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Player

Heston Kjerstad

BALLFBats LThrows RActive

Season 2025 pitches faced. Sequences are 2-, 3-, and 4-pitch windows. Count filters apply to 2-pitch type rows only. Location sequences use a 4-region plate map. Date windows stay on Arsenal and Hitting.

2-pitch windows

455

Chase%

43.4%

Whiff%

25.9%

xwOBA

0.276

Sequence Entropy

72

Sequence Lift

8.1%

Sequence Effectiveness

-0.015

Location sequence
Type plus a 4-region plate map (up-in, up-away, down-in, down-away). Pairs under 20 sequences are hidden. Count filters do not apply here.
Transition flow
Two-pitch sequences. Link width is how often the next type follows.
Four-seam FastballSliderChangeupSinkerCutterCurveballSweeperSplitterKnuckle CurveSlurveFour-seam FastballChangeupSliderSinkerCutterSweeperSplitterCurveballSlurveKnuckle Curve
Transition lift
P(next | first) minus the unconditional next-pitch mix. Positive means that follow-up is used more than usual after the first type.
Four-seam FastballSliderChangeupSinkerCutterCurveballSweeperSplitterKnuckle CurveSlurveFour-seam FastballChangeupSliderSinkerCutterSweeperSplitterCurveballSlurveKnuckle Curve
Sequence tree from Four-seam Fastball
Branches are 2-pitch, then 3- and 4-pitch n-grams when the sample clears the display floor. Count filters hide 3/4-grams.
Four-seam FastballFour-seam FastballFour-seam FastballFour-seam FastballChangeupChangeupFour-seam FastballSliderFour-seam FastballSliderCutterSplitterKnuckle CurveChangeupFour-seam FastballChangeupSliderFour-seam FastballFour-seam FastballSliderFour-seam FastballCurveballFour-seam FastballCurveballCutterChangeupFour-seam FastballFour-seam FastballSplitterSplitterSweeperFour-seam FastballSweeperSinkerKnuckle Curve
Chase% after Four-seam Fastball
Last-pitch rates on the follow-up. Sample floors hide tiny pairs.
Pooled model after Four-seam Fastball
Observed mix versus a league-pooled next-pitch model given last pitch and count. Smoothing for rare contexts, not a sit or pick.