The 2026 MLB postseason stolen-base leader market stays tightly contested because base-stealing opportunities depend heavily on series length, matchups, and in-game situations rather than regular-season totals. Speed threats such as Jarren Duran, Brayan Rocchio, Chandler Simpson, Brice Turang, Pete Crow-Armstrong, Fernando Tatis Jr., José Ramírez, and Jackson Merrill sit in a narrow band of implied probabilities, reflecting uncertainty over which clubs will advance deepest and how often their leadoff or middle-infield types will run. Recent regular-season leaders posted 40-plus steals, yet playoff volume remains low and variable, with late scratches, pitching changes, and extra-inning games able to shift outcomes quickly among this broad group of contenders.