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, September 1.

Rankings from last week are in parenthesizes.

1. (1) Washington Nationals – 4.01

The Nationals have a seven-game lead in the National League East as the possibility of a Beltway World Series looms.

2. (2) Oakland Athletics – 3.89

Oakland crumbled against Los Angeles over the weekend, casting doubt over their championship hopes. If they don't regroup quickly, the playoffs may go on without them.

3. (4) Los Angeles Dodgers – 3.88

Clayton Kershaw's 1.73 ERA is more than a half-run better than the next-best in the National League (Johnny Cueto, 2.26).

4. (5) Los Angeles Angels – 3.79

The Angels are hot at the right time and Mike Trout's career-best power numbers are to thank. The 23-year-old has 31 home runs and 97 RBIs with a month to play.

5. (6) Baltimore Orioles – 3.74

The Orioles aren't leading the American League East simply because the competition has been weak. They'd have the NL's best record.

6. (3) Seattle Mariners – 3.72

7. (13) San Francisco Giants – 3.62

8. (T9) Pittsburgh Pirates – 3.60

9. (12) Detroit Tigers – 3.55

10. (T9) Atlanta Braves – 3.54

11. (T9) Cleveland Indians – 3.50

12. (7) Milwaukee Brewers – 3.45

13. (8) Tampa Bay Rays – 3.44

14. (14) Kansas City Royals – 3.36

15. (15) St. Louis Cardinals – 3.32

16. (16) Toronto Blue Jays – 3.27

T17. (T17) Cincinnati Reds – 3.17

-- (T17) San Diego Padres – 3.17

19. (19) Miami Marlins – 3.16

20. (22) New York Yankees – 3.13

21. (20) Chicago Cubs – 3.11

22. (21) New York Mets – 3.02

23. (26) Philadelphia Phillies – 2.89

24. (23) Boston Red Sox – 2.86

25. (25) Chicago White Sox – 2.78

26. (24) Colorado Rockies – 2.76

27. (27) Arizona Diamondbacks – 2.68

28. (29) Houston Astros – 2.63

29. (28) Minnesota Twins – 2.55

30. (30) Texas Rangers – 2.19

 

Follow @RealGMBaseball on Twitter and 'Like Us' on Facebook!