now

21+ to play; Gambling problem? Call 1-800-GAMBLER

Best MLB Betting Promos

Arizona SportsbookPromo CodeCurrent Bonus
Betway SportsbookClick to claim Betway promoFirst Bet Reset up to $250 back in bonus bets if your first bet loses.
Caesars SportsbookTHELINES1000$1,000 First Bet on Caesars
BetMGM SportsbookTHELINESUp to $1,500 back in Bonus Bets if you don’t win
BetFred SportsbookBETBONUS$105 on Fred (No Sweat Bet up to $105 if your first wager loses)
Desert Diamond SportsbookDesert Diamond Sportsbook100% Deposit Match up to $250
FanDuel SportsbookClick to claim FanDuel promoBet $5 on any Money Line, Get $150 in Bonus Bets if Your Team Wins
BetRivers SportsbookLINESRIV$100 Bonus Second Chance Bet
Hard Rock Bet SportsbookNone, click to claim promoNo regret first bet up to $100

Note that you must give out some personal information when signing up for sportsbooks. Books will ask for your legal name, street address, birth date, and the last four digits of your social security number to verify your identity. At TheLines, we strongly encourage using a secure wireless network when inputting sensitive information like personal identifiers and bank account numbers. Must be 21+ to bet in Arizona.

Betway Sportsbook: Get Up To $250 Bonus

Sign up with BetWay Sportsbook and opt-in to get your first wager back up to $250 should it lose. With this promo, you can be confident knowing your first bet will be refunded in bonus bets with Betway’s First Bet Reset. No promo code is necessary to claim, but be sure to use any bonus bets within seven days, or they expire!

Caesars Sportsbook: Up To $1,000 Bet Insurance

Like the previous promo, Caesars Sportsbook offers up to $1,000 in bet insurance for your first wager. Like many other bet credits, be sure to use them within seven days of issuance or they expire. Be sure to use promo code TheLines1000 at initial deposit to opt into this promotion!

BetMGM: Get Up To $1,500 Back In Bonus Bets

If $250 or $1,000 wasn’t enough, BetMGM Sportsbook offers up to $1,500 in bet insurance on your initial wager! Use bonus code TheLines with your first deposit to be eligible for this promotion.

BetFred Sportsbook: Get Up To $1,111 Bonus

BetFred Sportsbook offers new users multiple bonuses at signup. Place your first wager of $50 and receive $111 in bonus bets instantly! Also, BetFred gives its new users up to $200 per week for five weeks, covering 50% of all your combined wagers per week (max. $200). Be sure to track your inbound bonus bets and issuance dates, as they expire within seven days. Use bonus code BetBonus at deposit to opt into both promotions.

FanDuel Sportsbook: Bet $5, Get $200

FanDuel Sportsbook offers a simple but exciting promotion at signup: bet just $5 on any wager and instantly get $200 in bonus bets! FD issues these bonus bets in four $50 increments that must be used as $50 bets. Be sure to use them within seven days or they expire from your account. No promo code necessary!

BetRivers: Get $100 In 2nd Chance Bets

Deposit at least $10 with BetRivers Sportsbook and use promo code LinesRIV to opt into this promotion. BetRivers will refund your initial bet should it lose up to $100 once you play through your initial deposited amount. Be sure to use your second-chance bet credit within seven days!

  • Join’s free sports betting Discord with more than 4,000 community members and our staff sharing betting ideas every day. Go to the #roles server to get push notifications to the Discord app from staff when they lock in a bet.

MLB Odds For NLCS Game 3

Compare odds from top sportsbooks for NCLS Game 3 below. Philadelphia leads the best-of-seven series by two games to none. Click on the odds anywhere in the table to place a bet.