The MLB playoff series consist of:
- Wild Card Series: Best-of-three games. Higher seed hosts all games.
- Division Series: Best-of-five games. The higher seed hosts Games 1, 2, and 5 (if necessary), the lower seed hosts Games 3 and 4 (if necessary).
- Championship Series (ALCS/NLCS): Best-of-seven games. The higher seed hosts Games 1, 2, 6, and 7 (if necessary), the lower seed hosts Games 3, 4, and 5 (if necessary).
- World Series: Best-of-seven games, with the same home game format as the Championship Series.
So, the series lengths are 3 games for Wild Card, 5 games for Division Series, and 7 games for both Championship Series and the World Series.
