Keep the ball out in the fingers.
The ball sits up between the split fingers, farther forward than a forkball.
A fastball look, a trap-door drop.
Splitter
Wedge the fingers wide, throw it like the fastball, and let the lost backspin drop it off the table at the plate. The same arm, the same path, then the floor falls out.
Specimen 05
seam-informed schematic
Sourced, not corrected
01Grip Lab
View
Hand
Drag to inspect, or use the View buttons
The trap door / 05
Splitter
It looks like the fastball the whole way, then the floor drops out at the plate.
Ball depth
Neutral depth
Spacing
Wide spacing
Thumb
Thumb supports underneath, centered between the two split fingers.
Release feel
Throw it like the fastball and let the wide split take the spin off.
The ball sits up between the split fingers, farther forward than a forkball.
Palm gap cue
- Index pad / Half of the wide splitWedged to the outside of the ball. Split wide, fingers off the seams.
- Middle pad / The other half of the split that kills the backspinWedged to the opposite side. As wide as the hand allows, stiff wrist.
- Thumb / Balances the ball between the split fingersUnder smooth leather, centered. Centered underneath.
See it live / via @PitchingNinja
The grip is the cause. This is the effect, the same pitch shot in a real bullpen. Sourced, not corrected.
- 1Wedge your index and middle fingers wide, to opposite sides of the ball, off the seams.
- 2Let the ball sit up between them, farther forward than a deep forkball.
- 3Rest your thumb underneath, centered between the split fingers.
- 4Throw it with fastball arm speed and a firm wrist; the split kills the spin for you.
Throw it as hard as the fastball. The wide split does the work, not a softer arm.
The sourced grip, in full
The index and middle fingers are wedged to opposite sides of the ball, spread wide on the outside of the leather, wider and farther back than a forkball, with the ball coming off the inside of the fingers rather than the fingertips. Thrown with the arm action of a fastball.
Reputable analysisWikipedia, Split-finger fastball
Paraphrased from Wikipedia (Split-finger fastball) and corroborated by Driveline; not quoted.
A descendant of the forkball, the splitter is held farther forward in the hand with a wider split between the fingers, which is why it can be thrown harder than the deep-jammed forkball.
Reputable analysisWikipedia, Split-finger fastball
Wikipedia describes the splitter as a faster, shallower cousin of the forkball.
Driveline files the splitter under the same family and notes its defining trait: it spins significantly less than a fastball. The reduced backspin, not any added force, is what makes it drop.
Reputable analysisDriveline Baseball Help, Pitch Grips: Splitters
Paraphrased from Driveline. Specific RPM figures vary and are not asserted here.
Bruce Sutter's unusually large hands let him spread the split far enough to execute it; he learned it from instructor Fred Martin after his fastball faded post-surgery and never changed the grip after the first day.
From the Hall of Fame tribute to Sutter; the hand-size detail is corroborated on his Wikipedia page.
Grip geometry is schematic and shows the wide split-finger family; the depth and spread vary with hand size, and large hands make it easier.
02Release Room
Translate the hold into a release.
Grip shape only matters if the release makes sense. This room keeps the player reading pressure, thumb support, and ball depth before movement numbers show up.
Throw it as hard as the fastball. The wide split does the work, not a softer arm.
index finger owns the shape.
Half of the wide split
Release is a feel, not a formula.
Throw it like the fastball and let the wide split take the spin off.
Film Room / watch a master
The schematic shows the release path. This is the release: Gibson walking through the delivery himself. Real hand, real ball, real finish, no model can fake it.
It is thrown with the arm speed and release of a fastball. The wide split and a stiffer wrist dramatically reduce the backspin, weakening the Magnus lift that keeps a four-seamer riding, so gravity wins late and the ball drops sharply, the classic trap-door look.
Reputable analysisThe Conversation, the physics of Kevin Gausman's splitter
Paraphrased from The Conversation's physics breakdown of Gausman's splitter.
03Movement translation
A fastball that quits on the hitter.
The wide grip strips the backspin a fastball lives on, so the ball stops riding and gravity takes it down late. The hitter has already swung where the fastball should be, and the pitch falls under the barrel.
The measured movement, if you want it
Because it leaves the hand looking like the fastball, the hitter starts a fastball swing; then the low backspin lets gravity pull it under the barrel at the last instant. Take the split away or add backspin and it just becomes a slow fastball.
