This is a decent piece on what could possibly be going on with Berrios. Basically he needs a new pitch. His two seamer and four seamer are really similar in shape, velocity and spin rate, and his two off speed pitches are are slurve and a change up with similar velocity and not a ton of movement. Then the issue of his pitches catching too much of the plate. Hitters can sit on fast or slow because that’s essentially what his pitches amount to.
https://bluejaysnation.com/news/theo...rios-struggles