The 2026 MLB postseason field was finalized on the final day of the regular season, with the Philadelphia Phillies clinching the last NL wild-card berth via a Game 162 victory and the Houston Astros securing the AL West division title despite finishing at .500. Late-September momentum shifts, including the Phillies' recovery from a four-game slide and the Astros' tiebreaker advantage over the Rangers, shaped the final outcomes. Division winners like the Tampa Bay Rays, Milwaukee Brewers, and Cleveland Guardians earned byes, while wild-card teams such as the New York Yankees, Boston Red Sox, Chicago White Sox, San Diego Padres, and Chicago Cubs locked in spots through consistent performance and favorable results down the stretch. Official standings and head-to-head tiebreakers determined seeding for the upcoming best-of-three wild-card series.