Curveball

The curveball is a breaking pitch with significant downward movement caused by topspin. Unlike fastballs that fight gravity, curveballs work with it, dropping dramatically as they approach the plate.

How a Curveball Works

The physics of a curveball:

• Topspin: Pitcher snaps their wrist, imparting forward spin
• Magnus effect: Spin creates pressure differential
• Downward force: Ball drops more than gravity alone
• Slower velocity: Typically 70-85 mph

Curveball Grips

Standard Curve

• Middle finger along the seam
• Thumb underneath
• Release with wrist snap
• Creates 12-6 or 11-5 movement

Knuckle Curve

• Index finger bent, knuckle on the ball
• Creates a sharper break
• Popularized by Mike Mussina

Spike Curve

• Index finger extended along the ball
• Similar to knuckle curve

Types of Curveballs

Curveballs are often described by their movement on a clock face:

• 12-6 curve: Straight downward drop (12 o'clock to 6 o'clock)
• 11-5 curve: Down and to the glove side
• Slurve: Mix of slider and curve

Famous Curveballs

• Sandy Koufax: Legendary 12-6 curve
• Barry Zito: "Uncle Charlie" with big loop
• Clayton Kershaw: Modern master
• Adam Wainwright: Beautiful looping curve

Nicknames

• Uncle Charlie
• Yakker
• Hook
• The Deuce (old-timey)
• Hammer
• Yellow hammer