Pitch Grips: Curveballs
Curveballs are meant to slower pitches that have significantly more vertical drop than other pitches. Most curveballs move in a 12-6 or 1-7 fashion. A good curveball can be paired well with fastballs to take advantage of tunneling.
The curveball grip can vary between players.
The movement from a curveball comes from an athlete’s throwing with a supinated grip (thumb pointing behind the body) though release. This causes the athlete’s hand to be on the side of the ball with the tips of the fingers on top, enabling the athlete to get topspin on the ball.