Archive file · Specimen No. 11

Forkball

Jammed deep between two fingers and snapped out with no spin, so gravity tumbles it down late.

Open this like an archive drawer: grip first, source attached, shape in words, no invented spin or movement numbers. The file exists so the hold can keep moving forward.

Shape read

Holds flat · arm-side run

A heavy, late, almost straight-down tumble — like the floor dropping out at the last instant. With almost no spin there is nothing to hold it up, so it falls off the table, and a modern ghost fork can fade a little arm-side on the way down. The drop is the pitch.

ShapeReputable analysis

The ball is jammed deep between the index and middle fingers — forked wider than a splitter, wedged down toward the knuckles — and released with a downward snap of the wrist. That deep grip and snap deaden the spin so it tumbles down sharply, like a 12-to-6 curve.

OffspeedThe tumbleMagnus, weak: tumble

GripOfficial data

Open the grip file All pitches

01 / At the grip bench

Get to know the hold.

Four ways into the same specimen. Take them in order, or go straight to the detail you came for.

Forkball / Reference model

Reputable analysisMLB.com Statcast Glossary, Forkball (FO)

View

Hand

Keyboard: arrows switch views · F flips the hand · H lifts it

Grip geometry is schematic; the deep, wide fork demands unusual finger reach and flexibility.

01 / Hold

Start with the whole hand.

Official dataMLB.com Statcast Glossary, Forkball (FO)

Paraphrased. MLB.com: the ball is jammed between the index and middle fingers and released with a downward wrist snap, causing extreme downward movement.

Keep a master file beside the hold

The complete grip notes

Split your index and middle fingers wide and wedge the ball deep, toward the base of the fingers.
Keep your thumb underneath to hold it in place.
Throw with fastball arm speed and snap the wrist down as the ball leaves.
Let it squirt out with as little spin as possible — the less it spins, the harder it tumbles.

Bury the ball deep between your fingers, wider than a split. Snap your wrist down as it squirts out and feel the ball leave with little rotation.

Official dataMLB.com Statcast Glossary, Forkball (FO)

Paraphrased. MLB.com: the ball is jammed between the index and middle fingers and released with a downward wrist snap, causing extreme downward movement.

MLB.com sets it apart from its cousin the splitter: the splitter is gripped closer to the fingertips and needs no wrist snap, while the forkball is buried deeper and is snapped — and is far rarer.

Reputable analysisMLB.com Statcast Glossary, Forkball (FO)

Paraphrased from the glossary contrast between the forkball and the splitter.

The deep fork demands unusual finger flexibility — Jose Contreras famously carried a softball to keep his index and middle fingers stretched apart enough to wedge a baseball that far down.

Reputable analysisBaseball Prospectus, Spinning Yarn: The Forkball

Paraphrased. The Contreras softball-stretch detail is from Baseball Prospectus.

What separates a forkball from a splitter today is mostly how wide the fingers fork and how hard it is thrown: Roki Sasaki throws both, a wider, slower fork and a narrower, harder splitter, and Statcast files them separately. It is common in Japan and seldom adopted in the majors.

Reputable analysisForkball — Wikipedia (deep wide grip, wrist snap, tumble, near-extinct, Senga ghost fork, splitter ancestor)

Paraphrased. The wide-fork-vs-narrow-split distinction is from the MLB Sasaki article; the Japan-vs-MLB prevalence is from Wikipedia.

Release Room

Translate the hold into a release

Grip shape only matters if the release makes sense. Read pressure, thumb support, and ball depth before you read the pitch shape.

Hold

No gap — the ball is jammed all the way down between the forked fingers, deeper than a splitter.

Pressure

One side of the deep fork

Leave

Snap the wrist down as the ball squirts out from between the fingers; the deep grip kills the spin.

It is thrown with fastball arm action, but the ball squirts out from between the deep-forked fingers with almost no spin. The downward wrist snap and deep grip separate its release from the shallower splitter.

Reputable analysisMLB.com Statcast Glossary, Forkball (FO)

Paraphrased from the MLB glossary description of the grip depth, wrist snap, and release.

Movement

Almost no spin means almost no lift, so gravity dominates: the ball plots near the spinless ball and falls off the table.

The read is shape, not a gauge. The spin words explain why it moves that way, and every prose claim still carries its source.

Shape

Holds flat · arm-side run

Reputable analysisBaseball Prospectus, Spinning Yarn: The Forkball

Spin words

Very little spin, so no strong axis. What there is leans toward topspin tilted arm-side — consistent with a pitch that tumbles down with a touch of arm-side run.

Reputable analysisFanGraphs, A (Ghost) Fork in the Road: Senga's Premier Pitch

Craft read

A forkball is squeezed so deep between the fingers that it comes out almost without spinning. With no spin there is nothing holding it up, so it tumbles down late and hard, like the floor dropped out. It fools hitters who are geared up for a fastball.

The one teaching sentence

Most pitches fight gravity: backspin makes a Magnus force that holds the ball up. The forkball does the opposite. Jamming the ball deep and snapping it out kills the spin, so there is almost no lift and gravity tumbles the ball down hard and late.

