01The Specimen

The pitch,
in your hand.

A grip to inspect. A seam to follow. A story that brings you back to the ball.

Open the Pitch Index Study this grip

Filed specimenFour-seamFile00

Austin holding a baseball with index and middle fingertips crossing the wide horseshoe seam.

Austin video

Fingertips cross the seam path

Source: Pitcher's own words

Open specimen

Follow the craft

Every grip
opens a story.

Start with the hand. Follow the pitch into the life behind it, then bring what you notice back to the ball.

The grip · 03

Filed specimen12-6 curveFile03

A looping close-up of Austin's 12-6 curveball grip: two fingers tucked together and cornered against one seam.

Austin video

Two fingers set against the seam

Source: Pitcher's own words

Open specimen

Grip demonstration by Austin H.

Inspect the 12-6 curve grip

The person · 2005-2023

Adam Wainwright

“If I didn’t have my curveball, I don’t get out of A-ball.”

Pitcher's own wordsESPN, The secret to Adam Wainwright's success: a curveball like none other (Buster Olney)

To ESPN, on how completely his career rested on the one pitch.

Look at the hold. Read his account. Return to the grip with a different question.

Read the craftsman’s file

Further back in the archive

Rube Foster's Fadeaway

The screwball of the man who built the leagues. Follow the surviving account into the screwball’s file.

02Inside the cover

Follow
the seam.

One seam, two ways to look. Inspect the leather and stitching, then bring the same seam into a clear drawing.

Seam-informed schematic. Use the drawing to orient yourself; open the grip to see where the fingers rest.

Find the fingers on the four-seam

01 / The cover02 / The seam

Seam-informed schematic · Original geometry

03The Filed Set

The filed set.

3 shown · 12 filed. Flip a card for its sources.

One specimen per family: grip first, source attached. The rest of the set lives in the Pitch Index.

Filed specimenFour-seamFile00

A looping close-up of Austin's four-seam grip: two fingertips laid across the seam, the ball held out toward the camera.

Austin video

Fingertips cross the seam path

Source: Pitcher's own words

Open specimen

Four-seamNo. 00 · Fastball

RidesMagnus · direction only

Grip cueFingers cross the outward-facing horseshoe seam, pads resting where the two seams run closest together.Reputable analysis

ShapeRides through the top of the zone. Backspin fights the fall the whole way, so it drops less than a spinless ball and looks like it holds its line. It carries; it never literally rises.Reputable analysis

Grip: Wikipedia, Four-seam fastball Shape: MLB.com Statcast Glossary, vertical movement context

Open the full file

Filed specimen12-6 curveFile03

Austin video

Two fingers set against the seam

Source: Pitcher's own words

Open specimen

12-6 curveNo. 03 · Breaking

Drops · glove-sideMagnus, down · direction only

Grip cueDriveline's standard curve grip leverages the middle finger on the seam with the index on the leather and the thumb on a seam underneath. Topspin comes from getting the fingers in front of the ball and pulling down, the cue being to yank it down with the middle finger.Reputable analysis

ShapeA heavy, late, straight-down drop. Topspin and gravity pull the same way, so the floor falls out far harder than a spinless ball would, with little sideways run. The cleanest ones drop almost straight; tilt the axis glove-side and it sweeps into a diagonal power curve.Official data

Grip: Driveline Baseball, How to Throw a Curveball Shape: MLB.com Statcast Glossary, vertical movement context

Open the full file

Filed specimenCircle changeFile02

Reference grip model

MLB.com calls the circle change the most common changeup grip: thumb and index in a circle on the inner side, the other three fingers over the rest of the ball. Held farther back in the hand, sometimes toward the palm, which is what takes the speed off.

Source: Official data

Open specimen

Circle changeNo. 02 · Offspeed

Holds plane · arm-side runMagnus, arm-side · direction only

Grip cueMLB.com calls the circle change the most common changeup grip: thumb and index in a circle on the inner side, the other three fingers over the rest of the ball. Held farther back in the hand, sometimes toward the palm, which is what takes the speed off.Official data

ShapeIt runs toward the throwing hand and tumbles under the barrel, late and on the arm-side. The fade is real and the drop is real; how wide it runs depends on how hard the arm turns the axis over.Official data

Grip: MLB.com Statcast Glossary, Changeup (CH) Shape: Baseball Savant (Statcast), Logan Webb

Open the full file

Open the full Pitch Index

Fresh from the game

From one hand to another.

Listen to a pitcher explain it. Watch a grip turn. These lessons and recovered conversations keep the people beside the pitch. Choose a player when you are ready to watch.

Heritage file · TikTokJun 2026

Nolan Ryan on his four-seam and two-seam

Ryan in his own words on the two fastballs. The four-seam stays true and rides up on the hitter; the two-seam runs in on a righty and away from a lefty. It's the exact four/two split these specimen pages are built on, taught by the man who threw it.

“Nolan Ryan didn't just throw gas — he understood movement. His breakdown of why the 4-seam plays up, and why the 2-seam is deadly running in on a right-handed hitter / away from a lefty.”

Original post ↗

Embedded from TikTok; credited and never rehosted.

Trusted mind · TikTokJun 2026

College aces show their grips

NCAA Baseball’s grip tour — Chase Dollander, Paul Skenes, Jac Caglianone and Rhett Lowder showing how they actually hold the ball.

“Take a look at these aces' pitch grips: Chase Dollander, Paul Skenes, Jac Caglianone, and Rhett Lowder.”

Original post ↗

Embedded from TikTok; credited and never rehosted.

Heritage file · XNov 2018

Rivera passes the cutter hand to hand

Mariano Rivera walks Roy Halladay and Scott Kazmir through the cutter grip itself: pitching knowledge preserved as a lesson, not flattened into a stat line.

Original post ↗

Embedded from X; credited and never rehosted.

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04The Other Doors

Keep the craft in view.

Follow a pitcher’s decisions, recover a forgotten experiment, or take a familiar grip into another part of the game.

The Craftsmen

The hold is one part of the pitch. Read the choices, convictions, and turning points of the people who threw it.

Step into the hall

Lost Pitches of the Negro Leagues

Names and eyewitness accounts preserve pieces of a craft that film did not catch. Read what survives, and see where the record falls silent.

Enter the archive

SoftballThe fastpitch & slowpitch wingOpen The Grip LibraryEvery grip, in the handOpen Why it existsThe case for a living museumOpen

05The Record

Preserve the pitches baseball almost forgot.

Open a grip. Follow a story. Leave a firsthand observation for the next person who comes looking.

Open the Pitch Index The lost pitches

Plate 273, Baseball, pitching (1887)Eadweard Muybridge photographed this delivery for Animal Locomotion. The pitcher at each chapter mark above is traced from it. Public domain. Source

Every grip filed before the arm forgets it. Every claim still wearing its source.

Follow the archive back to its records: 299 sources in the citation registry, retrieved through September 23, 2026. How a claim is filed

The pitch, in your hand.

Every grip opens a story.

Adam Wainwright

Rube Foster's Fadeaway

Follow the seam.

The filed set.

From one hand to another.

Keep the craft in view.

Preserve the pitches baseball almost forgot.

The pitch,
in your hand.

Every grip
opens a story.

Follow
the seam.