Barrel rate is an excellent tool for evaluating the true power-hitting ability of a slugger. But barrel rate does take about 50 batted balls to stabilize and most hitters do not yet have 50 batted ball events.
Even after a hitter’s barrel rate has likely stabilized, however, there are signs that it could improve or decline. One such sign that I use, particularly in the early going, is fly ball exit velocity. If a hitter has a lot of home runs supported by a great barrel rate, but he also exhibits poor fly ball exit velocity, there might be imminent regression to both his barrel and home run rates. Conversely, if a hitter isn’t hitting many home runs and has a poor barrel rate, but he hits his fly balls really hard, he might be getting unlucky.
To provide some context to early-season barrel rates, I’ve identified a few examples of both types of guys.
Please, blog, may I have some more?