The first half and second-half champions in both the National League East and National League West divisions would meet in best-of-five series, with the winners advancing to the NL Championship Series (NLCS). If the same team won both halves, a wild card team – the second-place team from both halves combined – would qualify for the postseason, but this proved unnecessary in both leagues. There were no plans to continue the format in later seasons, although the Division Series resumed in after MLB realigned to three divisions in each league. The teams in the 1981 NLDS were: