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March Madness Underdog Betting Trends & Market Insights 2025

By Andrie Thomas
Casino Expert
Mar 18, 2026
10 min read
Quick Answer: Miami (Ohio) is the most-bet team by both tickets and handle on the +7.5 spread at BetMGM for their First Four matchup against SMU, despite carrying +200,000 tournament odds. Sportsbooks expect a chalky 2025 NCAA Tournament, with Duke (+300) leading the national championship board, followed by Michigan (+350) and Arizona (+400).

Miami (Ohio) has become the unlikely darling of early March Madness betting, attracting more tickets and handle than any other team on BetMGM’s First Four spread market at +7.5 against SMU. Despite tournament odds of +200,000, implying a 0.05% chance of winning the national championship, public bettors are loading up on the RedHawks. Meanwhile, sportsbooks are bracing for a chalk-heavy bracket in 2025, with Duke, Michigan, and Arizona controlling the top of the futures board.

Miami (Ohio) Leads BetMGM Liability on the +7.5 First Four Spread

Why the RedHawks Are Drawing the Most Betting Action

According to data tracked by Covers.com, Miami (Ohio) is the single most-bet team by both ticket count and total handle on the BetMGM spread market for their First Four game against SMU [1]. The RedHawks are getting the +7.5 points, meaning bettors believe they can keep the game within a touchdown even if they lose outright. That kind of spread support from the public is rare for a team with tournament odds as long as +200,000.

The +200,000 implied probability translates to just 0.05% chance of winning the national championship, making Miami (Ohio) one of the longest shots in the entire 68-team field [1]. Yet the spread market tells a different story. Public bettors frequently chase points with mid-major underdogs in early-round games, and the RedHawks are the clearest example of that behavior in the 2025 tournament.

BetMGM’s liability on this game is now skewed toward Miami (Ohio) covering, which means the sportsbook needs SMU to win by 8 or more to avoid a payout surge. This dynamic is worth watching as tip-off approaches, because sharp money movement closer to game time could shift the line further in SMU’s favor.

What the Ticket and Handle Split Tells Us

When both ticket count and handle point to the same side, it signals broad public consensus rather than a single large wager distorting the data. Most casual bettors place smaller wagers, so ticket count reflects volume of individual bettors. Handle reflects total dollars. Miami (Ohio) leading both categories means the public is unified in backing the underdog spread, not just one whale placing a big bet.

Sportsbooks generally profit when public consensus loses. In First Four and First Round games, mid-major underdogs covering the spread happens roughly 48-52% of the time historically, making this a genuine coin-flip market rather than a clear edge for either side. The real story is what this betting pattern reveals about public sentiment: March Madness bettors love an underdog story, even when the championship odds are astronomically long.

NIL Is Widening the Gap, and Sportsbooks Are Pricing It In

How Name, Image, and Likeness Has Reshaped Tournament Probability

Sportsbooks entering the 2025 NCAA Tournament are expecting a chalky bracket, similar to the pattern seen in 2024, and the primary structural reason is the Name, Image, and Likeness (NIL) era [1]. Since the NCAA officially permitted NIL compensation in July 2021, elite programs with large donor collectives have been able to retain top players and recruit at levels that smaller schools simply cannot match. The financial gap between a Duke or Michigan and a Miami (Ohio) has never been wider in the modern era.

NIL collectives at programs like Duke reportedly operate with budgets exceeding $10 million annually, according to industry estimates cited by multiple sports business outlets. Mid-major programs like Miami (Ohio) operate with collectives a fraction of that size. This resource disparity is now baked directly into tournament odds, with sportsbooks shortening the prices on blue-blood programs and stretching the lines on mid-majors to reflect the structural talent gap.

The chalky tournament prediction is not just speculation. In 2024, the Final Four included Connecticut, Alabama, Illinois, and NC State, with UConn winning the title as a heavy favorite throughout. Sportsbooks that priced the 2024 tournament correctly profited significantly from public money chasing upsets that never materialized at the rate bettors expected.

Mid-Majors Still Cover Spreads, Even When They Lose

There is an important distinction between winning the tournament and covering a spread. Miami (Ohio) at +200,000 to win the championship is essentially a novelty bet. But Miami (Ohio) at +7.5 in a single game is a legitimate market with real value potential. Mid-major teams that reach the NCAA Tournament are typically well-coached, battle-tested in conference play, and motivated beyond what their seed suggests.

The NIL effect on tournament outcomes does not necessarily translate to First Four or First Round spread results. A 7.5-point spread in a neutral-site game between two teams that both qualified for the tournament is a competitive market. Bettors backing Miami (Ohio) are not betting on a championship run. They are betting on a competitive 40-minute game, which is a far more reasonable proposition [1].

The 2025 Championship Futures Board: Duke, Michigan, and Arizona Lead

Team Championship Odds Implied Probability
Duke +300 25.0%
Michigan +350 22.2%
Arizona +400 20.0%
Miami (Ohio) +200,000 0.05%

Duke enters the 2025 NCAA Tournament as the outright favorite at +300, leading the BetMGM championship futures board [1]. Coach Jon Scheyer’s Blue Devils have been the most consistent program in terms of recruiting class rankings and NIL investment, and the market is reflecting that dominance. At +300, a $100 bet returns $300 profit if Duke wins the title.

Michigan at +350 is the second choice, a notable position given the Wolverines’ program rebuild under their current coaching staff. Arizona at +400 rounds out the top three, consistent with their status as a Pac-12 powerhouse with deep tournament experience. The compression at the top of the board, with just 100 points separating the top three teams, signals genuine uncertainty among oddsmakers about which blue-blood program will emerge.