Reputable analysisThe Conversation, the physics of Kevin Gausman's splitter
Synthesized from The Conversation and Wikipedia: the reduced-Magnus drop off a fastball look is the whole pitch.
Spin axis and force direction, drawn in render space
Spin rate
Much lower than the four-seam. The pitch spins significantly less than a fastball, which is the entire point: less backspin, less lift, more drop.
Reputable analysisDriveline Baseball Help, Pitch Grips: Splitters
Driveline states the splitter spins significantly less than fastballs; specific RPM figures are not asserted.
Late tumbling drop
≈ Gausman's splitter drops roughly 50 to 75 cm before the plate, against about 25 to 30 cm for his fastball, the extra fall arriving late.approx
Reputable analysisThe Conversation, the physics of Kevin Gausman's splitter
Illustrative figures from The Conversation's physics analysis of Gausman's splitter.
Velocity off the fastball
≈ A few mph below the fastball it imitates: league-average splitters sat near 85 mph against about 92 mph four-seamers in 2010.approx
Reputable analysisWikipedia, Split-finger fastball
2010 PITCHf/x league averages for right-handers, per Wikipedia; a roughly 7 mph gap.
Spin axis
A fastball-like backspin axis out of the hand, so the two look identical at release; the deception lives in matching the fastball's spin axis until the pitch separates in flight.
Reputable analysisWikipedia, Split-finger fastball
It barely rides, so it falls almost like a spinless ball, late and under the barrel.
“I’d like to tell you I worked and worked at it but I’d be lying to you because it did come to me right away. The first day I threw it I’d get it to break ... I never adjusted my grip after the first day.”
Bruce Sutter, recalling learning the split-finger from Fred Martin, in the Hall of Fame tribute.
02Master files
The verified baseline.
From the pitch's pioneer to its modern swing-and-miss kings. The visual is our own seam schematic. Every figure is season-stamped and links to its source.
Master file · 01Verified · Attributed
Bruce Sutter
The pioneer. Taught the split-finger by instructor Fred Martin after arm surgery, he rode it to the Hall of Fame as one of the first dominant closers.
Career saves
300
Reputable analysisWikipedia, Bruce Sutter
Cy Young
1979 NL
Reputable analysisWikipedia, Bruce Sutter
Career ERA
Master file · 02Verified · Attributed
Roger Clemens
Added the splitter in the 1990s, nicknamed it "Mr. Splitty," and made it his out pitch, one of the most devastating in the pitch's history. He has his own chapter in the Craftsmen.
Career strikeouts
Nickname
Mr. Splitty
Reputable analysisWikipedia, Roger Clemens
Master file · 03Verified · Attributed
Kevin Gausman
The modern volume king. His splitter has produced more swinging strikes than any other pitcher's since the Statcast era began, by a wide margin.
Swinging strikes since 2015
1,712 (most in MLB)
Reputable analysisJays Journal, Gausman's splitter is one of the best pitches in baseball
Far ahead of the next-most (Hector Neris, 1,013).
Velocity
83.6 mph
Reputable analysisRockland Peak Performance, what makes Gausman's splitter effective/ 2021
2021.
Drop vs. fastball
≈ ~50-75 cm vs ~25-30 cmapprox
Reputable analysisThe Conversation, the physics of Kevin Gausman's splitter
Master file · 04Verified · Attributed
Shohei Ohtani
The unhittable one. In 2021 his trap-door splitter posted the highest swing-and-miss rate of any pitch in MLB.
Velocity
89.9 mph
Reputable analysisMLB.com, Ohtani's splitter still the most unhittable pitch/ 2021
2021, up from 87.3 mph as a 2018 rookie.
PA ending on the splitter
0-for-19, 18 K
Reputable analysisMLB.com, Ohtani's splitter still the most unhittable pitch/ 2021
2021; the highest swing-and-miss rate of any MLB pitch that year.
Filed only when the bar is met. A real figure from the wrong tracking system, or a great arm whose signature pitch sits in a different category, gets left off rather than dressed up. The gap is the honesty.
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 keeps those experiments visible, labeled, and debated, 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 velocity. 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.
The living layer
Field notes open soon.
Soon you will log your own grip tweak, mark the ones you have tried, and flag anything off, anonymously or under a handle you keep. When the community layer opens, every note will carry a source and confidence label, a content filter will block abusive language, and any note can be flagged. A note hides automatically once enough people report it.
When they open, every community variant will carry the same source and confidence labels as the records above. Nothing appears here unsourced, and no count is shown until it is real.