wPDI for Relief Pitchers: Mid-August Update
Previously, I provided the mid-August Weighted Plate Discipline Index (wPDI) update for starting pitchers. We took a deeper look at some rookies and comeback players found atop the wPDI leaderboard. Players such as Brendan McKay, Zac Gallen and Dinelson Lamet were highlighted by their deceptive repertoire.
Now it’s time to tackle the relief pitchers.
You can find the definitions and indexes of wPDI in its introductory article, found here. Here is a quick reminder on what the six possible plate discipline outcomes look like:
Outcome | Outcome | Outcome | Outcome | Outcome | Outcome | |
---|---|---|---|---|---|---|
A | B | C | D | E | F | |
Zone? | Out of Zone | Out of Zone | Out of Zone | In Zone | In Zone | In Zone |
Swing? | Swung On | Swung On | No Swing | Swung On | Swung On | No Swing |
Contact? | No Contact | Contact Made | No Swing | No Contact | Contact Made | No Swing |
Let’s take a look at the 2019 year to date wPDI leaderboards, for relief pitchers [minimum 15 IP]: