MLB Wild Card Series X-factors: Royals, Brewers have game-changing speed, Padres with upper hand vs. Braves
Before each round, we like to identify one plausible X-factor from each series that could swing the outcome. What is an "X-factor"? Why, dear reader, it's a conveniently vague term that allows us to write about darn near any angle that we want to without having to provide additional justification.