RealGM

Video is semi-inconclusive judging by the camera angle and when it cuts out, but boy does it look suspect.

Mariano Rivera Spitball
http://www.halosheaven.com/2009/10/19/1 ... ball-video

Slow-motion
http://www.youtube.com/watch?v=b-KGmVqN-kA

Bahaha at the comments saying I guess the Yankees didn't buy the cameramen. Likely nothing though.

As much as I'd like to believe this about a Yankees player (though not Rivera, really), Deadspin has frame-by-frames of him spitting, and it doesn't end up on the ball:

http://deadspin.com/5385945/spit-takes- ... s/gallery/