| 2012 NL Leaders | |||||||||||||
| Name | Age | Team | G | IP | TBF | BB% | K% | BABIP | LOB% | GB% | HR/Air | ERA | FIP |
| Charles Fick | St. Louis | 2 | 1.67 | 9 | 11.1% | 0.0% | .429 | 75% | 0% | 0% | 5.39 | 4.92 | |
| Justin Wilson | 25 | Pittsburgh | 8 | 4.67 | 26 | 11.5% | 26.9% | .667 | 92% | 19% | 0% | 1.93 | 2.06 |
| Michael Stutes | 26 | Philadelphia | 6 | 5.67 | 29 | 13.8% | 17.2% | .350 | 45% | 20% | 0% | 6.35 | 3.48 |
| Aneury Rodriguez | 25 | Houston | 1 | 6.00 | 22 | 9.1% | 27.3% | .0 | 167% | 21% | 18% | 3.00 | 6.46 |
| J.J. Hoover | Cincinnati | 28 | 30.67 | 123 | 10.6% | 25.2% | .203 | 85% | 22% | 3% | 2.05 | 3.23 | |
| Scott Maine | Chi Cubs | 21 | 20.67 | 94 | 12.8% | 27.7% | .326 | 73% | 23% | 5% | 4.79 | 4.19 | |
| Julio Teheran | 22 | Atlanta | 2 | 6.33 | 24 | 4.2% | 20.8% | .278 | 33% | 24% | 0% | 5.69 | 2.02 |
| Chris Young | 33 | NY Mets | 20 | 115.00 | 493 | 7.3% | 16.2% | .301 | 74% | 24% | 6% | 4.15 | 4.54 |
| Raul Valdes | Philadelphia | 27 | 31.00 | 113 | 4.4% | 31.0% | .221 | 69% | 25% | 6% | 2.90 | 2.61 | |
| Jonathan Albaladejo | 30 | Arizona | 3 | 3.00 | 15 | 0.0% | 13.3% | .400 | 65% | 25% | 11% | 9.00 | 7.13 |
| Vinnie Chulk | 34 | Milwaukee | 7 | 9.00 | 48 | 8.3% | 20.8% | .515 | 52% | 26% | 0% | 10.00 | 2.24 |
| Rodrigo Lopez | 37 | Chi Cubs | 4 | 6.33 | 34 | 14.7% | 5.9% | .320 | 57% | 27% | 0% | 5.69 | 5.34 |
| Christian Garcia | 27 | Washington | 13 | 12.67 | 48 | 4.2% | 31.3% | .231 | 98% | 28% | 10% | 2.13 | 3.76 |
| Antonio Bastardo | 27 | Philadelphia | 65 | 52.00 | 224 | 11.6% | 36.2% | .324 | 72% | 28% | 9% | 4.33 | 3.38 |
| Brian Sanches | 34 | Philadelphia | 6 | 6.33 | 34 | 8.8% | 14.7% | .381 | 85% | 28% | 22% | 9.95 | 11.18 |
| Pedro Beato | 26 | NY Mets | 7 | 4.33 | 20 | 10.0% | 25.0% | .333 | 36% | 29% | 11% | 10.39 | 5.21 |
| Brian Wilson | 30 | San Francisco | 2 | 2.00 | 12 | 16.7% | 16.7% | .500 | 67% | 29% | 0% | 9.00 | 4.13 |
| Tyler Clippard | 27 | Washington | 74 | 72.67 | 307 | 9.4% | 27.4% | .273 | 71% | 30% | 5% | 3.72 | 3.35 |
| Ernesto Frieri | 27 | San Diego | 11 | 11.67 | 50 | 8.0% | 36.0% | .292 | 82% | 30% | 11% | 2.31 | 3.81 |
| Bill Bray | 29 | Cincinnati | 14 | 8.67 | 43 | 32.6% | 16.3% | .222 | 87% | 30% | 13% | 5.19 | 9.36 |
| Jason Grilli | 36 | Pittsburgh | 64 | 58.67 | 244 | 9.0% | 36.9% | .328 | 83% | 30% | 8% | 2.91 | 2.84 |
| Joshua Lindblom | 25 | Philadelphia | 26 | 23.33 | 107 | 15.9% | 25.2% | .268 | 70% | 30% | 10% | 4.63 | 5.36 |
| Michael Schwimer | Philadelphia | 35 | 34.33 | 147 | 10.9% | 24.5% | .329 | 68% | 30% | 5% | 4.46 | 3.74 | |
| Miguel Socolovich R. | 26 | Chi Cubs | 6 | 6.00 | 25 | 12.0% | 24.0% | .200 | 71% | 31% | 9% | 4.50 | 4.79 |
| David Hernandez | 27 | Arizona | 72 | 68.33 | 278 | 7.9% | 35.3% | .295 | 77% | 31% | 4% | 2.37 | 2.12 |
| Tim Byrdak | 39 | NY Mets | 56 | 30.67 | 125 | 14.4% | 27.2% | .271 | 61% | 32% | 4% | 4.40 | 3.62 |
| Maikel Cleto | 23 | St. Louis | 9 | 9.00 | 41 | 4.9% | 36.6% | .474 | 87% | 32% | 26% | 7.00 | 6.57 |
| William Harris | 28 | Colorado | 20 | 17.67 | 89 | 6.7% | 21.3% | .429 | 54% | 32% | 7% | 8.15 | 4.37 |
| Ross Ohlendorf | 30 | San Diego | 13 | 48.67 | 233 | 10.3% | 16.7% | .342 | 55% | 32% | 6% | 7.58 | 4.94 |
| Evan Meek | 29 | Pittsburgh | 12 | 12.00 | 57 | 10.5% | 14.0% | .325 | 61% | 33% | 4% | 6.75 | 4.63 |
