Gavin Williams leads the MLB Postseason strikeout leader market at 63% implied probability, reflecting his elite regular-season K/9 rate of 12.1 and standout early playoff performances, including 12 strikeouts in a 5.2-inning ALDS outing for the Cleveland Guardians. Teammate Parker Messick sits at 18.9% amid Cleveland's rotation depth and potential for additional innings, while Tarik Skubal (17.2%) draws support from his strong October track record and NLCS role with the Dodgers despite a midseason trade. Lower-priced options such as Joey Cantillo, Freddy Peralta, Drew Rasmussen, and Roki Sasaki trade in the 13-17% range on matchup-specific upside and bullpen or spot-start opportunities. The market prices in the Guardians' playoff path and Williams' workload edge as primary drivers, with resolution based solely on cumulative postseason strikeouts through the World Series.