For years Mariano Rivera's cutter has been acknowledged as one of the nastiest pitches in baseball. What other current MLB pitcher's pitches would you put in that category? Stephen Strasburg's fastball? Cole Hamel's changeup? Adam Wainwright's curve? Feel free to use data to support your choice. (PITCHf/x, etc.)
Hamels changeup was sick the other night, seen him pitch before but obviously wasn't watching closely enough. One of my favorites would be a healthy Brandon Webb sinker. Sick movement and comes off of bats like a bowling ball.