Archive file · Specimen No. 10

Cutter

A fastball thrown off-center, so it rides like a heater and then bites to the glove side at the end.

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

Rides · glove-side sweep

Rides almost like a four-seam, then bites short and late to the glove side at the very end — a small, sudden cut, far shorter than a slider's sweep. The harder a pitcher leans on it, the more ride he trades for that bite.

ShapeOfficial data

A four-seam grip with both fingers shifted slightly toward one side of the ball — the glove side for the handedness — and thrown like a fastball. That off-center placement produces a short cutting movement at the plate without a slider's pronounced finger pull.

FastballThe late cutMagnus, cut

GripOfficial data

Open the grip file All pitches

Archive Drawer / Grip Lab

The artifact in the hand

Lead with the hand. The fingers on the ball below are the sourced contacts, solved onto the seam. Drag the ball, or use the view buttons.

Reputable analysisMLB.com Glossary — Cutter (FC)

View

Hand

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

01Start from your four-seam grip and shift both fingers slightly toward the glove side of the ball.
02Let the middle finger carry a touch more pressure.
03Throw it with full fastball arm speed and just a hair of supination.
04Let the ball cut off the fingers; the bite is small and late, and that is the point.

What it should feel like

Throw it like your fastball. Shift the grip slightly off-center and let the ball cut off your fingers — do not pull down the side like a slider.

Grip geometry is schematic; the more a pitcher supinates and shifts off-center, the closer it drifts to a hard slider.

Ball depth

Neutral depth

Spacing

Fingers close

The sourced grip, in full

Official dataMLB.com Glossary — Cutter (FC)

Paraphrased. MLB.com: both fingers placed toward one side (the right of the ball for a righty, the left for a lefty) to produce the cutting movement.

A common build is a four-seam fastball grip with the ball set slightly off center in the hand — the same fastball, just nudged off the middle.

Reputable analysisWikipedia, Cut fastball

Paraphrased from Wikipedia's grip description.

The cut comes from that finger placement and a touch of supination at release, not from a big wrist action — it is a fastball that bites. Lean harder into the supination and the off-center grip and it drifts toward hard-slider territory.

Reputable analysisMLB.com Glossary — Cutter (FC)

Paraphrased. MLB confirms the grip-driven cut and fastball delivery; the supination/slider-drift framing is coaching-standard.

It is the most ride-or-die-able single pitch in the game: Mariano Rivera threw almost nothing but his cutter across his whole career, and Kenley Jansen leans on his nearly as hard — proof that one great cutter can be a whole career.

Reputable analysisWikipedia, Cut fastball

Paraphrased. Rivera and Jansen are among the most cutter-reliant arms ever tracked.

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

Held like a fastball, not buried — the cut is from the grip, not from squeezing.

Pressure

Drives the late cut

Leave

Throw it like a four-seam with a hair of supination — let the ball cut off the fingers rather than pulling down the side like a slider.

It is thrown a hair softer than the four-seam, with the same arm action, so it tunnels off the fastball. The late glove-side cut comes from the off-center grip and a slightly supinated release rather than from a slider's downward finger pull.

Reputable analysisMLB.com Glossary — Cutter (FC)

Paraphrased. The fastball-minus feel and same-arm-action tunneling are coaching-standard, anchored to the MLB glossary's fastball-with-a-cut framing.

Movement

It rides like a fastball but its axis is tilted glove-side, so a little of the lift becomes a short, late cut.

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

Rides · glove-side sweep

Official dataBaseball Savant (Statcast), Emmanuel Clase/ 2025

Spin words

A fastball axis tilted toward the glove side, just shy of upright for a right-hander, with a little of the spin turned gyro. That mix is why it rides like a fastball but cuts instead of running true.

Reputable analysisMLB.com Glossary — Cutter (FC)

Craft read

A cutter looks like a fastball almost the whole way, then darts to the glove side right before it gets to the plate. That tiny, late move is enough to catch the thin part of the bat instead of the barrel — which is why a great one breaks so many bats.

The one teaching sentence

A four-seam rides on pure backspin: the axis is sideways to flight, so the Magnus force points straight up and the ball carries. Tilt that axis toward the glove side and let a little of the spin go gyro, and the ball trades some of its ride for a short, late cut to the glove side — a fastball that bites just enough to miss the barrel.

Reputable analysisMLB.com Glossary — Cutter (FC)

Master Files

Three ways the same pitch wins

Three cutters across eras: the archetype, the modern extreme, and the cutter as a primary fastball. The visual is our own seam schematic. What sets each version apart is in the read, not a gauge.

Mariano Rivera

The archetype: one cutter, thrown almost every pitch, all the way to the Hall of Fame. The proof that a single great pitch can be a whole career.

A modest, almost gentle cut — but so late and so repeatable that hitters who knew it was coming still could not square it. The whole career rode on one pitch that bit just enough, every single time.

Reputable analysisBleacher Report, Visual Breakdown of the Rise & Dominance of Mariano Rivera's Cutter/ 2007-2008

Emmanuel Clase

The modern extreme: a cutter thrown two of every three pitches, with a high-ride shape that behaves more like a fastball than a breaking ball.

The cutter pushed to fastball intent, riding high and biting hard at once — so heavy and so firm that it plays like a heater that happens to cut, and hitters have to honor it like a true breaking ball.

Official dataBaseball Savant (Statcast), Emmanuel Clase/ 2025

Corbin Burnes

The cutter as a primary fastball, leaned on hard enough to anchor a Cy Young arsenal — a shorter, harder-to-square shape than Clase's.

A shorter, tighter cut than Clase's, leaned on as the everyday fastball — the bite is small and the ride is honest, which is exactly what makes it so hard to barrel across a whole start.

Official dataBaseball Savant (Statcast), Corbin Burnes/ 2025

The colophon

Every claim, sourced

Nothing here is marked right or wrong. It is marked by where it came from and how confident the source is. A broken citation throws at build, so a dead source never reaches you.

Official dataPitcher's own wordsCoach-observedReputable analysisSecondhand, attributed

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

The arm who owned it

C-10 · 1995-2013

Mariano Rivera

CutterOpen the file →

Others in the fastball

Four-seam fastball Two-seam fastball Splinker

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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Log a field note

Throw the cutter 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. Sourced, not corrected.

Field notes for the cutter

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.