Study: Inconsistent seams, player behavior behind HR uptick

SAN DIEGO (AP) — Baseballs used during the 2019 regular season had less drag on average, contributing to a power surge that resulted in a record number of home runs, according to a study commissioned by Major League Baseball and released by the league Wednesday.

The report produced by a committee of science professors said inconsistencies in the seams of the baseballs, as well as “changes in player behavior," were chief culprits for the spike in home runs. Batters connected 6,776 times in the regular season, smashing the record of 6,105 set in 2017.

The committee says it did not find evidence that MLB intentionally altered the baseballs and believes the inconsistencies were due to “manufacturing variability.” The balls are hand sewn by workers at Rawlings' factory in Costa Rica.

The 27-page report was written by Alan Nathan, Jim Albert, Peko Hosoi and Lloyd Smith.

A series of recommendations were provided. The scientists say MLB should consider installing humidors at all 30 ballparks “to reduce the variability in storage conditions,” and install atmospheric tracking systems in each stadium. They believe Rawlings should begin tracking dates that baseballs are manufactured and shipped, and they also have suggested a study with a larger sample size to explore the possibility that carry is influenced by the rubbing mud applied to bright, white baseballs before they are used in games.

The group also confirmed suspicions by players and coaches that the “juiced” ball was carrying less during the 2019 postseason. Cardinals manager Mike Shildt said during the NL Championship Series that St. Louis' analytics team believed fly balls were traveling 4 1/2 feet less on average. That backed a study published by data scientist Rob Arthur at Baseball Prospects showing the balls suddenly had less drag.

The scientists...

source https://www.chron.com/sports/article/Study-Inconsistent-seams-player-behavior-behind-14898800.php