In the 2026 MLB postseason, extra-inning games extend under traditional rules without the automatic runner used in the regular season, raising the potential for marathons when offenses stall against strong bullpens. The ongoing ALDS between the Guardians and White Sox heads to a decisive Game 5 on October 10, following a series with multiple one-run outcomes that could stretch if late-inning relievers hold firm. Upcoming NLCS matchups pitting the Dodgers against the Brewers, along with ALCS contests involving the Rays, feature deep rotations and rested arms due to off days, often leading to low-scoring affairs that test endurance. Historical postseason marathons reaching 15-plus innings underscore how evenly matched pitching staffs and home/road dynamics frequently prolong games into extra frames.