Charlie Blackmon and the Good Side
Take a look at Charlie Blackmon’s defensive charts and you’ll notice that he has a good side, one where he’s made a higher percentage of catches than the other. On the one hand, that seems strange: humans are largely symmetrical creatures. On the other, maybe it makes perfect sense: most people have dominant hands and eyes and move better in certain directions.
Nowhere is the latter point more painfully clear to me, personally, than on the basketball court. As much as I practice going to my left, I usually do something very silly when I attempt the feat in a game. If I get to the left and actually get to the hoop, my mechanics fall apart when I get there, and I end up doing a strange thing with my right hand that leads to cuss words more often than points.
So when I saw this map for Blackmon, I figured it was all about that first step. See those hits over his left shoulder that are colored blue? Those are relatively high-percentage catches that have fallen into play against him. Must not be stepping well in that direction, I figured.

But when I asked the outfielder about those hits and his first step, he laughed. First, he thanked me for highlighting his shortcomings. Then he said something surprising — “I prefer the ball to my left,” he said. “There’s something I don’t like about running towards a ball to my right.”