Let’s continue on with our look at the plate discipline metrics by moving onto swinging strike percentage (SwStk%). With a strong correlation of 0.77 (qualified batters from 2015-2019), SwStk% is a good proxy for strikeout rate and the two will usually move in the same direction. Because SwStk% uses a denominator of total pitches, versus K%’s use of plate appearances as its denominator, it takes far less time for SwStk% to become meaningful. As such, the value of the metric increases in a shortened season like 2020. So let’s review the 2020 batter SwStk% improvers.

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Earlier this week, I wrote up a team of guys who could be top 75 players next year. It is a different way to write about breakouts and I want to run it back today with some deeper breakouts. These guys have a real shot at being top 150 players in 2021 which for reference is where guys like Jorge Soler and Yasmani Grandal are being drafted meaning these would be high impact pieces of your team if they panned out.

Max Stassi, C 336 ADP

His awesome 2020 was undercut by only playing 31 games so you may not have noticed that he hit 7 HR and 20 RBI with a .278/.352/.533 line in 105 PA. With Jason Castro gone, the job is clear for Stassi to take on full time and sit just once a week for rest. Stassi has a strong glove reputation and the bat might be catching up.

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Yesterday, I identified and discussed the hitters that improved their O-Swing% the most versus 2019. Today, I’ll check in on the other side of the ledger. While I titled this post “decliners”, what that really means is a decline in skill, assuming a lower O-Swing% is representative of greater skill. So these are the hitters whose O-Swing% increased the most versus 2019.

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The Plate Discipline stat section provides us with a lot of “underlying skill” information. Since these metrics use a denominator that grows more quickly than more traditional metrics such as strikeout and walk rates, they are more useful over small sample sizes, especially after a short season. So let’s now move on to hitter O-Swing% to learn which hitters reduced their swing rate on pitches outside the strike zone and which swung more often at such pitches. Since 2019, O-Swing% had about a -0.74 correlation with walk rate, so it’s clearly that holding back on swinging on pitches outside the zone is an excellent indicator of plate patience and current/future walk rate.

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Yesterday, I reviewed the biggest hitter Z-Contact% improvers. Today, let’s flip to the decliners.

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In a recent episode of the podcast, I spoke with Alex Fast about some potential breakout starting pitchers at different levels and I really enjoyed that so I want to do the same for hitting. Today, we are going to identify some players who be the next Top 75 players. Just to give you an idea of that range, hitters like Pete Alonso and Adam Duvall were just inside in the Top 75 while Eric Hosmer and Kevin Pillar were juuust outside. So these are solid fantasy contributors for sure.

Sean Murphy, C | 205 ADP, 280 Player Rater

Murphy has been strong in two small MLB samples, totaling exactly 200 PA of a 132 wRC+ with 11 HR. The 27% K rate is born of no plan at the dish or a stark inability to make contact meaning there could be some improvement there, pushing his .237 AVG northward. The power will drive this profile and be a huge factor in whether or not he can reach this level while he also needs to be much closer to his MiLB .267 AVG, too.

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Let’s move along in our 2020 review of underlying skill metrics to the plate discipline rates. While the shortened season makes it difficult to evaluate many metrics, and especially counting stats, plate discipline rates don’t take as long to reach a reasonable sample size because it uses a pitch-based denominator which ends up as a larger number than most other rate denominators. From 2015 through 2019, Z-Contact% had a correlation coefficient with K% of about -0.82 when requiring a minimum of only 100 plate appearances. That’s pretty darn strong! So let’s review and discuss the Z-Contact% improvers versus 2019, that recorded at least 100 plate appearances in each season.

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Yesterday, I listed and discussed the fly ball pull percentage (FBP%) surgers versus 2019. Though the shortened 2020 season means we have far smaller samples sizes to evaluate and significantly less meaningful data, changes to batted ball type data like fly ball rates, pull rates, and fly ball pull rates, are worth noting. They could signify a real change in plate approach that could carry over to 2021. Today, let’s review the hitters whose FBP% dropped the most versus 2019.

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Since 2015, pulled fly balls have left the park 33.1%, while the HR/FB rates of balls hit to the center of the park and opposite field sat at just 8.9% and 4.4%, respectively. Clearly, if a batter is trying to hit a home run, pulling his fly balls should give him the best chance. So knowing how important pulling fly balls is to hitting home runs, let’s review the fly ball pull percentage (FBP%) surgers versus 2019. I’ll discuss the interesting and fantasy relevant names.

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11/10/20

The latest episode of “The Sleeper and the Bust” is live. Support the show by subscribing to Fangraphs! With a standard $20 membership, you help maintain and improve our database of stats and graphs as well as our staff of 8 full-time employees and over 50 contributors. The premium ad-free membership at $50 year supports site growth and also includes faster load speeds and better site performance. You can also support monthly for just $3.

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