01 / The hold
Begin with the written account.
The grip beside these steps is the sourced reference. A separate fingertip map, seam model and master-variant record are not documented here.
Read the sources in this fileBreaking
Screwball
The curve’s mirror — breaking the other way, in on the same-handed hitter.
GripReputable analysisLast checked June 7, 2026Open question: none on file
Study this grip →01 / From the circle
Start with the hold.
Keep the written grip in view. Follow its sourced spin and movement, one account at a time.
The complete written record
The spin
Reverse sidespin from the curve — the axis flipped to break arm-side.
The movement
Breaks in on a same-handed hitter, the opposite direction from the curve.
The screwball is the curve run in reverse: it breaks arm-side, in toward a same-handed hitter, off spin turned the opposite direction. Together the curve and the screw let a windmill pitcher move the ball both ways across the plate off one delivery.
The physics
The screwball is the curve’s physics run in reverse: the same real sidespin Magnus break, the axis flipped so the ball moves arm-side — in toward a same-handed hitter — instead of glove-side. Like the curve, and unlike the rise, the movement is honest. It is the spin doing exactly what the spin should.
The job
Role in an arsenal
Jams same-handed hitters and completes the two-way horizontal attack.
Every line above is one click from its source. Still to come for the circle: the full grip geometry and a 12″ seam, the way the baseball wing files a pitch.
Others in the breaking
What did you notice? Ask about a detail, share a firsthand observation, or add a source to the conversation.