Why We Missed: Yelich & Peralta
The offseason always gets my mind wandering and looking for coincidences that eventually lead to projection adjustments. In my contemplations, I stumbled on Christian Yelich and David Peralta exceeding expectations while posting groundball rates over 50%. To maintain this high groundball rate, they must use a fairly flat swing. This information by itself is completely useless but when combined with the latest pitching trend of high fastballs, I thought I may have something. I decided to mash these two ideas together to see if groundball (i.e. level swing) hitters are beating their projections as the league throws more high fastballs. For those wanting the condensed version, they don’t. For those who like numbers, continue.
Pounding the top of the strike zone helps to limit the damage done by hitters with positive launch angle swings. A high straight pitch means the bat’s barrel has limited time in the area of solid contact. Pitchers have figured out the greatness of the high fastball and have been throwing it more.