Historically, the tournament favorite at the start of March Madness wins the championship roughly 20-25% of the time, meaning even Duke at +300 is far from a lock. Since 2010, only Kentucky (2012) and Connecticut (2011, 2014, 2023, 2024) have won back-to-back titles or dominated the futures board the way Duke currently does. The chalk narrative is real, but March Madness has produced at least one major upset in every tournament since the field expanded to 64 teams in 1985 [1].

For bettors looking at futures markets, the key question is whether the implied probabilities at the top of the board accurately reflect the NIL-driven talent concentration, or whether the market is overreacting to the chalk narrative and underpricing mid-tier contenders sitting between +800 and +1500.

What March Madness Betting Trends Mean for Online Casino Players

For players who use fast payout online casinos and also engage with sports betting markets, March Madness represents one of the highest-volume betting periods of the year in North America. The same principles that apply to casino bankroll management apply directly to tournament betting: understanding the difference between a fun, low-stakes wager on an underdog like Miami (Ohio) and a serious futures position on Duke requires the same discipline you bring to any wagering activity.

Fast payout platforms matter during March Madness because the tournament runs across three weeks with games nearly every day from mid-March through early April. If you place a spread bet on a First Four game and it settles within hours, you want your winnings accessible quickly so you can reinvest in the next round’s markets without delays. Choosing a platform with verified fast withdrawal processing is a practical consideration, not just a convenience, during a tournament with this many betting opportunities compressed into a short window.

Key Takeaways

  • Miami (Ohio) is the most-bet team by both tickets and handle on BetMGM’s First Four spread market, receiving more action than any other team on the +7.5 line against SMU [1].
  • The RedHawks carry +200,000 championship odds at BetMGM, implying a 0.05% probability of winning the 2025 NCAA Tournament [1].
  • Duke leads the 2025 national championship futures board at +300, followed by Michigan at +350 and Arizona at +400 [1].
  • Sportsbooks expect a chalky 2025 tournament, citing NIL-driven talent concentration at elite programs as the primary structural factor [1].
  • The NIL era, which began officially in July 2021, has widened the financial gap between blue-blood programs and mid-majors, directly influencing how oddsmakers price tournament futures.
  • Public bettors consistently back mid-major underdogs on the spread in early rounds, creating liability for sportsbooks even when championship odds are extremely long.
  • In 2024, the Final Four included UConn, Alabama, Illinois, and NC State, with UConn winning as a heavy favorite, validating the chalk-tournament thesis sportsbooks are applying again in 2025.

Frequently Asked Questions

Why is Miami Ohio getting so much betting action in March Madness 2025?

Miami (Ohio) is drawing the most tickets and handle on BetMGM’s First Four spread market because public bettors favor mid-major underdogs getting points in early-round games. The RedHawks are +7.5 against SMU, meaning bettors only need them to keep the game within a touchdown to cash. This is a spread bet, not a championship bet, and the public sees value in the points regardless of Miami Ohio’s +200,000 title odds [1].

What are March Madness betting odds for Duke winning the 2025 championship?

Duke is the current favorite on BetMGM’s 2025 NCAA Tournament championship futures board at +300, implying a 25% probability of winning the title [1]. Michigan is second at +350 and Arizona is third at +400. These odds reflect the NIL-driven talent advantage that elite programs hold over the rest of the field entering the 2025 tournament.

How does NIL affect March Madness betting odds?

NIL (Name, Image, and Likeness) compensation, permitted by the NCAA since July 2021, allows elite programs with large donor collectives to retain top players and recruit at levels mid-majors cannot match. Sportsbooks factor this structural talent gap into futures odds, shortening prices on blue-blood programs and lengthening odds on mid-majors. The result is a more compressed top of the futures board and longer prices for potential Cinderella teams [1].

What does BetMGM liability mean in sports betting?

BetMGM liability refers to the total amount the sportsbook would owe bettors if a specific outcome occurs. When one side of a bet attracts significantly more tickets and handle, as Miami (Ohio) has on the +7.5 spread, the sportsbook carries more liability on that outcome. To balance the book, sportsbooks may adjust the line, in this case potentially moving from +7.5 to a higher number, to attract action on the other side [1].

The Bottom Line

The 2025 March Madness betting market is telling two stories simultaneously. On the futures board, sportsbooks and sharp bettors are aligned on a chalk narrative, with Duke, Michigan, and Arizona dominating the championship odds and NIL-fueled talent concentration making genuine Cinderella runs structurally harder than in previous eras. The data from BetMGM supports this: the top three teams on the futures board are all established blue-blood programs with significant NIL infrastructure [1].

On the spread market, the public is doing exactly what it always does in March: falling in love with underdogs. Miami (Ohio) at +7.5 is the clearest example in the 2025 field, drawing more tickets and handle than any other First Four team despite championship odds that imply the RedHawks are essentially a 2,000-to-1 longshot. These two markets, futures and spreads, are measuring different things, and understanding that distinction is the foundation of informed tournament betting.

March Madness remains the most bet sporting event in the United States each year, and the 2025 edition will generate billions in legal wagers across regulated sportsbooks. Whether the chalk holds or a mid-major breaks through, the betting market will react in real time, creating opportunities and risks at every stage of the bracket. The teams and odds will change. The public’s love of the underdog story never does.

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Sources

  1. [1]: Covers.com – Source for Miami Ohio BetMGM ticket and handle data, +200,000 championship odds, Duke/Michigan/Arizona futures board, and sportsbook chalk tournament expectations for March Madness 2025.
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