This format was changed in 1998 to a 2–2–1 format. Also changed in 1998 was the seeding in the division series: rather than a rotation deciding seeds 1–3, the division champions are now ranked based on regular-season record. This was needed because there was a 39.5% chance each year that at least one of the leagues would have their top two division champions meet in the Division Series, allowing the worst division champion to have the "advantage" of playing the wild card.