It means Batting Average Against. It is used to show what opposing hitters are hitting off of a particular pitcher. For example, Randy Johnson had a .197 BAA in the 2004 season. That means opposing hitters had a .197 batting average against him that season.
Bill Johnson - pitcher - was born in 1960.
Randy Johnson
yes bobby Johnson was a pitcher for the New York giants
Walter Johnson pitched an 18 inning shutout over the Chicago White Sox on May 15, 1918. Lefty Williams was the opposing pitcher, who also went the full 18 innings, and the score was 1-0.
Ernie Johnson - pitcher - was born on 1924-06-16.
Ernie Johnson - pitcher - died on 2011-08-12.
If a pitcher comes in with the lead and does not surrender the lead to the opposing team, he earns a hold.
Jim Johnson - left-handed pitcher - died on 1987-12-06.
Jim Johnson - left-handed pitcher - was born on 1945-11-03.
Walter Johnson
Don Larsen threw the only no hitter AND perfect game in World Series history in Game 5 of the 1956 World Series against the Brooklyn Dodgers. The Dodgers starting pitcher that day was Sal Maglie.