Opponent Batting Average measures the batting average of the hitters a pitchers faces, which is calculated by taking the number of hits against and dividing by the total number of opponent at bats.
*Qualifying pitchers only
More about Opponent Batting Average Leaders
Pitching opponent batting average leaders give up the fewer percentage of hits for all batters they face who are credited with an official “at bat”. Those at the top of the leader board will have an opponent batting average of right around .200 or maybe even a little lower (meaning batters get a hit against them approximately 20% of the time, excluding plate appearances that end in a sacrifice, walk, or hits batsman). While the batting average against for those at the very top of the leaderboards has not changed significantly in recent years, overall opponent batting average for pitchers has gone down in the last fifteen to twenty years.