In MLB postseason play, game length is driven mainly by extra innings in tightly contested matchups, where strong starting rotations, deep bullpens, and managerial caution in high-leverage spots keep scores close after nine frames. The current playoff structure, featuring wild card rounds and best-of series, creates multiple opportunities for marathon contests, especially in October when teams prioritize advancement over pitch counts. Outdoor venues can add weather-related delays, while the pitch clock and other pace rules exert limited influence once extra innings begin. With the 2026 regular season concluding and the postseason opening in early October, recent team form, injury reports, and divisional standings will shape which series produce the longest games. No significant rule or format shifts have occurred in the past month to alter these dynamics.