Prop Hit Rates Explained (L5, L10, L20)
A prop hit rate is the percentage of recent games in which a player's stat would have cleared a given line. L5, L10, and L20 refer to the last 5, 10, and 20 games. Shorter windows capture recent form but are noisy; longer windows are more stable but slower to reflect real change.
What a hit rate is
A hit rate is the percentage of a player's recent games in which a stat would have cleared a given line. If a player has gone over 1.5 total bases in 7 of his last 10 games, his L10 hit rate on that line is 70 percent.
The label names the window: L5 is the last 5 games, L10 the last 10, L20 the last 20. Research tools typically show all three side by side because they often disagree, and the disagreement itself is informative.
Why window size matters
Short windows track form but are noisy. In an L5 window every game is worth 20 percentage points, so a single fluky performance swings the number dramatically.
Long windows are stable but slow. An L20 window smooths out flukes, but it can include games from before a role change, a lineup shift, or an injury return, quietly describing a player who no longer exists.
When L5 and L20 disagree, treat it as a question rather than an answer. Check whether something real changed, like a new role or a returning teammate, or whether the short window is just noise.
Streaks vs hit rates
A hit rate ignores order; a streak is all about order. A 7-of-10 player who hit his last five in a row looks very different from a 7-of-10 player who missed his last three, even though both show a 70 percent L10.
Streak detection surfaces this by flagging when the recent sequence is unusually hot or cold relative to the base rate. Use a streak as a prompt to ask why, not as proof that a pattern must continue.
Context that breaks hit rates
Role changes: a batter moving up the order or a player entering the starting lineup changes opportunity, and past games stop reflecting it.
Injuries and rest: a hit rate built on healthy games says little about a player managing an injury, playing on short rest, or likely to sit late in a lopsided game.
Matchups: opponents are not interchangeable. A 70 percent hit rate compiled against weak opposition means less tonight against a defense that ranks near the top against that exact stat, which is why research tools pair hit rates with opposition rankings.
Combining hit rates with line value
A hit rate is only meaningful relative to a specific line. A player whose L10 shows 70 percent over 24.5 points may show 40 percent over tonight's 27.5, so always check which line the rate was measured against.
A high hit rate is usually already in the price. If a player has cleared a line in 9 of 10 games, the odds will typically be expensive; the interesting cases are where the hit rate and the price disagree, and that gap is exactly what expected value measures.
Frequently asked questions
Which hit-rate window should I trust: L5, L10, or L20?
Use them together rather than picking one. L20 gives the most stable baseline, L5 shows current form, and L10 is the common middle ground. Agreement across all three is the strongest signal; disagreement is a prompt to look for a role change, an injury, or plain noise.
Is a high hit rate enough reason to bet a prop?
No. The price matters as much as the rate: a 70 percent hit rate at odds implying 75 percent is a losing bet on those numbers. Verify the line the rate was measured against, check for context changes, then compare the rate against the implied probability of the current price.
Do hit rates account for the line moving?
Only if the tool recomputes them against the current line. A rate computed against an older or season-average line can mislead when tonight's number is different, so always check which line the displayed rate refers to.