Two-Seam Fastball
A fastball variant gripped along the narrow seams that produces arm-side movement and sink, often used to generate ground balls, also called a 'sinker.'
Example Usage
“That two-seamer ran in on his hands and produced a weak ground ball to short.”
Two-Seam Fastball
The two-seam fastball (often called a sinker) is gripped along the narrow seams and produces arm-side movement with downward action. It's designed to generate ground balls and weak contact.
The Two-Seam Grip
Finger Placement
- Index and middle fingers along the narrow seams
- Fingers together or slightly apart
- Thumb underneath on the seam
- Fingers follow the seam direction
Variation
- Pronation at release adds sink
- Pressure on index or middle finger affects movement
- Can be thrown with similar arm speed to four-seam
Movement Profile
Arm-Side Run
- Ball moves toward the pitcher's throwing arm side
- Right-handed pitcher: runs in on right-handed batters
- Left-handed pitcher: runs in on left-handed batters
Sink
- Drops more than a four-seam
- Less backspin, more downward movement
- Produces ground balls
Two-Seam vs. Four-Seam
| Two-Seam | Four-Seam |
|---|---|
| Arm-side movement | Straight |
| Sinking action | Backspin/carry |
| 1-3 mph slower | Maximum velocity |
| Ground balls | Swings and misses |
| Lower in zone | Up in zone |
When to Use It
- Ground ball situation (double play needed)
- Jam hitters on the hands
- Get quick outs
- Keep the ball in the park
Related Terms
Four-Seam Fastball
The straightest and typically fastest fastball variant, gripped across the horseshoe seams with maximum backspin for velocity and carry.
Sinker
A fastball variant with significant downward movement that induces ground balls, typically thrown with two-seam grip and pronation at release.
Fastball
The most fundamental pitch in baseball, thrown with maximum velocity and typically featuring backspin that creates 'rise' or carry through the strike zone.
Ground Ball
A batted ball that hits the ground in the infield before reaching an outfielder, typically the result of contact on the top half of the ball.
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