Ayn Rand apparently had no special love of baseball. But there was one feature of the game that she singled out for use as a negative metaphor:
"Then you'll scream that money is evil. Evil, because it would not pinch-hit for your self-respect?"
"...no pinch-hitter can live your life..."
The first is uttered by Francisco, who was taught baseball by Dagny and Eddie. The second is uttered by John Galt.
In Atlantis, even the national pastime is different:
When they play baseball in the Valley,
no pinch-hitter ever starts a rally.