It's one of the hardest things in sports to execute. It gives the opposition fits when thrown properly. It can ruin a career.
The curveball has been around for ages and has taken many forms throughout the history of baseball.
There's the looping 12-6 curveball, which drops off the table just as the hitter thinks he has a read on it. A curveball can also be thrown with some velocity in an attempt jam a hitter. And let's not forget the classic knee-buckling curveball that has made countless hitters look foolish.
This list is composed based not just on the nastiness of the curveball but also on how effectively it was used along with the pitcher's other weapons.
Enjoy this run through the 10 best curveballs in the history of baseball.