MLB Betting Market Size: US Handle, UK Growth and Where the Money Flows
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Numbers tell stories that narrative cannot. When I started betting on MLB, the US sports betting market was a fraction of its current size, most of it flowing through Nevada’s sportsbooks. Today the landscape is unrecognisable. Understanding the scale and direction of the market is not just academic — it directly affects the odds you get, the markets available to you, and the competitive dynamics between bookmakers that create the edges you exploit. Global sports betting revenue is projected at roughly $88 billion for 2026, and knowing where that money sits helps you understand where the opportunities live.
The US Sports Betting Boom: Handle and Revenue Numbers
Americans legally wagered $166.94 billion on sports in 2025, an 11% increase over 2024. Revenue hit a record $16.96 billion. Since the Supreme Court struck down the federal ban on sports betting in 2018, cumulative legal handle has exceeded $600 billion, with 38 states and Washington D.C. now offering legal sports wagering. Those are not abstract numbers — they represent the volume that shapes the lines you bet against.
The hold percentage — the share of money wagered that sportsbooks keep as revenue — has risen steadily, from 8.1% in 2022 to 10.84% by early 2026. That climb reflects several forces: more recreational bettors entering the market (casual money loses at a higher rate than sharp money), increased popularity of high-margin products like same game parlays, and more sophisticated bookmaker pricing models. For bettors, a rising hold means the average bet is less profitable. For skilled bettors, it means the gap between sharp and casual play is widening, which creates opportunity if you are on the right side of that gap.
DraftKings and FanDuel dominate the US market, combining for approximately 72% of market share by handle and revenue. That duopoly affects MLB odds because both operators use similar pricing models, which means their lines converge quickly. Smaller operators occasionally offer slightly off-market prices as they balance their books independently, and those outlier prices are where line-shopping value tends to appear.
UK Gambling Market and the Emerging Appetite for US Sports
The UK gambling market reached a record gross gambling yield of $16.8 billion in the 2024-25 financial year. Sports betting specifically generates $2.48 billion in annual GGY, making it the largest single segment of the UK gambling industry. Andrew Rhodes, chief executive of the UK Gambling Commission, noted at the BGC annual meeting that participation in gambling remains stable at 48% of the adult population, with just under half of British adults engaging in some form of betting or gaming.
What is changing is not the overall participation rate but the mix of sports that UK bettors engage with. Rhodes specifically flagged at an ICE briefing in early 2025 that discussions with operators were showing a widening of the sports offering, with sports beyond football and horse racing growing in popularity — including basketball, NFL, and other US-based sports. That remark is significant because it comes from the regulator, not from a marketing department. The data behind it suggests that UK bookmakers are seeing real demand for American sports markets, including MLB.
The UK sports betting market is projected to reach $21.47 billion by 2030. That growth trajectory, combined with the expanding appetite for US sports, suggests that MLB coverage at UK bookmakers will continue to deepen in the coming years. More markets, more competitive odds, and more promotional activity around baseball — all of which benefit UK bettors who are already building expertise in the sport. Roughly 290 million online bets are placed monthly in the UK on real sporting events, and as MLB’s share of that volume grows, the liquidity and pricing efficiency of MLB markets at UK operators will improve.
MLB’s Slice: Where Baseball Sits Among Sports Betting Categories
MLB revenues reached approximately $11.35 billion in 2024, growth of roughly $1 billion from 2022, which positions baseball as the second-highest-revenue US professional sport behind the NFL. But MLB’s share of sports betting handle does not mirror its revenue ranking. Football — both NFL and college — dominates the US betting handle, followed by basketball. Baseball sits third, which means MLB lines attract less betting volume than NFL or NBA lines for comparable matchups.
Lower volume is a double-edged sword. On one hand, less liquidity means the market is less efficient, which creates more pricing opportunities for sharp bettors. On the other hand, lower-volume markets can have wider margins and faster line moves in response to sharp action, which makes it harder to get down at the best price. In practice, MLB moneylines at major operators are liquid enough to bet at meaningful stakes without moving the line, but prop markets and some alternate lines can be thinner.
The Super Bowl alone generated $1.39 billion in legal wagers in 2025. No single MLB game approaches that volume. Even the World Series, which averaged 15.8 million viewers in 2024, does not generate NFL-level betting handle. But the volume is there across the full 162-game regular season, which offers roughly 2,430 games of daily action from April through September. That daily volume is MLB’s structural advantage for bettors — there are simply more games to analyse, more matchups to evaluate, and more opportunities to find mispriced lines than in any weekly sport.
What Market Growth Means for Odds Quality and Betting Access
Market growth benefits bettors in three concrete ways. First, competition between bookmakers drives better odds. As more operators enter the UK market with MLB coverage, the pressure to offer competitive lines increases. That means tighter vig, more frequent promotional pricing, and more options for line shopping. Five years ago, finding competitive MLB run line odds at a UK bookmaker was difficult. Today, multiple operators price the full range of MLB markets at margins comparable to their football offerings.
Second, growth drives market depth. As more money flows into MLB betting, operators respond by offering more markets per game — player props, alternate run lines, F5 lines, team totals, and same game parlays. That depth gives bettors more ways to express their views and more angles to find value. A game that looks fairly priced on the moneyline might be mispriced on the team total or a specific player prop.
Third, growth drives data availability. The explosion of sports betting has funded an ecosystem of data providers, line tracking tools, and analytical platforms that were not available even five years ago. Public betting percentages, real-time line movement trackers, and pitcher-specific performance databases are now accessible for free or at low cost. That democratisation of data means the information gap between professional and recreational bettors is narrower than ever — which is good news if you are willing to use the tools. UK bettors entering the MLB market today have access to better data, better odds, and better market coverage than at any previous point.
Published by the DiamondEdge team.
