Advanced Pitching Stats for MLB Props - Player Props Education

K% (Strikeout Rate)

K% measures the percentage of batters a pitcher strikes out. This is the most stable and predictive pitching stat because strikeouts are entirely within the pitcher's control.

Prop Application: K% is the foundation of strikeout props. A pitcher with a 28% K rate will consistently produce strikeouts regardless of opponent, making his strikeout prop relatively predictable.

Benchmarks: Below 18% is poor. 22% is average. 26% is above average. 30%+ is elite.

BB% (Walk Rate)

BB% measures the percentage of batters a pitcher walks. High walk rates inflate pitch counts, shorten outings, and put runners on base without contact.

Prop Application: Walk rate directly affects outs recorded props. High walk rate pitchers struggle to go deep into games because their pitch counts balloon early. For outs props, target low BB% pitchers.

Benchmarks: Above 10% is poor. 8% is average. 6% is above average. Below 5% is elite.

Swinging Strike Rate (SwStr%)

Swinging strike rate measures how often batters swing and miss against a pitcher. This is a proxy for pure stuff quality and strikeout ability.

Prop Application: SwStr% is more stable than K% on a game to game basis. A pitcher with elite swinging strike rate (13%+) will produce strikeouts even when facing unfamiliar opponents.

Benchmarks: Below 9% is poor. 10.5% is average. 12% is above average. 14%+ is elite.

xFIP (Expected Fielding Independent Pitching)

xFIP measures what a pitcher's ERA should be based on strikeouts, walks, and a normalized home run rate. It removes luck and defense from the equation.

Prop Application: Compare xFIP to actual ERA. A pitcher with a 3.20 xFIP but 4.50 ERA has been unlucky and may outperform expectations. A 3.20 ERA with 4.00 xFIP is due for regression.

Benchmarks: Above 4.50 is poor. 4.00 is average. 3.50 is above average. Below 3.00 is elite.

BABIP Against

BABIP against measures the batting average on balls in play surrendered by a pitcher. Pitchers have limited control over BABIP, so extreme values typically regress.

Prop Application: A pitcher with a .250 BABIP against has been lucky. His hits allowed will increase as BABIP regresses toward .300. A pitcher with a .340 BABIP has been unlucky and his hits allowed should decrease.

Benchmarks: Below .270 is lucky. .300 is average. Above .330 is unlucky.

Hard Hit Rate Allowed

Hard hit rate allowed measures the percentage of batted balls against a pitcher with exit velocity above 95 mph. Hard contact converts to hits and extra bases at high rates.

Prop Application: Hard hit rate affects hits allowed props. Pitchers who limit hard contact suppress hits even when balls are put in play. High hard hit rate pitchers are vulnerable to hit spikes.

Benchmarks: Above 42% is poor. 38% is average. 34% is above average. Below 30% is elite.

Ground Ball Rate (GB%)

Ground ball rate measures the percentage of batted balls that are ground balls. Ground balls become outs at higher rates than fly balls (excluding home runs).

Prop Application: High ground ball rate suppresses hits allowed and runs allowed. Ground ball pitchers are safer bets for hits allowed unders because ground balls are easier to field than line drives or fly balls.

Benchmarks: Below 40% is fly ball pitcher. 45% is average. 50% is above average. 55%+ is elite ground ball pitcher.

HR/FB (Home Run per Fly Ball Rate)

HR/FB measures what percentage of a pitcher's allowed fly balls leave the yard. League average is around 12%, and pitchers tend to regress toward this number.

Prop Application: A pitcher with a 6% HR/FB has been lucky. His home runs allowed will increase. A pitcher with an 18% HR/FB may see improvement as fly balls stop leaving the yard at unsustainable rates.

Benchmarks: Below 9% is lucky. 11 to 13% is average. Above 15% is unlucky or has homer prone tendencies.

Pitches Per Inning

Pitches per inning measures efficiency. Pitchers who work quickly and get quick outs can go deeper into games without exhausting their arm.

Prop Application: This is critical for outs recorded props. A pitcher averaging 14 pitches per inning can reach 7 innings on 98 pitches. One averaging 18 pitches per inning hits 100 pitches before completing 6 innings.

Benchmarks: Above 17 is inefficient. 16 is average. 15 is above average. Below 14 is elite efficiency.