The Closing Line & Why It Matters

## The Closing Line as the Best Estimate The closing line — the last price available before an event starts — is widely considered the most accurate estimate of true probability in a liquid market. By the time a market closes, it has absorbed the most information: team news, sharp money, public money, and model estimates from hundreds of sources. Studies across multiple sports consistently find that the closing line outperforms most individual prediction models in accuracy. The market, in aggregate, is a very good forecaster. ## Closing Line Value (CLV) Closing Line Value is the measure of whether you consistently beat the closing line. If you bet a team at 2.20 and it closes at 1.90, you have positive CLV — you got a better price than the final market consensus. If you bet at 2.20 and it closes at 2.40, you have negative CLV. CLV is important because: - It measures edge independently of short-term results - It is harder to fake than profit (profit can be a lucky run; consistently beating the close cannot) - Professional bettors track CLV as their primary performance metric ## The Practical Implication Bettors who consistently achieve positive CLV have a demonstrable edge. Over a large enough sample, this edge translates to profit. The goal is not just to find winners — it is to find bets where your price is better than where the market settles.