Guide
Hits, Total Bases, Strikeouts: Understanding MLB Prop Types
Every MLB prop market has its own personality: some are stable and research-friendly, some are lottery tickets, and some quietly punish people who don't know the scoring rules. Before evaluating any line, it's worth knowing what each stat actually counts and how its outcomes distribute. Here's a plain-English tour of the markets you'll see on every board.
Hits: the simplest market
A hit is a single, double, triple, or home run — walks, hit-by-pitches, errors, and fielder's choices don't count. The standard line is 0.5 (will he get a hit?) with 1.5 (a multi-hit game) for elite bats. Even good hitters go hitless roughly 30–35% of nights, because four plate appearances is a tiny sample of a .300 skill. Hits props are easy to understand and brutally exposed to single-game variance; plate-appearance volume — where the player bats in the order — matters as much as talent.
Total bases: hits, weighted
Total bases weights each hit by its value: a single is 1, a double 2, a triple 3, a home run 4. Nothing else counts — a walk is 0 total bases, and so is a stolen base. That weighting changes the market's character completely. Over 1.5 TB can be cleared by two singles or one double, so contact hitters and power hitters reach it by different roads. Higher lines (2.5+) lean heavily on extra-base power, which makes ballpark and pitcher fly-ball tendencies far more important than they are for a hits prop.
Home runs, RBIs, and runs: the volatile tier
These are the boom-or-bust markets. Even a 40-homer season is a homer roughly every four games, so 'over 0.5 HR' loses most nights for everyone — its appeal is payout, not probability. RBIs and runs add a further wrinkle: they depend on teammates. An RBI needs runners on base ahead of you; a run needs someone behind you to drive you in. Lineup context — who bats around the player, how good the offense is overall — often matters more than the player's own form.
Pitcher strikeouts: the researcher's market
Strikeout props are widely considered the most model-friendly market in baseball, because both inputs are stable and public: the pitcher's strikeout rate and the opposing lineup's strikeout tendency. A high-K pitcher facing a free-swinging team is a fundamentally different proposition than the same pitcher against a contact-first lineup. The hidden variable is pitch count and workload — a starter on a limit can dominate and still fall short of 6.5 Ks by being pulled in the fifth. Check recent innings-per-start, not just the K rate.
Outs recorded, earned runs, and walks
Outs recorded (innings pitched × 3) is a market on how deep the starter goes — driven by efficiency, the team's bullpen situation, and how quick the manager's hook is, as much as by talent. Earned runs allowed and walks allowed are unders-shaped markets where blowup innings dominate: a pitcher can be excellent for five innings and destroy the under in the sixth. These markets reward knowing the manager's patterns and the pitcher's leash, which casual research usually skips.
Combo props and where to start
Combined markets like hits + runs + RBIs sum several stats into one number, which smooths variance — a quiet 1-for-4 with a run scored still pays 2 toward an H+R+RBI line. The tradeoff is that they're harder to reason about, since three separate distributions are stacked. For beginners, the common advice is to start where the research is cleanest: strikeout props and low hits/total-bases lines, where a player's game log against the exact number tells you most of the story. That log-versus-line grading is precisely what SlateIQ automates across every prop type on the nightly MLB board.
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SlateIQ grades every prop on the MLB pick’em board against the last 10 game logs and the sportsbook line, sorts it into Chalk, Boom-or-Bust, and Fade — and grades its own calls in public the next morning. Research tool, not betting advice.
Start the free 7-day trial →Frequently asked
What counts as a total base in MLB props?
Only bases earned by hits: 1 for a single, 2 for a double, 3 for a triple, 4 for a home run. Walks, hit-by-pitches, steals, and advancing on errors or outs all count for zero.
Do walks count toward a hits prop?
No. A walk is not a hit, so a 3-walk night is 0-for the hits line. This cuts both ways: patient hitters can have productive games that miss hits props entirely, which is worth checking in the game log before taking an over.
Which MLB prop type is easiest to research?
Pitcher strikeouts, by consensus — the pitcher's K rate and the opposing lineup's strikeout tendency are stable, public, and directly predictive. Hits and low total-bases lines are next. Home run, RBI, and run props carry the most single-game randomness.