Multiple speedy infielders and outfielders from early-round playoff teams keep the 2026 MLB postseason stolen bases leader market tightly bunched, with no single player exceeding roughly 19% implied probability. Sam Antonacci’s rookie speed and White Sox postseason access, Taylor Walls’ consistent base-stealing for the Rays, and similar profiles for Jorge Mateo, Andy Pages, José Ramírez, and Jackson Chourio create a crowded field. Limited games played so far, small-sample variance in leadoff opportunities, and the need for teams to advance deeper all amplify uncertainty. Recent regular-season momentum for high-volume thieves and the aggressive base-running styles common among these contenders sustain the competitive balance reflected in current trader consensus.