The Opsera is a statistic RealGM Executive Editor Chris Reina created in order to objectively rank teams by how well they hit (OPS) and pitch (ERA). In order to determine the Opsera rating for each, we take their OPS, multiply that number by 10 to move the decimal point over one place to the right and then subtract their ERA from that number. Below are the rankings through the Sunday, May 13th games: The rankings from last week are in parenthesizes. 1. (2) Texas Rangers - 5.08 2. (1) St. Louis Cardinals - 4.80 3. (5) Los Angeles Dodgers - 4.26 4. (6) Washington Nationals - 4.16 5. (3) Baltimore Orioles - 4.12 6. (8) New York Yankees - 4.02 7. (7) Tampa Bay Rays - 3.64 8. (4) San Francisco Giants - 3.59 T9. (14) Cincinnati Reds - 3.48 -- (16) Miami Marlins - 3.48 11. (9) Toronto Blue Jays - 3.35 12. (15) Atlanta Braves - 3.33 13. (13) Philadelphia Phillies - 3.23 14. (10) Chicago White Sox - 3.19 15. (11) Houston Astros - 3.18 16. (21) Pittsburgh Pirates - 3.04 17. (T19) San Diego Padres - 2.98 18. (25) New York Mets - 2.97 19. (26) Boston Red Sox - 2.95 T20. (22) Detroit Tigers - 2.90 -- (29) Chicago Cubs - 2.90 22. (23). Oakland Athletics - 2.87 23. (12) Arizona Diamondbacks - 2.84 T24. (T19) Los Angeles Angels - 2.79 -- (27) Seattle Mariners - 2.79 26. (18) Cleveland Indians - 2.72 27. (24) Kansas City Royals - 2.66 28. (28) Milwaukee Brewers - 2.50 29. (17) Colorado Rockies - 2.38 30. (30) Minnesota Twins - 1.38