For now ... own thread. After a little while you can feel free to merge with MLB Discussion.

According to SportScience, the amount of time a hitter has to make a decision on whether or not to swing at a 90 mph fastball is .09 seconds, when you account for the amount of time to find the ball, calculate the velocity, and for the signal to swing to reach the muscles.

Oh, and when the pitch is actually close to the plate, you can't actually "keep your eye on the ball", it's practically invisible.

For a Strasburg 100 mph fastball, the reaction time goes down to .04.

Here's the video: http://espn.go.com/video/clip?id=5311306

Here's other SportScience clips: http://search.espn.go.com/sportscience/