Weighted Plate Discipline Index (wPDI): 2019 Review
In my previous article, I gave an update on my Weighted Plate Discipline Index (wPDI) metric. wPDI arises from the core ingredients of plate discipline – looking only at zone rates, swing rates and contact rates.
An important distinction regarding wPDI, is that its sample size is quite a bit larger than other statistics. Many other stats are based on innings pitched, or even per plate appearance. The denominator of wPDI is pitches. While batter outcomes such as strikeouts and walks stabilize fairly quickly, wPDI can work even faster.
Let’s now take a look at the 2019 leaderboards for wPDI, to see if we can find some undervalued players.
Starting Pitchers
Name | IP | wPDI |
---|---|---|
Blake Snell | 107.0 | .380 |
Chris Sale | 147.3 | .379 |
Gerrit Cole | 212.3 | .374 |
Justin Verlander | 223.0 | .373 |
Stephen Strasburg | 209.0 | .370 |
Zac Gallen | 80.0 | .365 |
Mike Clevinger | 126.0 | .362 |
Yu Darvish | 178.7 | .359 |
Max Scherzer | 172.3 | .358 |
Kenta Maeda | 153.7 | .357 |
Charlie Morton | 194.7 | .357 |
Lucas Giolito | 176.7 | .356 |
Patrick Corbin | 202.0 | .355 |
Luis Castillo | 190.7 | .355 |
Aaron Nola | 202.3 | .355 |
Kevin Gausman | 102.3 | .353 |
Jacob deGrom | 204.0 | .353 |
Collin McHugh | 74.7 | .353 |
Shane Bieber | 214.3 | .352 |
Jose Berrios | 200.3 | .352 |
Kyle Gibson | 160.0 | .350 |
Andrew Heaney | 95.3 | .350 |
Chris Archer | 119.7 | .350 |
Dylan Bundy | 161.7 | .348 |
Felix Pena | 96.3 | .348 |
Zack Greinke | 208.7 | .348 |
Robbie Ray | 174.3 | .348 |
Matthew Boyd | 185.3 | .347 |
Domingo German | 143.0 | .347 |
Joshua James | 61.3 | .347 |
Hyun-Jin Ryu 류현진 | 182.7 | .347 |
Carlos Carrasco | 80.0 | .346 |
Jack Flaherty | 196.3 | .346 |
Dinelson Lamet | 73.0 | .346 |
Sam Gaviglio | 95.7 | .346 |
Jose Urquidy | 41.0 | .344 |
Tommy Milone | 111.7 | .343 |
Rich Hill | 58.7 | .343 |
Griffin Canning | 90.3 | .342 |
Kyle Hendricks | 177.0 | .342 |
James Paxton | 150.7 | .342 |
Sonny Gray | 175.3 | .340 |
Eduardo Rodriguez | 203.3 | .340 |
Frankie Montas | 96.0 | .340 |
Walker Buehler | 182.3 | .340 |
Freddy Peralta | 85.0 | .340 |
German Marquez | 174.0 | .339 |
Brendan McKay | 49.0 | .339 |
Francisco Liriano | 70.0 | .339 |
Trevor Bauer | 213.0 | .338 |
Miles Mikolas | 184.0 | .337 |
Alex Young | 83.3 | .337 |
Carlos Martinez | 48.3 | .336 |
Chris Paddack | 140.7 | .336 |
Ross Stripling | 90.7 | .335 |
Mike Minor | 208.3 | .335 |
Clay Buchholz | 59.0 | .335 |
Michael Pineda | 146.0 | .333 |
Noah Syndergaard | 197.7 | .333 |
Masahiro Tanaka | 182.0 | .333 |
Austin Voth | 43.7 | .333 |
Joe Musgrove | 170.3 | .333 |
Trevor Richards | 135.3 | .332 |
Gio Gonzalez | 87.3 | .332 |
Thomas Pannone | 73.0 | .332 |
Clayton Kershaw | 178.3 | .332 |
Tony Gonsolin | 40.0 | .331 |
Jake Odorizzi | 159.0 | .331 |
Caleb Smith | 153.3 | .331 |
Mike Soroka | 174.7 | .331 |
Max Fried | 165.7 | .330 |
John Gant | 66.3 | .330 |
Madison Bumgarner | 207.7 | .330 |
Above is the 2019 wPDI leaderboard for starting pitchers.
Blake Snell lead all starting pitchers in wPDI in 2019. The key to Snell’s success was his “out of the zone” plate discipline. In particular, Snell’s Outcome A (out of the zone, swung on and missed) was the 2nd highest of all qualified pitchers in baseball. In 2019, Blake produced a K% rate of 33.3%, the highest of his career. He logged a whopping 147 strikeouts in just 107 innings pitched. Both FIP and xFIP (3.32 & 3.31 respectively) agree that his 4.29 ERA last year was somewhat unlucky.