The NNL split the season into two halves. St. Louis won the first half, Chicago won the second half. The teams met at the end of the season in a best-of-9 playoff series to determine the Champion.
The 1928 Cleveland Tigers, managed by Frank Duncan and Harry Jeffries and Sam Crawford, missed the postseason after finishing the NNL1 regular season in 7th place with a 20-59 record.