The one metric sharps actually track
Closing line value (CLV) compares the odds you got when you placed a bet to the final odds right before the event started — the closing line.
If you consistently take prices better than the close, you are, on average, getting positive expected value. The closing line is the market's most efficient estimate of true probability, because it reflects all money and information up to kickoff.
How to calculate CLV
CLV = (odds_at_bet / closing_odds) - 1
- You bet a team at 2.10.
- The line closes at 1.90.
- CLV = 2.10 / 1.90 - 1 = +10.5%.
You beat the close by more than ten percent. Do that repeatedly and profit follows, even across losing runs.
Why CLV beats short-term ROI
ROI over a few hundred bets is dominated by variance. CLV is measurable on every bet — win or lose — so it converges far faster. That is why Overlay ranks tipsters on verified CLV, not just win rate.