The Opsera is a statistic RealGM Executive Editor Christopher 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 final rankings through the Thursday, July 7th games: The rankings from last week are in parenthesizes 1. (1) New York Yankees -- 4.36 The Yankees have lost three of four since Derek Jeter returned from his calf injury. It has much more to do with the attention surrounding his chase for 3,000 than anything else. The captain is 4-for-18 with a walk and two strikeouts since his July 4th return. 2. (2) Boston Red Sox -- 4.07 They have won seven of eight and regained first place in the American League East on Thursday night. Their rotation is in shambles, but Terry Francona and Co. have found a way to solider on. 3. (4) Atlanta Braves -- 3.97 Jair Jurrjens is my early favorite for the National League Cy Young award. 4. (3) Philadelphia Phillies -- 3.96 5. (7) Texas Rangers -- 3.79 The Rangers, winners of four straight, have a narrow lead over the Angels in the AL West and are entering the All-Star break with momentum. 6. (5) Los Angeles Angels -- 3.74 7. (6) St. Louis Cardinals -- 3.58 8. (8) Tampa Bay Rays -- 3.56 9. (10) San Francisco Giants -- 3.49 10. (9) Milwaukee Brewers -- 3.32 11. (11) Arizona Diamondbacks -- 3.32 12. (T12) Cleveland Indians -- 3.31 13. (21) Pittsburgh Pirates -- 3.30 The Pirates made the biggest jump this week. They are the only team in baseball with an even run differential and have won six of their last 10 games. Pittsburgh trails Milwaukee by just a game in the NL Central. 14. (T12) Oakland Athletics -- 3.28 15. (19) New York Mets -- 3.24 Believe it or not, the Mets have won four of five without Jose Reyes, who is on the disabled list with a hamstring strain. Not surprisingly, New York has won on the strength of their pitching. 16. (T15) Chicago White Sox -- 3.20 17. (T15) Cincinnati Reds -- 3.19 18. (T17) Toronto Blue Jays -- 3.18 The Blue Jays have a team OPS of .737. All-Star Jose Bautista has an OPS of 1.158, while only two only regular players have a total above .720 this season. 19. (20) Washington Nationals -- 3.18 20. (T17) Detroit Tigers -- 3.15 21. (14) Colorado Rockies -- 3.11 Having lost five consecutive games, Colorado dropped seven spots, the biggest slide this week. They have scored just eight runs in their last four games. 22. (22) San Diego Padres -- 3.11 23. (23) Seattle Mariners -- 3.10 24. (24) Florida Marlins -- 2.90 25. (25) Los Angeles Dodgers -- 2.88 26. (27) Kansas City Royals -- 2.69 27. (28) Chicago Cubs -- 2.62 28. (26) Baltimore Orioles -- 2.58 29. (29) Houston Astros -- 2.31 30. (30) Minnesota Twins -- 2.30