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Early Plate Discipline Standouts

In 2019, I introduced a new (yet simple) statistical metric which focuses on the core ingredients of plate discipline. The Weighted Plate Discipline Index (wPDI) looks at the following basic binary events:

  • Was the ball thrown in the zone?
  • Was the ball swung on?
  • Did the batter make contact with the ball?

Weighted Plate Discipline Index (wPDI) does not look at exit velocity, barrels, or quality of contact. It doesn’t look at walk rates or strikeout rates, or at any other plate appearance result.

wPDI focuses solely on pitches. Is the pitch in the zone? Did the batter swing at the pitch? Did the hitter contact the pitch? That’s all.

Be sure to check all of our fantasy baseball lineup tools and weekly lineup resources:

 

wPDI Matrix

By answering the three binary questions above, each and every pitch can be classified into one of the following tracked six outcomes.

Outcome A Outcome B Outcome C Outcome D Outcome E Outcome 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

Each plate discipline outcome can be enumerated, and subsequently expressed as a percentage of all pitches thrown. By indexing each outcome appropriately, and by aggregating in linear fashion - wPDI can be used as an accurate representation of many other statistics (called strikes, whiffs, strikeouts, walks, etc.). wPDI can also find undervalued deceptive pitchers.

The Maddux Plate Discipline Index (mPDI), named after Hall of Fame pitcher Greg Maddux, is modeled after his famous quote about pitching:

“The key to pitching is to have the ability to throw a strike when they’re taking and throw a ball when the hitter is swinging.”

The Maddux Plate Discipline Index (mPDI) is a special case of wPDI. For pitchers, this would be represented by the following quantity:

Outcome A + Outcome B + Outcome F
Total Pitches

As for batters, we would need to consider the exact inverse of Maddux’s quote. The key to hitting would be to swing when the ball is in the zone, and to lay off when the ball is out of the zone. The Maddux Plate Discipline Index (mPDI) for hitters captures all of the other plate discipline scenarios. In terms of the six defined outcomes above, mPDI for hitters is defined as:

Outcome C + Outcome D + Outcome E
Total Pitches

Today’s article focuses on the mPDI leaderboard for hitters through May 4. An awful mPDI would be one in the upper .500s, while an elite one would approach .800. An mPDI of .685 is about average thus far for 2021.

Let’s now go through a few early Maddux Plate Discipline Index studs. We will dive into some of their underlying metrics in the early going of the season, as well as their specific plate discipline component outcomes.

 

mPDI Leaders

First, let’s take a look at the current mPDI leaderboard for 2021. Below are the top plate discipline batters with a minimum of 30 plate appearances:

Player mPDI
Mike Tauchman .805
Jordan Luplow .792
Roman Quinn .780
Brandon Belt .777
Ronald Acuna Jr. .773
Matt Joyce .772
Tucker Barnhart .770
Chris Taylor .766
Curt Casali .765
Josh Donaldson .760
Tommy Pham .758
Andrew McCutchen .757
Josh VanMeter .754
Ty France .753
Joe Panik .753
Alec Bohm .753
Freddie Freeman .752
Jacob Stallings .751
Joey Votto .751
Tony Kemp .750
Josh Bell .750
Austin Barnes .750
Jed Lowrie .747
Dansby Swanson .747
Corey Seager .747
Zack Collins .747
Victor Robles .747
Jeff McNeil .744
Luke Raley .743
Dylan Carlson .743
Ryan McMahon .742
Robbie Grossman .740
Kole Calhoun .740
Gleyber Torres .740
Jon Berti .740
Travis d'Arnaud .737
Yandy Diaz .736
Juan Soto .736
Jake Bauers .736
Justin Turner .735
Kyle Lewis .734
Kyle Schwarber .734
Matt Duffy .734
Matt Carpenter .733
J.D. Davis .733
Yoan Moncada .733
Vladimir Guerrero Jr. .733
Ehire Adrianza .733
Rougned Odor .732
Brett Phillips .732
Joey Gallo .730
Miguel Sano .730
Chance Sisco .729
Anthony Rendon .727
Edwin Rios .727
Mike Trout .727
Clint Frazier .726
Kyle Tucker .725
Andrew Benintendi .725
Max Kepler .725

 

Mike Tauchman, New York Yankees

After just 11 games played as a member of the crowded Yankees, Mike Tauchman was traded to the San Francisco Giants. With a career wRC+ of 101, Tauchman should have had a regular major league role, but was marginalized in New York. He offers a good defensive glove and a hint of speed.

