When you look at players like Matt Harvey and Mike Trout, you think of players who are the future of Major League Baseball.
There are multiple other players who have performed just as well as those two, setting the bar even higher in 2013.
However, there are certain young players who have faltered this year. And they've faltered beyond the point of explanation.
Here's a look at eight young MLB players who have regressed the most in 2013.
Note: Players used are 27 or younger.