Bets placed by professional bettors ('sharps') whose action bookmakers respect and respond to with line movement.
Sharp money refers to bets placed by professional, sophisticated bettors — commonly called "sharps" or "wise guys" — whose judgement bookmakers take seriously. When sharps bet into a market, bookmakers typically respond by moving the line to reduce their exposure, regardless of whether other bettors are also backing the same selection.
The term contrasts with "square money" or "public money" — bets placed by casual recreational bettors whose action does not typically cause line movement. Squares bet on popular teams, big names, and intuitive picks. Sharps bet on data, models, and market inefficiencies.
Reverse line movement is the clearest signal of sharp money: when the line moves in the opposite direction to public betting percentages. If 70% of bets are on Team A but the odds for Team A lengthen (worse odds), sharps are on Team B hard enough to move the market against the majority.
Steam moves are another indicator — rapid, simultaneous line movement across multiple bookmakers, triggered by a large sharp bet hitting a market at one book and cascading to others. Steam moves typically happen within minutes of a bet being placed and can be tracked through odds monitoring services.
Following sharp money is a strategy employed by many recreational bettors who lack the resources to build their own models. By identifying which side has attracted sharp action — using reverse line movement and steam indicators — they aim to bet alongside the more informed side of the market.
The difficulty is timing. Sharp money moves lines quickly, and by the time it is visible the value may already be gone. Betting with sharps works best at books that are slow to react to sharp action elsewhere — getting on before the line fully adjusts. Consistently betting on the sharp side of markets also improves CLV, the best long-term indicator of edge.
Line Movement
The change in odds or point spreads between market opening and kick-off, often driven by sharp money or new information.
CLV (Closing Line Value)
The difference between the odds you backed and the odds at match kick-off — the best long-term predictor of whether your betting strategy has a genuine edge.
Value Betting
Betting at odds that are higher than the true probability of the outcome — finding bets where the bookmaker has underestimated the chances of an event.
Implied Probability
The probability of an outcome embedded in bookmaker odds — calculated by dividing 1 by the decimal odds.
Overround (Vig / Juice)
The bookmaker's built-in profit margin — the amount by which the implied probabilities of all outcomes in a market sum to more than 100%.
For informational and educational purposes only. Disclaimer