Reputable analysisMLB.com Statcast Glossary, Forkball (FO)

Master Files

The master files

Three forkballs: the modern ghost fork, the deadest-spin version anyone has thrown, and the arm that brought the pitch to the majors. The visual is our own seam schematic. What sets each version apart is in the read, not a gauge.

Kodai Senga

The modern ace forkball — the "ghost fork" — a low-spin tumble with enough arm-side life to be a primary out-pitch.

The "ghost fork" — a dead-spin tumble he gave just enough arm-side fade to use as a primary out-pitch. The reshaping that added that fade may also be making it a touch easier for hitters to pick up: a sharper, straighter drop is harder to read than one that drifts.

Reputable analysisFanGraphs, A (Ghost) Fork in the Road: Senga's Premier Pitch

Roki Sasaki

The deadest-spin non-knuckleball forkball anyone has thrown — so little rotation it behaves almost like a knuckleball off a fastball arm.

So nearly spinless it acts like a knuckleball thrown with fastball intent: nothing holds it up, so it falls off the table about as hard as a non-knuckleball pitch can, with only a small, unpredictable drift to either side. The straightest, heaviest tumble in the wing.

Official dataMLB.com, Roki Sasaki's forkball and splitter explained/ 2026

Hideo Nomo

The "Tornado": the forkball that broke into the majors from Japan in 1995 and led both leagues in strikeouts on opposite sides of the Pacific.

The arm that sold the pitch to the majors — a deep, tumbling fork hidden behind a whirling, back-to-the-plate windup that led a league in strikeouts on each side of the Pacific. His version won on deception as much as drop.

Reputable analysisSociety for American Baseball Research, Hideo Nomo (BioProject)

The colophon

Every claim, sourced

Follow a claim back to the person or record behind it. Confidence labels distinguish firsthand accounts, analysis, and secondhand attribution; the notes preserve what remains uncertain.

Official dataPitcher's own wordsCoach-observedReputable analysisSecondhand, attributed

108 double stitches, 216 individual · seam-informed schematic · as of the dates above

Keep following the pitch

A hold is a beginning.

Set another grip beside it, meet a practitioner, or add what you noticed to the conversation.

Another offspeed in the collection

Set it beside the circle change.

The thumb and index finger form an OK circle against the inner side of the ball while the other three fingers lay across the top. The ball rests deeper in the hand, which deadens the exit, and the off-center grip tilts the axis toward the arm for fade.

Official dataMLB.com Statcast Glossary, Changeup (CH)

Paraphrased from MLB.com Glossary, not quoted.

Compare these two grips

Others in the offspeed

Circle changeup Splitter Knuckleball Eephus

Tier 03 / Field Notes

Field notes from the bullpen.

Every pitcher fiddles. A thumb creeps lower, a seam catches more leather, a cue from a coach suddenly makes the pitch move. Pitch Atlas files those experiments as specimens with context, so the small discoveries stop disappearing into group chats and comment sections.

How notes rank

Evidence and context, never who shouts loudest.

There is no single correct way to throw a pitch, but there are better and worse claims. A funny line should never outrank a tested grip. So notes do not rise on raw votes. They rise on weighted signals - provenance and adoption first.

35%
Provenance
Source tier and evidence. A coach-observed note with a link outranks an unverified hunch with none.
20%
Adoption
How many other pitchers independently tried the same tweak. Real replication, not passive clicks.
20%
Usefulness
Marked useful, measured against views so a small loud crowd cannot stuff the rank.
15%
Context match
How close a note is to your level, slot, and pace context. Computed in your session, never stored.
10%
Community confidence
Considered practice: a real sample size behind the claim, not one good bullpen.

The vocabulary

Field Note: One pitcher's report on a grip variant.
Variant: A specific, named change from the canonical grip.
Tried This: A second contributor replicating the tweak.
Coach Note: A coach reporting on an arm they work with.
Source Challenge: A standing request for the evidence behind a claim.
Provenance: The source tier and evidence that set a note’s rank.
Adoption: How many others independently tried it.
Needs Evidence: A note flagged for missing support, kept visible.

Your bullpen card

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Filing as an unclaimed contributor · anonymous.

Log a field note

Throw the forkball with a wrinkle of your own? Add it. Label where it comes from: your own report, a coach, or a hunch. Keep it to grip and technique only. No medical, injury, workload, or youth-training prescriptions. Every contribution keeps its source context.

Field notes for the forkball

Keeping the bullpen honest

Field Notes are live for grip and technique only. No medical, injury, workload, or youth-training prescriptions. Every note carries a source and confidence label, and contributors can report problems. No abuse, no personal attacks, no off-topic spam, nothing aimed at minors. New field notes stay private until review. See a problem with a public note? Use Report on it; a note flagged by enough people is hidden automatically until it is checked.

Every community variant carries the same source and confidence labels as the records above. Nothing appears here unsourced, and no count is shown until it is real.

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