In Major League Baseball’s current postseason format, home-field advantage in the World Series goes to the pennant winner with the better regular-season record, regardless of that team’s postseason seeding within its own league. The home team hosts Games 1 and 2, and Games 6 and 7 if the best-of-seven series goes that far.
If the two World Series teams finished the regular season with identical records, MLB applies its mathematical tiebreakers: head-to-head record first, then intradivision record, then interdivision record.
That record-based rule is different from earlier rounds, where home-field advantage follows postseason seeding. A Wild Card team can still host World Series games if it finished with the stronger regular-season record than the other league’s champion.
Source: MLB.com, “How MLB playoffs work: How many teams, format and more”.
Image: U.S. Navy sailors playing baseball; U.S. Navy photo, public domain, via Wikimedia Commons.