Do seams on the baseball influence the flow (or are they just for holding the skin together)?

(Hint: asymmetric flow separations)

We hear about many different types of pitches: how do these balls behave and how are they pitched?

Baseball Pitch Simulation

Knuckle ball, junk ball, fork ball, screw ball, curve ball, slider, etc.

All photos by H. Higuchi and C. Knisley