From the batter's box, every pitch leaves a different seam-rotation signature. Elite hitters read those patterns in the first 50 ms of flight. Here's what they're looking for:

• 4-Seam Fastball Reddish-brownish solid with almost no visible form. The seams spin so fast batters can't pick them up — just a blur of color.
• 2-Seam Fastball The downward, sinking action makes the seams appear as blurred vertical railroad tracks cutting through the ball.
• Slider Looks like a fastball early, then breaks hard. Watch for a red dot at 2 o'clock — the gyro spin axis peeking through as it cuts away.
• Curveball The seams run from 10 o'clock to 4 o'clock like lateral railroad tracks — the only pitch that appears to rise briefly before its sharp downward break.
• Changeup Blurry and solid like a four-seamer — that's the trap. Hitters need sharp foveal vision to catch the off-white tint before it drops off the table.