Sinker
A fastball variant with significant downward movement that induces ground balls, typically thrown with two-seam grip and pronation at release.
Example Usage
“He's a ground ball machine, his sinker has incredible drop.”
Sinker
A sinker is a fastball variant characterized by significant downward movement. The pitch dives as it approaches the plate, producing ground balls and weak contact. Many use "sinker" and "two-seam fastball" interchangeably, though sinkers typically have more pronounced sink.
Sinker Mechanics
Grip
- Usually a two-seam or modified grip
- Fingers along or between the narrow seams
- Pronation at release
Release
- More pronation than standard fastball
- Creates topspin or reduced backspin
- Ball "falls" faster than straight fastball
Movement Profile
- Arm-side run: Moves toward throwing arm side
- Sink: Drops more than four-seam fastball
- Late movement: Action occurs near the plate
Why Sinkers Work
Ground balls are valuable because:
- Lower batting average than fly balls
- Double play opportunities
- Keep ball in the park (no home runs)
- Efficient outs (weak contact)
Sinker Pitchers
Pitchers who rely on the sinker:
- Pitch to contact
- Get quick outs
- Work deeper into games
- Depend on their infield defense
Sinker vs. Four-Seam Strategy
| Sinker | Four-Seam |
|---|---|
| Ground balls | Swings and misses |
| Lower in zone | Up in zone |
| Contact allowed | Strikeout focused |
| Efficient innings | Higher pitch counts |
Some pitchers throw both, using the four-seam elevated and the sinker down in the zone.
Related Terms
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.'
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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