The more I look into it, the more it looks like a mechanics issue. First, there are more right-handed batters. Second, it makes throwing to 3rd easier. And, finally receiving the catch from an outfielder or cutoff player is easier to make the a tag on an incoming runner. This is most likely why there have not been any lefthanded catchers since Benny Distefano, who caught 3 games for the Pittsburgh Pirates in 1989.
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