But what jumps out in Mike's first 33 plate appearances of the season is his eye. Tauchman's .805 mPDI currently leads all of baseball. Looking into his Maddux Plate Discipline components - Tauchman has so far excelled in strike recognition.

Player mPDI Outcome C Percentile Outcome D Percentile Outcome E Percentile
Mike Tauchman .805 71% 97% 88%

His in-zone plate discipline outcomes (Outcomes D & E) are elite. Almost 40% of all the pitches thrown to Tauchman are in the zone and are swung on. His called strike rate is less than 10%.

Tauchman hasn’t walked much thus far in 2021 (just 1 BB). But as his career walk rate is 12%, and was 13% last season, you should expect a rise from here on in.

The Giants have been splendid in April, and I envision Tauchman getting plenty of opportunity in the short term this May. If he continues to bat near the top of the lineup, he will also get a large boost in his run production counting stats – which is pertinent for your fantasy leagues. Keep an eye out on Tauchman.

 

Jordan Luplow, Cleveland Indians

Next on the mPDI list is Jordan Luplow.

Player mPDI Outcome C Percentile Outcome D Percentile Outcome E Percentile
Jordan Luplow .792 98% 54% 55%

In terms of plate discipline, his strength is his “ball” detection. Nearly half of the pitches thrown to him are out of the zone and not swung on (an Outcome C of 49%). His walk rate this season is up over 16%, which is even higher than his 12% career average.

Heading into the season, Luplow was thought of as a platoon hitter. His lefty-righty splits are spread wide apart. His career wRC+ vs. left-handed pitching is a tremendous 154, whereas his wRC+ vs. RHP is just 64. This season, Jordan is even getting more consistent playing time. His 6 HRs are split evenly against right-handed and left-handed pitching.

Ignore Luplow’s low batting average to start the season of .183, which is largely BABIP aided. A BABIP of .135 is quite an unlucky mark. Otherwise, he is having his best season to date. In addition to the rise in his walk rate (mentioned above), he is barreling balls at the highest rate of his career (16%), his exit velocity is up 2 MPH from his norm, and his run production per plate appearance has risen to new heights.

As long as Luplow continues to get playing time, and especially if Cleveland continues to bat him in the two-hole, he will be fantasy relevant. Continue to monitor this Maddux Plate Discipline stud. Scoop him up off the waiver wire in moderate to deep leagues.

 

Brandon Belt, San Francisco Giants

Brandon Belt is having a nice start to the 2021 season, with six HR and 18 RBI. Despite a career-high strikeout rate (33%), mPDI believes that Belt has been a plate discipline stud. At .777, Belt’s mPDI is ranked fourth in the major leagues.

Player mPDI Outcome C Percentile Outcome D Percentile Outcome E Percentile
Brandon Belt .777 94% 72% 64%

Belt not only excels in out-of-zone recognition (Outcome C), but he also identifies strikes well (Outcomes D & E). He is superb across the board in all of the Maddux Plate Discipline categories, with an elite eye for "balls."

Aside from an excellent 16% walk rate to start 2021, Belt is barreling balls at a 20%+ clip – which has boosted his hard-hit rate over 50%.

Throughout his career, Brandon seems to perform well early on in the season. His 137 career wRC+ in the month of May is the best of his monthly splits. His career batting average in May is a robust .274. Now would be the optimal time to get Belt into your lineups, and while he is still healthy.

 

Chris Taylor, Los Angeles Dodgers

With a .766 mPDI, Chris Taylor of the Dodgers has been a top 10 Maddux Plate Discipline player. His walk rate has risen to the highest level of his career at 14%, while his strikeout rate has dwindled to its lowest point at 23%. His mPDI plate discipline profile looks similar to that of Jordan Luplow.

Player mPDI Outcome C Percentile Outcome D Percentile Outcome E Percentile
Chris Taylor .766 92% 56% 69%

Looking at Taylor’s Statcast metrics, his exit velocity is sitting 4 MPH above his career average and he is barreling balls at a 12.5% clip (1 out of every 8 events). In 2021, he has produced an xwOBA of .401, confirming his early success.

From a rotisserie perspective, he has more than exceeded his fantasy managers' expectations. The Razzball player rater currently ranks Taylor as the 42nd best player in 5x5 roto - thanks to 24 runs, 4 HR, 3 SB, and a robust .267 BA.

Taylor has taken full advantage of near regular at-bats in the past few weeks. Consider rostering Taylor in shallow leagues, and trading for him in deeper leagues. The Dodgers will have a potent offense once again in 2021, and if he continues to bat high up in the lineup - Taylor could approach 90 runs and 75 RBI on the season.



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