Last year I did a two part series on plate discipline that delved into a few statistics that I thought better represented a batter’s actual plate discipline than your traditional metrics. The stats are in for the 2006 season, so I figured it’d be worth taking another look. Here’s a quick recap of last year’s findings:
Z% (Zone Percentage) – The percentage of pitches a batter sees inside the strike zone. Correlates with walk rate (BB%) and home runs per fly ball ( HR/FB). Batters with more power are pitched more cautiously resulting in a lower Z% and a higher BB%.
OSwing (Outside Swing Percentage) – The percentage of pitches a batter swings at that are outside the strike zone. Correlates with walk rate (BB%). This year, OSwing will be represented as OSwing above the MLB average.
Contact (Contact Percentage) – The percentage of times a batter makes contact with the ball when he swings the bat. Correlates with strikeout rate (K%) and home runs per fly ball (HR/FB). Batters who can’t make contact with the ball obviously strike out more often, and batters who swing “harder” often make less contact, resulting in higher HR/FB and more strikeouts.
So, with the recap out of the way, let’s look at some year to year correlations for all three for the first time.

They all correlate well from year to year, but Both OSwing and Contact correlate extremely well. I consider OSwing about the best measure of plate discipline since not swinging at pitches outside the strike zone is pretty much the definition of plate discipline.
Seeing that it correlates so well from year to year (at least in 2005 & 2006) suggests that players do not quickly develop plate discipline. Perhaps it’s a skill that can be learned over time, but there are few players who saw drastic changes in OSwing from 2005 to 2006. Less than 10% of all players with 300 at-bats in 2005 and 2006 saw more than a 5% change in OSwing from 2005 to 2006.
Name Dif Name Dif
Andruw Jones 8.09% Jeromy Burnitz -5.10%
Geoff Jenkins 7.13% Dave Roberts -5.34%
So Taguchi 6.97% Mark Loretta -5.38%
Willy Taveras 6.62% Freddy Sanchez -5.66%
Aaron Miles 6.16% Vladimir Guerrero -5.71%
Scott Hatteberg 6.08% Jay Payton -5.89%
Joe Crede 5.92% Kevin Mench -6.82%
Jorge Cantu 5.13% A.J. Pierzynski -7.50%
Eric Chavez 5.08% Clint Barmes -8.39%
Contact showed an even higher correlation from year to year than OSwing, also suggesting that players don’t really change their approach from year to year. In fact, there were only 10 players who had more than a 5% change in Contact from 2005 to 2006.
Name Dif Name Dif
Corey Patterson 5.10% Brad Wilkerson -8.87%
Mike Piazza 5.17% Bill Hall -7.41%
Adam Everett 5.51% Nick Swisher -7.02%
Reed Johnson 5.71% Chris Shelton -6.37%
Troy Glaus 6.71% Craig Monroe -5.21%
Finally, Z% showed the least amount of correlation from year to year, but it wasn’t a poor correlation by any means. The decreased correlation I suspect is due to this metric not being entirely within the batters control. While how a batter is pitched is indicative of his various skills (mainly power and overall plate discipline), it’s still up to the pitcher to decide how to proceed.
Between both Contact and OSwing there appears to be a sort of “sweet spot” for batters. Let’s apply some filters to OSwing and see what happens. Particularly, let’s look at power batters who have a HR/FB greater than 15%.
For the first list, let’s limit the batters to those who have “considerably better” plate discipline than the rest of the league. Let’s call “considerably better” an OSwing of 5% or more than league average.
Name Contact HR HR/FB
Jason Giambi 80.97% 37 20.00%
Morgan Ensberg 74.65% 23 16.43%
Barry Bonds 85.78% 26 16.56%
Nick Johnson 84.53% 23 15.97%
Pat Burrell 79.50% 29 18.13%
Jim Thome 71.92% 42 27.81%
Chipper Jones 82.27% 26 19.12%
Frank Thomas 86.58% 39 17.41%
Carlos Beltran 84.08% 41 21.13%
Adam Dunn 70.42% 40 22.22%
Troy Glaus 75.66% 38 18.72%
Jason Bay 75.26% 35 18.82%
Nick Swisher 71.07% 35 17.86%
Austin Kearns 74.11% 24 15.29%
If we move to the next list, which I’ll use the same criteria for, but instead of batters who are “considerably better”, this will just be batters who have “above average” plate discipline (OSwing between 0% and 5% above league average).
