Player props don't start from a sharp number the way game lines do. Understanding how they're set reveals where the edges are.
The Starting Point
Most sportsbooks derive their player prop opening lines from:
- Statistical projections: Season averages, recent trends, matchup data
- Vegas consensus: Cross-referencing lines from sharp offshore books
- Internal models: Some larger books have proprietary systems
The opening line is often a rough estimate, especially for mid-tier players on smaller markets.
How They're Calibrated
Books watch where the money goes and adjust. For high-volume players (Mahomes passing yards, LeBron points), sharp action comes in quickly and calibrates the line. For a backup tight end's reception prop, the market may never get fully sharp.
Where the Edges Are
Thin markets: A third-string running back's rushing yards prop may open off. Not much sharp action to correct it.
Correlated props: Rushing attempts and rushing yards are correlated. If weather or game script suggests run-heavy, both are likely to beat projections.
Late-breaking news: A late scratch or role change affects props before books can fully adjust.
[Compare prop value against fair lines with Oddible →]
