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The Data Behind MLB's 2023 Rule Changes

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The Data Behind MLB's 2023 Rule Changes

Joe Pompliano
Feb 27
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The Data Behind MLB's 2023 Rule Changes

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Huddle Up is a 3x weekly newsletter that breaks down the business and money behind sports. If you are not already a subscriber, sign up and join 91,000+ others who receive it directly in their inbox each week.


Today At A Glance:

The 2023 Major League Baseball season is less than a month away, and this year’s game will look a lot different. So today’s newsletter breaks down the current state of Major League Baseball and the rule changes that will be implemented this year.


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Friends,

Attention spans have decreased dramatically over the last several decades.

For example, according to a recent digital media study from the University of California, the average human’s ability to focus on a screen has dropped from 2½ minutes in 2004 to an average of 47 seconds today — that’s a 70% decline.

We know this, of course. The iPhone debuted in 2007, and the average user now picks up their phone more than 1,500 times per week. TikTok then introduced 15-second clips in 2016, and teenagers now spend an average of 95 minutes per day on the app.

This transformation has shifted everything — from how we think and live, to the products and services we consume. And when it comes to sports, no league has been impacted more than Major League Baseball (MLB).

Take a look at this chart, for example. Major League Baseball was founded in 1876 and is the world’s oldest major professional sports league. But a shift has occurred over the last 50 years, and baseball is now ranked as America’s third most popular sport.

And that chart is just the tip of the iceberg. Not only do superstars like Aaron Judge and Mike Trout have significantly smaller audiences than their counterparts across football, basketball, and soccer, but MLB teams averaged just 26,566 fans per game last year — that’s MLB’s lowest attendance since their average of 26,509 in 1996.

Instagram Followers By Athlete

  • Aaron Judge: 1.6 million

  • Mike Trout: 2 million

  • Tom Brady: 13.6 million

  • Serena Williams: 16.3 million

  • LeBron James: 147 million

  • Cristiano Ronaldo: 552 million

MLB Total Attendance By Year

  • 2007: 80 million

  • 2010: 73 million

  • 2022: 65 million

Now, several factors are driving this generational decline in interest. For example, the average MLB game in 2022 lasted more than 3 hours, which is a significant commitment considering baseball’s 162-game season.

Average Length Of Game (American sports with 82+ games)

  • NHL (82 games): 2 hours and 20 minutes 

  • NBA (82 games): 2 hours to 2 hours and 30 minutes

  • MLB (162 games): 3 hours and 3 minutes

There has also been a decline in offense, with the 2022 league batting average of .243 being the lowest since 1968. And the average age of an MLB fan has increased from 52 to 57, which is the oldest average age among major American sports leagues.

Average Fan Age By Sports League

  • MLS: 40

  • NBA: 42 

  • NHL: 49

  • NFL: 50

So Major League Baseball has taken notice over the last several years and decided to implement a new set of rules this year designed to improve the pace of play.

Here are a few of the most notable rule changes fans will see in 2023.


Pitch Clock

The most significant change coming in 2023 is the introduction of a pitch clock.

  • Pitchers will have 15 seconds to start pitching the ball when the bases are empty and 20 seconds to start pitching the ball when runners are on base.

  • Hitters are required to step into the batter’s box within the first 8 seconds.

  • If the pitcher doesn’t comply with the rule, the batter will be awarded a ball.

  • If the hitter doesn’t comply with the rule, the pitcher will be awarded a strike.

This rule was specifically implemented to increase the speed of play — and early results indicate it will do just that.

For example, the use of pitch clocks in minor league games last year cut the average game time by 25 minutes, from 3 hours and 3 minutes to 2 hours and 38 minutes. And it appears this will also translate to the big leagues, with the first two games of Spring Training lasting between 2 hours and 29 minutes and 2 hours and 33 minutes.

Twitter avatar for @JeffPassan
Jeff Passan @JeffPassan
Time of game for Padres-Mariners: 2 hours, 29 minutes. Time of game for Rangers-Royals: 2 hours, 33 minutes. This is spring training and a minuscule sample. But it's hard to understate how drastically the pitch clock is going to change baseball.
10:52 PM ∙ Feb 24, 2023
24,081Likes1,349Retweets

Limited Pickoffs

Major League Baseball has also decided to limit pickoffs this season.

  • Pitchers are now only allowed three pickoff attempts for runners on base.

