Due to the strike in 1981, the season was split into two halves and playoff seedings were determined using the winners from each half. The first half began on April 9 and ended June 11, while the second half started on August 10 and ended October 4. Overall standings are presented here for reference but were not used to determine playoff berths.
Postseason probabilities are courtesy of Baseball Prospectus and indicate each team's probability of winning the division or wild card, or any postseason berth. Probabilities are based on thousands of Monte Carlo simulations of the remaining season schedule incorporating each team's year-to-date run differential, current roster composition, playing time projections and remaining schedule.