http://bats.blogs.nytimes.com/2010/07/01/how-mariano-rivera-dominates/
Most Yankees fans are aware that the key to Mariano Rivera's success as a closer has been his signature cutter. But to understand exactly how this pitch has worked for Rivera, watch the above video. The Times's Graham Roberts, Shan Carter and Joe Ward have put together an eye-opening interactive graphic to accompany James Traub's profile of Rivera in Sunday's Magazine.
Very interesting to watch.