This is a preview of the Joe Sheehan Baseball Newsletter, an e-mail newsletter about all things baseball, featuring analysis and opinion about the game on and off the field from the perspective of the informed outsider. Joe Sheehan is a founding member of Baseball Prospectus and a contributor to Sports Illustrated and Baseball America. He has been writing about baseball for more than 20 years.
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" AVG OBP SLG HR% ISO HR/FB
4/6-4/19 .248 .324 .433 4.1% 185 15.3%
4/20-4/26 .253 .328 .434 4.0% 181 15.6%
4/27-5/3 .234 .304 .381 3.1% 147 12.2%
"Is this what a change in the composition of the baseball would look like in the stats? I don’t know. I do know that there’s precedent for things changing on a dime within a season. This “era” started in the middle of 2015, when a league that had been slugging under .400 for 2 1/2 seasons suddenly jumped to .403 in July, .417 in August, and .415 in September."