MLB’s dinger surge and juiced baseballs

Photo Credit: Bill Kostroun/New York Post

In the space of about three years, baseball has seen a reversal of fortunate for the batters. Hitters are hitting home runs at historic rates — the single month home run record fell in June — and there has been a rush to figure out why the home run rate has surged; the primary focus has been on changes to the ball itself (aka “juiced baseballs“).

Veterans began to openly discuss the changes they thought had been made to the baseball. They had noticed that the seams seemed lower and that the ball was harder than it had been previously.

The findings in the data have anecdotally been supported by several players and coaches. New York Mets manager Terry Collins said in an interview with the Orange County Register, “The seams on the ball are definitely lower. … And there’s no question that the ball is harder.” Collins joined a chorus of established veterans who claim that the ball has changed this year, including Justin VerlanderAndrew McCutchen and Jake Arrieta.” – Rob Arthur, FiveThirtyEight

This evidence of anecdotal changes to the ball seems to be confirmed by a chart that was created by Arthur in his piece on FiveThirtyEight. Using Statcast, he measured the air resistance of baseballs and compared them against the numbers of dingers that are being hit. There’s a strong correlation between the lack of air resistance on the baseball and the number of dingers that have been hit.


Courtesy of FiveThirtyEight

This increase in home runs has led to some incredible performances, individual and collective, in 2017. Fans have already seen a seven grand slam day, the record for number of home runs in a month fall, and rookie Aaron Judge smash more home runs than any other rookie in Yankee’s history.

The surge in dingers started after the 2015 All Star Game, and the home run rate has only continued to increase since. In fact, we’ve seen more home runs in the the last two seasons than we did any any two seasons of the steroid era combined.

If the juiced ball hypothesis is correct, the crazy thing is that these changes to the balls doesn’t violate MLB rules.

As an earlier ball-testing report by the Baseball Research Center that was publicly released in 2000 acknowledged, “two baseballs could meet MLB specifications for construction but one ball could be theoretically hit 49.1 feet further.” – Ben Lindbergh, The Ringer

The changes to the seams of the ball can be small, still within the regulated variance, and will increase the distance that the ball will fly, which will increase the distance that the ball will fly. And the crazy thing is it wouldn’t take a very large variance in the seam heights to completely change how far the baseballs fly, only 0.12 COR can dramatically increase the distance the ball will travel — which is well within the variance of 0.514 to 0.578.

The bottom line is this, MLB seems to have made a change to the balls that are well within its rules and it’s led to an increase in dingers; and as everyone knows, chicks dig the long ball*.

*Yes I know, everyone digs the longball. I just wanted an excuse to put this awkward commercial in this post.

[twitter-follow screen_name=’sportswithneil’] [twitter-follow screen_name=’nvr93′]

2 replies »

  1. God…not this “Juiced ball” shit again. I lived through this non-sense 20 years ago. Then, as now, this is all a bunch of crap coming from some poindexters with junk numbers who think they know something about baseball. Also, just like then, this is just somebody’s way of not talking about the obvious.

    1) A Fundamental Change In Hitter’s Approach
    In my day, I was a corner infielder with Jay Buhner-esque type number (low average, but power). Then, every coach and manager drilled it into you that the one thing you couldn’t do was get a lot of strikeouts because that’s the one out that really can’t get you anything. Now, we have guys swinging out of their shoes trying to crush every pitch they see. Then again, this is what happens when racking up 150+ Ks is no longer taboo, and we have things like “exit velocity,” “launch angle,” and the most important number of all…”power = payday.” Strikeouts ain’t in the “slash line.”

    2) The Perfect Storm
    Two other things are happening in baseball right now that really drive this…bad/inconsistent umpires and pitchers who don’t know how to pitch at the major-league level. I can’t tell you how many times in the time frame you mention that I’ve seen pitchers forced into grooving pitches because the only pitch guaranteed to get called a strike is a fastball down the pipe…that is unless Angel Hernandez, CB Bucknor, or Joe West is behind the plate. When pitchers can’t work the corners, hitters get fat.

    You can double-down on that with the fact that baseball has waaaaaay more pitchers who routinely deal at 95+ mph. Trust me, it’s much easier to drive a ball out of the yard when the guy on the mound supplies the power.

    Kyle Schwarber is the walking embodiement of this. Every home run that guy has hit this year has been off a heater down the middle/on the inside half of the plate…every goddamn one. And even then, he misses more often than he connects. If there were such a thing as umps who could consistently breaking pitches for strikes, ham sandwiches like Schwarber would never get out of Double-A.

    Next thing you know, we’ll be talking about new, undetectable PEDs made in Russia…

    • The change in approach is part of it for sure (selling out for power), but it’s pretty well documented that there have been changes to the ball.

      The sports lap at Wazzu showed it and that the balls are routinely flying farther as a result of these changes.