Tommy John surgery is still a dangerous procedure that carries no guarantee of success.

See just how important pitch sequencing really is for pitchers and hitters.

How low can it go?

Going in depth on recovery times, and how pitchers of different ages fare, and which surgeons are doing the work.

For the first time online, here is Jon’s SABR Award-nominated essay from THT 2014.

Does the count, number of outs or number of runners on base affect how hard pitchers throw?

How much of an advantage do hitters gain within a game every time they see a particular type of pitch from the same pitcher?