White Sox catcher A.J. Pierzynski is said to use Nintendo's Sight Training to help his baseball.
According to Sun Times, Pierzynski spends time in the locker room flicking his wrists with the DS, using Sight Training to help his vision.
Pierzynski has been working with a vision-training game on his handheld device with the hope of improving his ability to pick up the baseball. So far, the reviews are good: two home runs, a .529 batting average and a team-high seven RBI through four games.
Thanks to C3's Jacob4000 for the tip.