As of Wednesday, March 18, 2026, the NCAA Tournament field is nearly complete, with the remaining First Four games set to finalize the bracket ahead of Thursday’s First Round. Before diving into the final stretch of the college basketball season, bettors can capitalize on over $7,000 in March Madness betting promos available this week.
These offers can be used on the First Four college basketball slate while unlocking significant bonus value from leading sportsbooks like Fanatics Sportsbook, BetMGM, FanDuel, DraftKings, bet365, Caesars Sportsbook, Hard Rock Bet, and theScore Bet.
Use the sign-up modules below to register for the latest March Madness betting promos and get ready for the First Four, First Round, and the rest of the NCAA Tournament action.
Updated March Madness Betting Promos for First Four Games Today
| NCAAB Sportsbooks | Promo Code |
|---|---|
| Fanatics Sportsbook – Get up to $1,000 Matched in FanCash | ACTION |
| BetMGM – 20% Deposit Match, up to $1,500 in Sports Bonus | TOPTAN1500 |
| FanDuel – Get up to $3,000 Back in Bonus over 10 Days | Click Here |
| DraftKings – Bet $5, Get $200 in Bonus Bets + 100% NCAA Tournament Winner Profit Boost | Click Here |
| bet365 – $365 Bet-and-Get or $1,000 First Bet Safety Net | Click Here |
| Caesars Sportsbook – Bet $1, Double Your Winnings on Next 10 Wagers | ACTION4DYW |
| Hard Rock Bet Promo Code – Get 10 x 100% Profit Boost Tokens | Click Here |
| theScore Bet Promo Code – $1,000 First Bet Reset | ACTNEWS |
First Four Odds & Schedule for March 18
Below is the latest look at the First Four schedule and odds for March 18, featuring the key Prairie View vs. Lehigh and Miami (OH) vs. SMU play-in matchups as teams battle for a spot in the main NCAA Tournament bracket.
| Prairie View Odds | ||
|---|---|---|
| Spread | Total | Moneyline |
+2.5 +100 | 142.5 -110o / -110u | +130 |
| Lehigh Odds | ||
|---|---|---|
| Spread | Total | Moneyline |
-2.5 -122 | 142.5 -110o / -110u | -156 |
| Miami (OH) Odds | ||
|---|---|---|
| Spread | Total | Moneyline |
+7.5 -110 | 162.5 -104o / -118u | +250 |
| SMU Odds | ||
|---|---|---|
| Spread | Total | Moneyline |
-7.5 -110 | 162.5 -104o / -118u | -315 |
First Four Predictions for March 18
Check out my predictions for the two First Four matchups available today:
- Prairie View vs. Lehigh prediction: Lehigh moneyline (+140)
Lehigh offers strong value as a +140 underdog, bringing a disciplined, half-court style that can disrupt Prairie View’s pace. Their ability to execute in set offenses and finish efficiently inside gives them a clear path to controlling the game. They also protect the ball well, limiting transition opportunities for Prairie View. In a tight, win-or-go-home matchup, that composure and structure make Lehigh a live underdog worth backing.
- Miami (OH) vs. SMU prediction: Miami (OH) moneyline (+240)
- Miami (OH) is a live underdog in this First Four matchup, offering strong value on the moneyline at +240. The RedHawks come in as a disciplined, well-coached team that thrives in half-court settings, which can slow down SMU’s preferred pace and keep the game within reach. They’ve also shown the ability to execute late in close games — a key edge in a high-pressure, win-or-go-home scenario. In a single-game setting where variance is higher, backing the underdog with structure and composure like Miami (OH) presents solid value.
Latest March Madness Betting Promos for First Four Games on March 18
Take advantage of the offers below by claiming one sign-up bonus from each sportsbook to unlock over $7,000 in March Madness betting promos for bets on any NCAAB odds from the First Four games today.
Bet on the First Four With Fanatics Sportsbook Promo Code ACTION
The Fanatics Sportsbook promo code ACTION unlocks multiple March Madness betting promos depending on your state. The most popular is the $200 bet-and-get offer, which you can access here. The way it works is simple — bet $5 and receive $200 in FanCash instantly. FanCash can be converted into bonus bets or used on licensed merchandise. This offer is available in AZ, CO, CT, DC, IA, IN, KS, KY, LA, MA, MD, MI, MO, NJ, OH, PA, VA, VT, WV, and WY.
Top BetMGM Bonus Code for March Madness
The BetMGM bonus code TOPTAN1500 provides one of the highest-value March Madness betting promos, offering a 20% deposit match up to $1,500 in bonus funds. These funds can be used on NCAA Tournament games and other major sporting events this week.
How to Get $3,000 March Madness Betting Promo with FanDuel Sportsbook
Don’t miss one of the most valuable March Madness betting promos available right now. Click this link and use the updated FanDuel promo code to bet on the First Four. Over the first 10 days, you can earn up to $300 in bonus bets back daily if your wager doesn’t win.
In Indiana and Virginia, users can access a separate offer that provides up to $1,000 in bonus bets through the module below.
DraftKings Promo Code for NCAA Tournament
Activate one of the top March Madness betting promos with the DraftKings promo code. Place a first bet at -500 odds or longer to receive $200 in bonus bets instantly, along with a 100% Profit Boost Token for NCAA Tournament wagers.
bet365 Bonus Code TOPACTION Leads Today’s March Madness Betting Promos
The bet365 bonus code TOPACTION delivers up to $1,000 in bonus value when you sign up with one of today’s top March Madness betting promos. Choose between a $365 bet-and-get promo or $1,000 First Bet Safety Net in AZ, CO, IA, IN, KS, KY, LA, NC, OH, TN, and VA. Users in PA and NJ can claim a $365 bonus with added casino perks, while IL users can access a $150 bet-and-get offer.
Claim Caesars Sportsbook Promo Code for 10 Profit Boost Tokens
Use the Caesars Sportsbook promo code ACTION4DYW to claim the best March Madness betting promos from Caesars Sportsbook. Sign up with this link, place a $1 first bet, and Caesars Sportsbook provides 10 x 100% Profit Boost Tokens to double your winnings on your next 10 wagers for $25 or less.
Claim 100% Profit Boost Tokens for the First Four With Hard Rock Bet
The Hard Rock Bet promo code offers a strong March Madness betting promo for users in NJ and MI. Sign up to receive 10 100% Profit Boost Tokens, which can be applied to wagers of $50 or less to enhance potential payouts.
Utilize theScore Bet Promo Code ACTNEWS to Bet on March Madness
Sign up with theScore Bet promo code ACTNEWS to unlock up to $1,000 in bonus funds from one of the elite March Madness betting promos. Place your first wager, and if it doesn’t win, you’ll receive bonus funds to continue wagering on March Madness games.
Kalshi Promo Code ACTION Adds a $10 College Basketball Bonus
For a different approach, the Kalshi promo code ACTION provides a $10 bonus after completing a $10 trade. This can be used on various college basketball prediction markets throughout the NCAA Tournament. This is one of the best March Madness betting promos available for First Four games.
Use Underdog Promo Code TOPACTION as Alternative to March Madness Betting Promos Today
If you’re not in a regulated sports betting state, the Underdog promo code TOPACTION is a strong alternative. Place a $5 fantasy entry on First Four picks to unlock $50 in bonus entries.
NCAA Tournament Bracket Predictions
Use the best March Madness betting promos above alongside expert insights from Action Network’s NCAA Tournament Bracket Predictions, or build your own strategy and start betting today.
