By Christopher Reina The Opsera is a statistic I created in order to objectively rank teams by how well they hit (OPS) and pitch (ERA). In order to determine a team's Opsera, I take their OPS, multiply that number by 10 to move the decimal point over one place to the right and then subtract the team's ERA from that number. After a two-week stint on top, the Cardinals have fallen to the second slot behind the Yankees, who also led after Week 2. The Phillies (Week 1), Yankees (Week 2) and Giants (Week 3) have been our other leaders this season.
1. New York Yankees: 4.72
2. St. Louis Cardinals: 4.60
3. Tampa Bay Rays: 4.51
4. San Francisco Giants: 4.46
5. Philadelphia Phillies: 4.31
6. San Diego Padres: 4.09
7. Minnesota Twins: 4.05
8. Colorado Rockies: 3.73
9. Toronto Blue Jays: 3.46
10. Detroit Tigers: 3.39
11. Chicago Cubs: 3.26
12. Los Angeles Dodgers: 3.23
13. Boston Red Sox: 3.21
14. Texas Rangers: 3.21
15. Florida Marlins: 3.20
16. New York Mets: 3.19
17. Washington Nationals: 3.07
18. Seattle Mariners: 2.90
19. Atlanta Braves: 2.86
20. Milwaukee Brewers: 2.77
21. Cleveland Indians: 2.73
22. Cincinnati Reds: 2.65
23. Oakland Athletics: 2.65
24. Baltimore Orioles: 2.47
25. Chicago White Sox: 2.37
26. Los Angeles Angels: 2.34
27. Kansas City Royals: 2.33
28. Arizona Diamondbacks: 2.24
29. Houston Astros: 1.85
30. Pittsburgh Pirates: 1.00

Chris Reina is the executive editor of RealGM. Follow him on Twitter at http://twitter.com/cr_reina.