The Opsera is a statistic RealGM's Chris Reina created in order to objectively rank teams by how well they hit (OPS) and pitch (ERA). In order to determine a team's Opsera, we 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. Below are the final rankings through Thursday, April 28th's games: 1. St. Louis Cardinals - 4.92 The Cardinals wouldn't be ranked first without the contributions of Lance Berkman, who signed a criticized $8,000,000 contract this past winter. He's hitting .410 with eight home runs, a .467 OBP and 1.263 OPS in 83 at-bats in 2011. 2. New York Yankees - 4.48 While Alex Rodriguez carries the offense, plug-in starters Freddy Garcia (0.69 ERA in 13 innings) and Bartolo Colon (2.77 ERA in 26 innings) have kept the Yankees afloat. 3. Cleveland Indians - 4.31 Grady Sizemore has answered his critics with a .432 OBP and four home runs in the 10 games since his return from microfracture knee surgery. 4. Los Angeles Angels - 4.25 The season is only about a month old, but the American League Cy Young award appears to be Jered Weaver's to lose. The right-hander is 6-0 with a 0.99 ERA and 49 strikeouts in 45 2/3 innings this season. He also already has two complete games and a shutout. 5. Florida Marlins - 4.11 Florida is benefiting from the early contributions of Chris Coghlan, who has four home runs and 16 RBI with a .350 OBP. The center fielder is hitting .348 in the last seven days. 6. Texas Rangers - 3.94 While the Red Sox have been up-and-down offensively, the Rangers have remained hot without the injured Josh Hamilton because of Adrian Beltre. He had seven home runs and 21 RBI in 25 games and his average (.263) has increased over the last week. --Milwaukee Brewers - 3.94 The Brewers have the second-highest batting average (.279) in the majors, thanks in part of Ryan Braun's blistering start. The left fielder is hitting .356 with nine home runs and gets on base 45.4% of the time he comes to the plate. 8. Oakland Athletics - 3.83 They rank in the bottom third of most hitting categories, but they led all of baseball in ERA (2.66) and among the top 10 in most pitching statistics. 9. Philadelphia Phillies - 3.80 Not surprisingly, the Phillies have been carried by their pitching in the month of April. They ranked third in quality starts (17) and first in WHIP (1.15). Meanwhile, their offense clearly misses Chase Utley (injury) and Jayson Werth (Nationals). 10. Atlanta Braves - 3.63 As with the Athletics and Phillies, the Braves rank this high because of their pitching. Atlanta's .297 OBP ranks 27th in all of baseball, but they rank in the top five in terms of WHIP, ERA and Quality Starts. 11. Tampa Bay Rays - 3.60 12. Toronto Blue Jays - 3.58 13. Colorado Rockies - 3.55 14. Cincinnati Reds - 3.32 15. San Francisco Giants - 3.15 16. San Diego Padres - 2.93 17. Washington Nationals - 2.82 18. New York Mets - 2.80 19. Boston Red Sox - 2.72 20. Arizona Diamondbacks - 2.69 21. Pittsburgh Pirates - 2.68 22. Kansas City Royals - 2.65 23. Los Angeles Dodgers - 2.64 24. Seattle Mariners - 2.48 25. Detroit Tigers - 2.31 26. Chicago White Sox - 2.23 27. Chicago Cubs - 2.07 28. Baltimore Orioles - 2.05 29. Houston Astros - 2.03 30. Minnesota Twins - 1.19