The month of May has belonged to Bryce Harper and Prince Fielder, the young Cubs are fulfilling promise and why the Yankees are in trouble without Jacoby Ellsbury.
The Nationals have broken into the top five, while the Yankees (nine spots), Mets (six), Angels (seven) and Reds (five) took the biggest falls.
The Royals have avoided a hangover following their surprise World Series appearance. They rank among baseball's best in both hitting and pitching.
With more than a month of games played we are starting to see some stability in the OPSERA rankings. The top five clubs have shuffled a bit, but remain constant.
The Dodgers, Cardinals, Royals, Astros and Yankees comprise the top five in this week's rankings. One of those teams is not like the other.