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. 

All Statistics are through Sunday, May 25th. Last week's rankings are in parenthesis.

1. (1) Los Angeles Dodgers – 4.51
The Dodgers are on top for the fourth week in a row. Despite getting swept by the Giants in San Francisco, their pitching wasn't all that bad. The hitting has dipped, but remained steady at the end of the week.

2. (2) St. Louis – 4.50
The Cardinals still have the top pitching staff in the Major Leagues. They had a 23-scoreless innings streak broken on Saturday.

3. (3) Kansas City – 4.45
The Royals gave up one run in a four-game stretch last week. Mike Moustakas ranks in the top 10 in batting average, Hosmer is in the top 10 of RBIs and Volquez is in the top 10 in ERA.

4. (4) Detroit - 4.02
The Tigers continue to keep pace with the Royals, but slip a little. James McCann hit a walk-off home run last Thursday for his second career home run.

5. (7) Washington – 3.74
The Nationals break into the top 5 with the help of Bryce Harper and Jordan Zimmermann. The starters and the bullpen have helped take  first place in the National League East.

6. (11) Pittsburgh – 3.70
7. (6) Houston – 3.62
8. (10) Tampa Bay – 3.60
9. (8) San Francisco – 3.56
10. (13) Baltimore – 3.30
11. (14) Chicago Cubs – 3.27
12. Oakland – 3.23
13. (4) New York Yankees – 3.18
14. (22) Cleveland – 3.15
15. (9) New York Mets – 3.13
16. (15) Seattle – 3.12
17. (25) Texas – 3.02
18. (17) Arizona – 2.96
19. (23) Toronto – 2.93
20. (21) Atlanta – 2.91
21. (18) Minnesota – 2.86
22. (19) Miami – 2.76
23. (16) Los Angeles Angels – 2.75
24. San Diego – 2.68
25. (20) Cincinnati – 2.54
26. (29) Philadelphia – 2.52
27. (28) Boston – 2.44
28. (27) Colorado – 2.42
29. (26) Chicago White Sox – 2.35
30. (30) Milwaukee – 2.15