MLB released the results of a scientific study on the potential causes of the home run upswing since the 2015 season, which ultimately determined that there weren’t any changes to the size, weight, seam height, or COR of the baseball that would explain the increase in home runs over the last three seasons.
Furthermore, there was no evidence of a significant alteration in regularly measured ball properties. However, a change in aerodynamic properties of the baseball was discovered, which the committee of 10 scientists determined played a partial role in the rise of home runs.
The group carefully investigated a number of possible factors, including weather conditions and changes in player behavior, while additionally utilizing Statcast data in their research.
In the wake of the results, MLB commissioner Rob Manfred will begin monitoring the temperature and humidity conditions in the ball storage locations of all 30 ballparks.
The possibility of each ballpark implementing the use of humidors has not been ruled out. The Arizona Diamondbacks were the latest team to do so this season, and early numbers show a decline in home runs at Chase Field.
Manfred will also regularly review the production specifications of baseballs in addition to conducting aerodynamic testing. A formation of a scientific advisory council is also in the works.
Moreover, the Commissioner’s Office will begin providing all 30 teams new standards for mud rubbing of the baseball during games. The new guidelines will be imposed by umpires going forward.
Talks of altered baseballs gained steamed during the 2017 World Series, when some pitchers were at odds over potential changes.
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