Hernandez credits his father, who played ball with Stan Musial when they were both in the Navy during World War II, for helping him out of a batting slump in 1985. His father would observe his at-bats on TV and note that when Keith was hitting well, he could see both the "1" and the "7" on his uniform on his back as he began to stride into the pitch. Not seeing both numbers meant Keith was bailing out on inside pitches, trying too hard to pull the ball, and vulnerable to outside fastballs or outside breaking pitches.