The share of a hitter's batted balls hit in the air to their pull side — the most home-run-friendly contact a hitter can make.
Most home runs are pulled and in the air. Pull-air rate isolates that specific, high-value contact: balls a hitter both elevates and pulls, where fences are typically closest and the hitter's power plays up.
A hitter can post strong exit velocity yet hit too many balls the other way or on the ground to convert it into home runs. Pull-air rate captures whether the batted-ball direction matches the power.
Pull-air rate is a strong home-run-props signal, especially in parks with a short porch on the hitter's pull side, and feeds the pull-profile view on player pages.
Pulled, elevated contact is where fences are closest and a hitter's power is greatest, so it converts to home runs far more often than opposite-field or ground-ball contact at the same exit velocity.