| 2012 NL Leaders | |||||||||||||
| Name | Age | Team | G | IP | TBF | BB% | K% | BABIP | LOB% | GB% | HR/Air | ERA | FIP |
| Joseph Paterson | Arizona | 6 | 2.67 | 26 | 11.5% | 0.0% | .619 | 46% | 57% | 20% | 37.08 | 16.24 | |
| John Ely | LA Dodgers | 2 | 2.67 | 19 | 21.1% | 15.8% | .750 | 45% | 55% | 0% | 20.22 | 6.50 | |
| Francisco Cordero | 37 | Houston | 6 | 5.00 | 32 | 12.5% | 15.6% | .579 | 46% | 41% | 16% | 19.80 | 9.33 |
| Rick Vanden Hurk | Pittsburgh | 4 | 2.67 | 16 | 6.3% | 18.8% | .455 | 43% | 55% | 0% | 13.48 | 3.13 | |
| Christopher Schwinden | 26 | NY Mets | 3 | 8.67 | 46 | 6.5% | 2.2% | .297 | 40% | 50% | 19% | 12.46 | 9.93 |
| Edwar Cabrera | 25 | Colorado | 2 | 5.67 | 33 | 21.2% | 15.2% | .353 | 59% | 43% | 26% | 11.11 | 11.95 |
| Todd Redmond | 27 | Cincinnati | 1 | 3.33 | 22 | 22.7% | 9.1% | .429 | 75% | 33% | 10% | 10.81 | 10.33 |
| Pedro Beato | 26 | NY Mets | 7 | 4.33 | 20 | 10.0% | 25.0% | .333 | 36% | 29% | 11% | 10.39 | 5.21 |
| J.C. Romero | 36 | St. Louis | 11 | 8.00 | 41 | 4.9% | 12.2% | .367 | 62% | 50% | 18% | 10.13 | 7.88 |
| Ryan Perry | Washington | 7 | 8.00 | 35 | 5.7% | 8.6% | .357 | 45% | 37% | 11% | 10.13 | 6.38 | |
| Vinnie Chulk | 34 | Milwaukee | 7 | 9.00 | 48 | 8.3% | 20.8% | .515 | 52% | 26% | 0% | 10.00 | 2.24 |
| Brian Sanches | 34 | Philadelphia | 6 | 6.33 | 34 | 8.8% | 14.7% | .381 | 85% | 28% | 22% | 9.95 | 11.18 |
| Brad Lidge | 36 | Washington | 11 | 9.33 | 51 | 21.6% | 19.6% | .478 | 60% | 48% | 8% | 9.65 | 5.91 |
| Jonathan Sanchez | 30 | Colorado | 3 | 11.33 | 57 | 15.8% | 15.8% | .424 | 60% | 34% | 12% | 9.53 | 7.36 |
| Jorge De La Rosa | 31 | Colorado | 3 | 10.67 | 53 | 3.8% | 11.3% | .308 | 42% | 34% | 17% | 9.28 | 8.66 |
| Travis Blackley | 30 | San Francisco | 4 | 5.00 | 25 | 8.0% | 8.0% | .350 | 33% | 43% | 0% | 9.00 | 3.53 |
| Jonathan Albaladejo | 30 | Arizona | 3 | 3.00 | 15 | 0.0% | 13.3% | .400 | 65% | 25% | 11% | 9.00 | 7.13 |
| Brian Wilson | 30 | San Francisco | 2 | 2.00 | 12 | 16.7% | 16.7% | .500 | 67% | 29% | 0% | 9.00 | 4.13 |
| Matt Palmer | 33 | San Diego | 3 | 2.00 | 10 | 20.0% | 20.0% | .250 | 77% | 33% | 25% | 9.00 | 10.63 |
| Enerio Del Rosario | 27 | Houston | 19 | 19.00 | 97 | 7.2% | 11.3% | .446 | 53% | 39% | 2% | 9.00 | 4.07 |
| Dustin Moseley | 31 | San Diego | 1 | 5.00 | 22 | 9.1% | 18.2% | .286 | 36% | 53% | 13% | 9.00 | 5.33 |
| Brian Fuentes | 37 | St. Louis | 6 | 5.00 | 26 | 19.2% | 23.1% | .385 | 62% | 40% | 11% | 9.00 | 6.33 |
| Hisanori Takahashi | Pittsburgh | 9 | 8.33 | 39 | 10.3% | 28.2% | .381 | 54% | 46% | 15% | 8.64 | 5.05 | |
| Kerry Wood | 35 | Chi Cubs | 10 | 8.67 | 42 | 26.2% | 14.3% | .304 | 62% | 42% | 7% | 8.30 | 7.05 |
| Joshua Outman | 28 | Colorado | 27 | 40.67 | 185 | 10.8% | 21.6% | .348 | 52% | 48% | 11% | 8.19 | 4.87 |
| William Harris | 28 | Colorado | 20 | 17.67 | 89 | 6.7% | 21.3% | .429 | 54% | 32% | 7% | 8.15 | 4.37 |
| Brooks Raley | Chi Cubs | 5 | 24.33 | 116 | 9.5% | 13.8% | .321 | 61% | 43% | 14% | 8.14 | 6.91 | |
| Esmil Rogers | 27 | Colorado | 23 | 25.67 | 131 | 13.7% | 22.1% | .436 | 62% | 49% | 5% | 8.06 | 4.22 |
| Mike MacDougal | 35 | LA Dodgers | 7 | 5.67 | 32 | 18.8% | 12.5% | .409 | 67% | 37% | 0% | 7.94 | 4.89 |
| Lendy Castillo | 23 | Chi Cubs | 13 | 16.00 | 88 | 13.6% | 14.8% | .400 | 64% | 36% | 5% | 7.88 | 5.94 |
