Batting average against

In baseball statistics, batting average against (denoted by BAA or AVG), also known as opponents' batting average (denoted by OBA),[a] is a statistic that measures a pitcher's ability to prevent hits during official at bats.

It can alternatively be described as the league's hitters' combined batting average against the pitcher.

for which: For example, if a pitcher faced 125 batters and allowed 25 hits, issued 8 walks, hit 1 batsman, allowed 2 sacrifice hits, allowed 3 sacrifice flies, and had 1 instance of catcher's interference, the pitcher's BAA would be calculated as:

Reference site Baseball-Reference.com more simply defines BAA as hits divided by at bats, as "at bats" for a pitcher equates to the above noted denominator (batters faced less walks, hit by pitch, sacrifice hits, sacrifice flies, and catcher's interference):[3][b]

For example, in 2021, Max Scherzer had the best (lowest) batting average against in Major League Baseball among qualified pitchers.

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