  • But there’s a catch — the first two pickoff attempts result in no consequences. However, if a pitcher does not get a runner out on their third attempt, the play is counted as a balk, and the runner advances to the next base.

This rule was implemented throughout the minor leagues last season and played a crucial role in helping reduce the average game time by 25 minutes.


Larger Bases

Given the reduction in offense over the last several years, Major League Baseball has decided to increase the size of each base from 15 inches to 18 inches.

Twitter avatar for @MLBONFOX
FOX Sports: MLB @MLBONFOX
MLB revealed larger 18x18 bases to debut this season. 📸: @Jack_A_Harris
Image
8:19 PM ∙ Feb 14, 2023
2,494Likes246Retweets

This will reduce the distance between bases by 4.5 inches, and the hope is that it will encourage more base stealing and reduce the risk of injuries (e.g., first basemen getting stepped on and reducing collisions on the basepaths). 

For example, in a 2021 Triple-A trial run, one league saw a 2.2% increase in stolen bases, and another had a 0.7% rate increase. The stolen base success rate also increased by 10% from 68% to 78%.


Defensive Shift Limits

MLB is also hoping that offense will increase by eliminating the defensive shift.

  • The defensive team must have a minimum of four players in the infield.

  • The defensive team must have at least two players on either side of second base.

The data is a bit spotty here, but MLB reportedly expects this rule change to generate an additional 1-2 hits per game (and improve last year’s .243 batting average).


Major League Baseball is also experimenting with several other rule changes. Like robot umpires, for example, which are currently being tested throughout the minor leagues and have reduced game times by an additional 9 minutes on average.

MLB Robot Umpire Overview

  • The umpire keeps an iPhone in their back pocket connected to an earbud; the automated strike zone system signals a ball or strike with an automated male voice into the earbud after each pitch, then the umpire physically states the call. 

  • The TrackMan system uses doppler radar technology, a 3-D dish hung above home plate, to track and identify the pitch’s location, then communicates that information to the iPhone connected to the umpire’s earpiece. 

  • Fun note: The system initially used AirPods in the Atlantic League, but their battery kept dying. So, they switched to a wired earbud.

  • TrackMan can generate each batter’s size and stance to establish an appropriate strike zone (e.g., a 6’ 7” Aaron Judge won’t have the same strike zone as a 5’ 6” Jose Altuve).  

  • Umpires can override a call if there’s an obvious error, like a bounced ball at the plate called a strike. 

  • A TrackMan crew sits in the press box during the game to manage the system's equipment, which includes a laptop that displays the graphic of the strike zone for each individual batter. 

But regardless, the bottom line is clear. Despite bringing in a record $10.8 billion in revenue last year, Major League Baseball has seen the data and has decided to implement several new rules this year to increase offense and the pace of play.

We’ll see how it goes — but the game will undoubtedly look very different.

I hope everyone has a great day. We’ll talk on Wednesday.

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Extra Credit: The World Cup Effect Is Real For MLS

Major League Soccer (MLS) kicked off its 28th season this past weekend, and the early attendance numbers are impressive.

Twitter avatar for @JoePompliano
Joe Pompliano @JoePompliano
MLS is off to a hot start in 2023. Charlotte FC had 69,345 fans at its home opener last night & Atlanta wasn’t far behind with 67,538. That’s close to the NFL’s per game attendance of 69,442 last year. And it’s the first time MLS has had multiple 65,000+ games on the same day.
Image
2:29 PM ∙ Feb 26, 2023
3,432Likes237Retweets

Huddle Up is a 3x weekly newsletter that breaks down the business and money behind sports. If you are not already a subscriber, sign up and join 91,000+ others who receive it directly in their inbox each week.


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The Data Behind MLB's 2023 Rule Changes

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3 Comments
Cheaithanya Pappu
Writes Cheaithanya’s Substack
Feb 28

It’s sad to see our attention span decreasing. We’ve become to attached to our devices and so used to automated behaviour, we don’t tend to realize what it is that we’re are doing

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Dats
Feb 27

Great post, but curious why you filtered out the length of NFL games, which typically last about 3 hours, even though there’s roughly only 15 minutes of game action (WSJ study shows an average play only lasts 4 seconds). That would make them the second longest game if included with baseball, basketball, and hockey, but still waaaay ahead in terms of popularity. I don’t think shortening the time of baseball games is going to increase the popularity of the sport or the following of its star players on social media.

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