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 Monday, August 12th.

Rankings from last week are in parenthesizes.

1. (1) Detroit Tigers – 4.31

Miguel Cabrera has four HRs in his last four games and is just six back of Chris Davis in the race for a second-straight Triple Crown.

2. (4) Atlanta Braves – 4.17

The Braves have a 14-game lead in the NL East. Engage cruise control.

T3. (3) Boston Red Sox – 3.95

Boston has the fourth-highest run differential in baseball, but Tampa Bay is still fast approaching.

-- (8) Los Angeles Dodgers – 3.95

In mid-June, they ranked 20th on this list.

5. (2) St. Louis Cardinals – 3.92

The Pirates dominated them last week, but the Cardinals are just three games back in the NL Central.

6. (T5) Pittsburgh Pirates – 3.88

7. (T5) Cincinnati Reds – 3.78

8. (10) Texas Rangers – 3.77

9. (9) Oakland Athletics – 3.58

10. (7) Tampa Bay Rays – 3.56

11. (T17) Kansas City Royals – 3.44

12. (12) Arizona Diamondbacks – 3.36

13. (14) Baltimore Orioles – 3.28

14. (11) Cleveland Indians – 3.23

15. (15) Washington Nationals – 3.21

16. (19) Milwaukee Brewers – 3.18

17. (13) Colorado Rockies – 3.13

T18. (16) Los Angeles Angels – 3.12

-- (22) New York Mets – 3.12

20. (T17) Chicago Cubs – 3.04

21. (20) Toronto Blue Jays – 2.93

22. (21) New York Yankees – 2.91

23. (24) Chicago White Sox – 2.89

24. (25) San Francisco Giants – 2.88

25. (23) Seattle Mariners – 2.87

26. (26) Philadelphia Phillies – 2.75

27. (28) Minnesota Twins – 2.71

28. (27) San Diego Padres – 2.68

29. (29) Miami Marlins – 2.45

30. (30) Houston Astros – 1.80