The 2007 season set a new record in the trend toward MLB's form of parity (certain teams can buy a winning record but not run away with things).

This is only the 2nd time in MLB history that no team has finished with a record better than .600 or less than .400.  The only previous year was 2000 (Giants, .599; Cubs, Phillies .401).  And in 2007, the spread was narrower by 12 pp.

Indians, Red Sox  .593
Tampa Bay .407

In both 2000 and 2007, there was symmetry in that the best and worst records were exactly the reverse of each other.

Here is link1 and link2