| 2012 NL Leaders | |||||||||||||
| Name | Age | Team | G | IP | TBF | BB% | K% | BABIP | LOB% | GB% | HR/Air | ERA | FIP |
| Aneury Rodriguez | 25 | Houston | 1 | 6.00 | 22 | 9.1% | 27.3% | .0 | 167% | 21% | 18% | 3.00 | 6.46 |
| Peter Moylan | 34 | Atlanta | 8 | 5.00 | 21 | 9.5% | 9.5% | .133 | 56% | 50% | 12% | 1.80 | 6.13 |
| Josh Wall | 26 | LA Dodgers | 7 | 5.67 | 21 | 4.8% | 19.0% | .143 | 56% | 40% | 11% | 4.76 | 5.07 |
| Matt Guerrier | 34 | LA Dodgers | 16 | 14.00 | 56 | 12.5% | 16.1% | .152 | 85% | 37% | 13% | 3.86 | 6.34 |
| Huston Street | 29 | San Diego | 40 | 39.00 | 144 | 7.6% | 32.6% | .185 | 79% | 44% | 4% | 1.85 | 2.23 |
| Bryan Morris | 25 | Pittsburgh | 5 | 5.00 | 20 | 10.0% | 30.0% | .200 | 60% | 73% | 0% | 1.80 | 2.53 |
| Steven Rodriguez | LA Dodgers | 11 | 6.67 | 26 | 15.4% | 23.1% | .200 | 86% | 47% | 0% | 1.35 | 3.13 | |
| Miguel Socolovich R. | 26 | Chi Cubs | 6 | 6.00 | 25 | 12.0% | 24.0% | .200 | 71% | 31% | 9% | 4.50 | 4.79 |
| J.J. Hoover | Cincinnati | 28 | 30.67 | 123 | 10.6% | 25.2% | .203 | 85% | 22% | 3% | 2.05 | 3.23 | |
| Brandon Beachey | Atlanta | 13 | 81.00 | 319 | 9.1% | 21.3% | .204 | 78% | 43% | 5% | 2.00 | 3.52 | |
| Doug Slaten | 32 | Pittsburgh | 10 | 13.00 | 55 | 14.5% | 10.9% | .205 | 83% | 50% | 5% | 2.77 | 5.05 |
| Joshua Stinson | 24 | Milwaukee | 6 | 9.33 | 38 | 13.2% | 7.9% | .207 | 104% | 48% | 6% | 0.96 | 5.49 |
| Henry Alberto Rodriguez | 25 | Washington | 35 | 29.33 | 131 | 16.8% | 23.7% | .211 | 60% | 38% | 8% | 5.83 | 5.14 |
| Raul Valdes | Philadelphia | 27 | 31.00 | 113 | 4.4% | 31.0% | .221 | 69% | 25% | 6% | 2.90 | 2.61 | |
| Bill Bray | 29 | Cincinnati | 14 | 8.67 | 43 | 32.6% | 16.3% | .222 | 87% | 30% | 13% | 5.19 | 9.36 |
| Miguel Batista | 41 | Atlanta | 5 | 6.00 | 24 | 8.3% | 8.3% | .222 | 89% | 42% | 9% | 3.00 | 5.63 |
| Justin Hampson | 32 | NY Mets | 13 | 10.00 | 37 | 13.5% | 10.8% | .222 | 64% | 63% | 0% | 1.80 | 3.83 |
| Kenley Jansen | 25 | LA Dodgers | 65 | 65.00 | 252 | 8.7% | 39.3% | .225 | 81% | 34% | 7% | 2.35 | 2.44 |
| Trevor Rosenthal | St. Louis | 19 | 22.67 | 89 | 7.9% | 28.1% | .226 | 78% | 53% | 8% | 2.78 | 3.13 | |
| Joel Hanrahan | 31 | Pittsburgh | 63 | 59.67 | 254 | 14.2% | 26.4% | .230 | 90% | 39% | 9% | 2.71 | 4.48 |
| Christian Garcia | 27 | Washington | 13 | 12.67 | 48 | 4.2% | 31.3% | .231 | 98% | 28% | 10% | 2.13 | 3.76 |
| Ted Lilly | 36 | LA Dodgers | 8 | 48.67 | 202 | 9.4% | 15.3% | .232 | 64% | 43% | 4% | 3.14 | 3.95 |
| Jon Rauch | 34 | NY Mets | 73 | 57.67 | 233 | 5.2% | 18.0% | .232 | 62% | 38% | 6% | 3.59 | 3.93 |
| Justin De Fratus | 25 | Philadelphia | 13 | 10.67 | 44 | 11.4% | 18.2% | .233 | 58% | 50% | 0% | 3.37 | 3.03 |
| Brian Rosenberg | Philadelphia | 22 | 25.00 | 106 | 13.2% | 22.6% | .233 | 60% | 38% | 10% | 6.12 | 5.21 | |
| Kyle McClellan | 28 | St. Louis | 16 | 18.67 | 83 | 10.8% | 13.3% | .237 | 66% | 47% | 6% | 5.30 | 5.11 |
| Jean Machi | 29 | San Francisco | 8 | 6.67 | 28 | 3.6% | 14.3% | .238 | 58% | 39% | 14% | 6.75 | 6.28 |
| Luis Valdez | 28 | Chi Cubs | 12 | 14.67 | 67 | 16.4% | 11.9% | .239 | 79% | 48% | 4% | 3.07 | 5.17 |
| Ryan Dempster | 35 | Chi Cubs | 16 | 104.00 | 417 | 6.5% | 19.9% | .241 | 84% | 43% | 5% | 2.25 | 3.46 |
| Sergio Romo | 29 | San Francisco | 69 | 55.33 | 215 | 4.7% | 29.3% | .242 | 91% | 48% | 7% | 1.79 | 2.73 |
