Batting average against

In baseball statistics, batting average against (denoted by BAA or AVG), also known as opponents' batting average (denoted by OBA),[lower-alpha 1] 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.

Sandy Koufax had a .179 batting average against in 1965, the best in Major League Baseball for that season.[1]

Definition

Batting average against is calculated as:[2]

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][lower-alpha 2]

For example, in 2021, Max Scherzer had the best (lowest) batting average against in Major League Baseball among qualified pitchers.[3][lower-alpha 3] Scherzer's BAA for the 2021 season was:[3]

See also

Notes

  1. Not to be confused with on-base average (OBA), more commonly known as on-base percentage (OBP).
  2. See section "Player Batting Against", hover over "BA" column header.
  3. See section "Player Batting Against", sort by column "BA".

References


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