The 2026 MLB postseason stolen bases leader market stays tightly bunched, with no outcome above 16.5% implied probability, because the short playoff format amplifies variance and limits opportunities for any single speedster to pull away. Contenders like Taylor Walls, Jazz Chisholm Jr., Cedric Mullins, Michael Harris II, Chandler Simpson, and Jackson Chourio feature on teams still active or with deep runs ahead, where aggressive base-running, matchup advantages, and extra-inning games can quickly shift totals. Regular-season leaders such as Nasim Nuñez sit lower as their clubs exited early, while head-to-head history, rest advantages, and late-series lineup tweaks add further unpredictability to the final count.