In 1951, when Bobby Thomson homered in the ninth inning to win the National League’s regular season, that single swing—a regular-season swing—was worth about 31 percent in cWPA. It sent the Giants straight to the World Series. In the modern equivalent, it would be a home run that clinched a playoff spot and the Wild Card Series and the Division Series and the League Championship Series all at once. A regular-season swing like that no longer exists.
