MLB strikeout props today
A pitcher's strikeout total tonight is mostly a function of K/9 weighted by recent form, opposing lineup K% (the right batters whiff at the right rates), and how many innings they're likely to go. We project all five — K, ER, hits, walks, outs — for every probable starter, with a TTO penalty for the third time through the lineup.
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How we project pitcher strikeouts
Base formula: projected K = (K/9 × IP/9) × (lineup avg K% ÷ league 22.2%). Then we adjust for recent form (weighted last-3 starts), velo trend (a 1.5+ mph fastball drop in the last 21 days is a red flag), and TTO penalty (3rd-time-through K rate drops by ~15%).
The lineup K% piece is the most overlooked. A pitcher with a 9.0 K/9 facing a lineup of high-K hitters (28% combined K rate) projects for way more strikeouts than the same pitcher facing the contact-first Astros (19% K rate).
When to fade a high-K pitcher
- Short rest: Returning on 3 days = K/9 drops ~0.8.
- Recent velo dip: If fastball is down 1.5+ mph in the last 21 days, the swing-and-miss disappears first.
- Coors / hitter-park K depression: Pitchers strikeout ~10% fewer at Coors vs neutral parks.
- Cold weather pitching to a hot bat: Edge cases but worth eyeballing.
Frequently asked
What is TTO penalty?
TTO = Times Through the Order. Pitchers see a meaningful drop in effectiveness when they face a hitter for the 3rd time in a game. Our model applies a roughly 15% penalty to K projections for the 3rd time through, which is empirically what the data shows league-wide.
How do you handle pitcher velo trends?
We pull pitch-by-pitch fastball velo from Baseball Savant for the last 21 days and compare to season average. A 1.5+ mph drop triggers a velo-trend warning badge on the pitcher dashboard and lowers the K projection by ~5%.
Why does lineup K% matter so much?
Strikeouts are bilateral — you need both a pitcher willing to throw a swing-and-miss pitch AND a hitter willing to swing through it. A 30% K hitter is 50% more likely to whiff than a 20% K hitter in the same matchup. Lineup K% is the single biggest variance driver in K props.
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