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By all accounts, Ted Williams just had freakish hand eye coordination. That's what allowed him to go back and forth from MLB star to ace pilot. I mean, he flew planes with propellers in WWII, played baseball for eight years, was recalled for duty in Korea, took an eight week refresher course and was flying a jet in combat.
Fun fact - Williams is also in the sport fishing hall of fame. His fly casting is said to have been something to behold.
To be among the very best at three distinctly different careers - baseball, Marine pilot and sport fishing? It's just not normal.