Name Contact HR HR/FB
Josh Willingham 79.31% 26 15.85%
David Ortiz 77.92% 54 26.09%
Albert Pujols 86.24% 49 22.48%
Casey Blake 82.82% 19 16.67%
Raul Ibanez 80.26% 33 16.50%
Jim Edmonds 73.31% 19 16.81%
Travis Hafner 72.73% 42 30.22%
Lance Berkman 79.24% 45 24.59%
Phil Nevin 72.79% 22 21.57%
Jermaine Dye 78.26% 44 25.43%
Bill Hall 71.97% 35 19.44%
Brad Hawpe 73.98% 22 16.18%
Paul Konerko 82.11% 35 17.50%
Moises Alou 85.24% 22 17.46%
Andruw Jones 72.94% 41 22.04%
Richie Sexson 69.40% 34 19.32%
Mark Teixeira 79.93% 33 15.94%
Alex Rodriguez 74.27% 35 20.23%
Mike Piazza 81.88% 22 17.05%
Ken Griffey Jr. 80.70% 27 18.00%
Manny Ramirez 78.46% 35 23.49%
Miguel Cabrera 80.65% 26 15.57%
Adrian Gonzalez 79.93% 24 15.69%
Next up are the batters who have “below average” plate discipline (OSwing between 0% and 5% below league average).
Name Contact HR HR/FB
Ray Durham 88.15% 26 15.95%
Adam LaRoche 76.81% 32 21.19%
Marcus Thames 73.19% 26 17.11%
Carlos Delgado 74.39% 38 22.89%
Ty Wigginton 76.38% 24 16.90%
Carlos Lee 86.49% 37 16.09%
Ryan Howard 67.49% 58 39.46%
Mike Cuddye 76.26% 24 15.69%
Aramis Ramirez 84.28% 38 15.14%
Juan Rivera 84.38% 23 17.69%
Mark Teahen 79.05% 18 16.51%
Craig Wilson 70.20% 17 15.74%
Craig Monroe 74.79% 28 15.14%
Matt Holliday 78.84% 34 20.00%
Prince Fielder 76.55% 28 15.82%
Vernon Wells 83.45% 32 15.02%
Torii Hunter 78.02% 31 18.34%
Wilson Betemit 76.67% 18 18.00%
Preston Wilson 76.26% 17 16.67%
Miguel Tejada 84.33% 24 15.48%
And finally, the batters who have “considerably worse” plate discipline (OSwing of 5% or more below average).
Name Contact HR HR/FB
Jeromy Burnitz 72.47% 16 16.00%
Ben Broussard 77.00% 21 15.56%
Justin Morneau 81.07% 34 16.43%
Rocco Baldelli 77.09% 16 16.00%
Jacque Jones 73.82% 27 25.47%
Alfonso Soriano 73.92% 46 18.25%
Jeff Francoeur 76.47% 29 15.26%
Vladimir Guerrero 83.15% 33 16.34%
Now that you’ve seen the lists, it seems clear to me at least, that it’s preferable to have above average plate discipline. Some of the guys in the below average list are borderline, but for the most part, it’s just not as prestigious a list.
The “considerably worse” list is fascinating, since some of these players actually get away with such an aggressive approach. Vladimir Guerrero, who swings at pretty much everything, is talented enough to get away with it. Justin Morneau got away with it last year, but it’s worth noting his plate discipline didn’t improve from 2005 to 2006 and his 2005 season was, fairly forgettable. For what it’s worth, his contact rate did rise by about 3%.
It looks like high contact rates may be able to counter poor plate discipline. It would seem to me that the truly “special” players (with exceptions like Vladimir Guerrero) have that rare combination of power, plate discipline, and contact rates. You see this in players like Barry Bonds, Jason Giambi, Frank Thomas, Carlos Beltran and of course Albert Pujols. Of course, this isn’t the be-all-end-all filter, since there are a few players who sneak in like Casey Blake, who I wouldn’t consider particularly special.
