Interesting that it didn't distinguish that the offending umpires were white, simply that it happened whenever the pitcher and umpire were the same race. How many black umpires are there in MLB?
I'd also argue that if you're looking for discrimination, even on a subconscious level, you'd need to look at the matchups: if there is discrimination, you'd expect to see a white umpire call the most strikes when it's a white pitcher against a black batter; a moderate amount of strikes when it's a white pitcher against a white batter, or a black pitcher against a black batter; and the least amount of strikes when a black pitcher goes against a white batter.
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