There are three metrics that directly drive a hitter’s home run rate — strikeout rate, HR/FB rate, and FB%. Strikeout rate ties to balls in play, so the more balls in play, the greater the home run rate, all else being equal. The hitter’s HR/FB rate is obvious, as that’s literally telling us what percentage of fly balls have left the yard. Finally, FB% is the percentage of balls hit in the air. While a small percentage of line drives do end up as home runs, the vast majority come from fly balls. We typically think a hitter increased his power by raising his HR/FB rate when we see a home run spike. But as there are actually three metrics driving home run rate, that’s not always the case. So let’s focus on the hitters who have increased their FB% marks the most versus last year. More fly balls equals more opportunities for a home run.
Read the rest of this entry »