So far we’ve looked at players who had at least 300 at bats, but maybe it’s possible to identify some breakout players from batters who had less than desired playing time.
Here are the players in 2006 who had an OSwing greater than -2% below average and a HR/FB over 12%. I relaxed the HR/FB filter slightly since being able to hit for power might not be quite there yet in younger players.
Name Contact HR HR/FB
Hideki Matsui 87.70% 8 12.12%
Gabe Gross 76.60% 9 14.06%
Chris Snyder 80.31% 6 12.24%
David Dellucci 73.62% 13 14.44%
Greg Norton 76.61% 17 17.89%
J.J. Hardy 85.78% 5 13.89%
Derrek Lee 81.04% 8 15.09%
Corey Koskie 77.05% 12 17.14%
Damion Easley 83.13% 9 14.06%
Aaron Guiel 77.69% 7 17.07%
Luke Scott 78.83% 10 14.71%
Jason LaRue 71.65% 8 15.69%
Wes Helms 77.88% 10 14.71%
Freddie Bynum 72.73% 4 15.38%
Ben Johnson 72.95% 4 12.90%
Michael Napoli 68.34% 16 17.20%
Chris Duncan 77.25% 22 29.33%
Scott Spiezio 80.91% 13 13.83%
Corey Hart 75.84% 9 12.16%
Russell Branyan 63.90% 18 22.50%
Dave Ross 71.51% 21 23.86%
Yorvit Torrealba 78.96% 7 16.28%
Ryan Doumit 74.43% 6 14.63%
Marlon Anderson 81.94% 12 13.79%
Daryle Ward 77.90% 7 15.22%
Josh Bard 85.16% 9 15.79%
Carlos Quentin 74.38% 9 18.00%
Joe Borchard 70.60% 10 17.54%
Cody Ross 76.85% 13 14.77%
Adam Melhuse 73.71% 4 14.81%
This is by no means a “magic bullet” list, but I’d consider it one of many starting points for narrowing down possible breakout players. There are certainly a few players on this list such as Josh Bard, Chris Duncan, Luke Scott, and others that appear to be quite promising. It’s also a reminder that injured players shouldn’t be forgotten such as Derrek Lee, Hideki Matsui, and David Dellucci.
If you were to look at the same list last year, out of about 30 players, you’d have identified Frank Thomas, Jim Thome, J.D. Drew, Mark DeRosa, Milton Bradley, Matt Murton, Ty Wigginton, Nomar Garciaparra, Marcus Thames and Curtis Granderson. So, about one third of the players ended up being at least decent to excellent sleepers.
If you’re still with me, we’ll look at one last list of filters, which I’d consider a sort of potential breakout power hitter list with already established players. I’ll filter on players with an above average OSwing, a contact rate between 70% and 85%, a HR/FB greater than 7.5%, and players all under the age of 30.
Name Contact HR HR/FB
Ryan Langerhans 76.50% 7 8.54%
Jhonny Peralta 73.48% 13 9.22%
Bobby Crosby 77.88% 9 9.09%
Jonny Gomes 70.95% 20 13.33%
Rickie Weeks 73.58% 8 9.09%
Jose Bautista 77.72% 16 11.59%
Chris Shelton 73.46% 16 12.60%
Edwin Encarnacion 80.15% 15 12.10%
Curtis Granderson 70.84% 19 11.66%
Matt Murton 83.57% 13 13.54%
Jeremy Hermida 78.88% 5 6.17%
Last year, using the same filter, yielded a group of 15 batters who hit 190 home runs in 2005 and 266 home runs in 2006. The group included Carlos Beltran, Grady Sizemore, Mark Teahen, Nick Swisher, Brad Hawpe, and others.
The bottom line is, that since stats like OSwing and Contact do correlate so well from year to year, it would definitely make sense to include them in a projection system (instead of me boring you to death with random filters). I’d say Contact is arguably better than using strikeouts, and OSwing is really unlike any of the traditional statistics that would go into projections.