What does closing line value tell me?
Short answer: Closing line value tells you whether you bet at a better price than the market's last price before the game. Beating the close over many bets is the best available sign your prices are good, because the closing line folds in all the information the market had. One bet's CLV says almost nothing, and positive CLV is not a guarantee of profit.
What it measures
Closing line value (CLV) compares the price you bet with the market's last price before the game starts. If you took an under at -110 and it closed at -130, you beat the close: the market moved toward your side after you bet.
Why it matters
The closing line is the most informed price there is: it folds in every injury report, lineup and sharp bet up to tip-off. Wins and losses on props are noisy; it takes hundreds of bets to tell skill from luck. Beating the close is a signal you can read much sooner, which is why professional bettors track it.
What it does not tell you
- Not a guarantee. Positive CLV is evidence, not profit; a closing line can still be wrong.
- Not one bet. A single bet's CLV is almost meaningless; the average over many bets is what counts.
- Which close? Measure against a sharp book's closing price where you can; a retail book's close can lag.
The longer guide is Closing line value, explained. OpenSlate's Pro journal records the closing price for each bet you log.
A worked example
You bet an under at -110 (52.4% implied). By tip-off the price is -130 (56.5% implied). Measured on no-vig probabilities, the market moved about four points toward your side after you bet, so you beat the close. If the under then loses, the bet was still taken at a good price; if it wins at a price that closed worse than yours, you were lucky rather than right.
How many bets before it means something?
CLV settles faster than profit, but it still needs volume. A few dozen bets can show a direction; a few hundred make it convincing. Track it the same way every time: same reference book, same definition of closing, and note when a line was pulled or moved off the number you bet.
CLV on player props specifically
Player props close with less betting behind them than main markets, so their closing prices are less informed and noisier. CLV still works as a check, but it needs more bets to mean the same thing, and it is worth measuring against a market-maker book's close rather than a retail book's.
Related questions
- How often do prop lines move?: today's measured share of lines whose price changed at each book.
- What is the vig on DraftKings props?: how to measure the margin, with today's medians at both books.
- How do injury reports move prop lines?: what books do when a player is ruled out, and why teammates move.
- Is DraftKings or Pinnacle sharper?: why one book's prices are treated as the market's reference, and where that stops being true.
Every answer on these pages is market data and education. OpenSlate does not publish free picks and does not tell you what to bet; it shows prices and measurements.
More: Removing the vig: how to turn two prices into a fair probability · Why Pinnacle is the reference price · Closing line value, explained · Why parlays cost more than the same bets straight · Why player prop lines move · Is DraftKings or Pinnacle sharper on NBA player props? · How do I calculate a no-vig price? · What is a +EV player prop? · Why do DraftKings and Pinnacle prop lines differ? · What is a Trap Over? · Are NBA rebound unders profitable? · How do I compare sportsbook prop odds for free? · How often do prop lines move before tip-off? · What is the vig on DraftKings player props? · How do injury reports move NBA prop lines? · What is a market-maker sportsbook? · Is it better to bet the over or the under on player props? · Can you make money betting player props? · Can you bet at Pinnacle from the US? · What free tools help with player prop betting? · Does betting DraftKings when it disagrees with Pinnacle work? · What does over/under mean on a player prop? · How do sportsbooks set player prop lines? · What is a sharp bettor? · How do I convert American odds to implied probability? · What is a steam move in sports betting? · What are alternate lines on player props?
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