MLB believes that the crackdown should boost offense based on the offensive surge simply in the last two weeks once MLB told owners that a crackdown would soon start.
Hitters are batting a season-high .247 with a .318 on-base percentage and .419 slugging percentage in June compared to .236./.312/.395 the first two months.
The spin rate by pitchers last week was the lowest of the season. There have been several noticeable decreases in spin-rates in recent weeks involving starts from Trevor Bauer and Kenley Jansen of the Los Angeles Dodgers to Gerrit Cole of the New York Yankees to closer Josh Hader of the Milwaukee Brewers.