| 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 |
| Tony Cingrani | Cincinnati | 3 | 5.00 | 22 | 9.1% | 40.9% | .300 | 109% | 60% | 23% | 1.80 | 3.33 | |
| Joshua Stinson | 24 | Milwaukee | 6 | 9.33 | 38 | 13.2% | 7.9% | .207 | 104% | 48% | 6% | 0.96 | 5.49 |
| Tyler Thornburg | Milwaukee | 8 | 22.00 | 95 | 7.4% | 21.1% | .276 | 101% | 44% | 21% | 4.50 | 7.13 | |
| Daniel Runzler | San Francisco | 6 | 3.67 | 15 | 20.0% | 33.3% | .250 | 100% | 33% | 0% | 0.00 | 3.67 | |
| Zach Putnam | 25 | Colorado | 2 | 2.00 | 9 | 11.1% | 0.0% | .429 | 100% | 38% | 0% | 0.00 | 4.63 |
| Christian Garcia | 27 | Washington | 13 | 12.67 | 48 | 4.2% | 31.3% | .231 | 98% | 28% | 10% | 2.13 | 3.76 |
| D.J. Carrasco | NY Mets | 4 | 3.67 | 18 | 0.0% | 16.7% | .333 | 95% | 38% | 23% | 7.36 | 9.39 | |
| Joshua Lindblom | 25 | LA Dodgers | 48 | 47.67 | 197 | 9.1% | 21.8% | .270 | 93% | 39% | 11% | 3.02 | 5.10 |
| Craig Kimbrel | Atlanta | 63 | 62.67 | 231 | 6.1% | 50.2% | .250 | 93% | 50% | 6% | 1.01 | 0.81 | |
| Edward Mujica | 28 | St. Louis | 29 | 26.33 | 97 | 3.1% | 21.6% | .271 | 93% | 51% | 3% | 1.03 | 2.37 |
| Jeff Beliveau | Chi Cubs | 22 | 17.67 | 86 | 14.0% | 19.8% | .327 | 93% | 41% | 15% | 4.58 | 7.09 | |
| Justin Wilson | 25 | Pittsburgh | 8 | 4.67 | 26 | 11.5% | 26.9% | .667 | 92% | 19% | 0% | 1.93 | 2.06 |
| Sergio Romo | 29 | San Francisco | 69 | 55.33 | 215 | 4.7% | 29.3% | .242 | 91% | 48% | 7% | 1.79 | 2.73 |
| Nick Vincent | San Diego | 27 | 26.33 | 105 | 6.7% | 26.7% | .258 | 91% | 40% | 5% | 1.71 | 2.90 | |
| Rob Scahill | Colorado | 6 | 8.67 | 33 | 9.1% | 12.1% | .269 | 90% | 52% | 0% | 1.04 | 3.24 | |
| Juan Perez | 34 | Milwaukee | 10 | 7.00 | 35 | 22.9% | 28.6% | .308 | 90% | 47% | 25% | 5.14 | 7.84 |
| Scott Elbert | 27 | LA Dodgers | 43 | 32.67 | 133 | 9.8% | 21.8% | .286 | 90% | 38% | 5% | 2.20 | 3.83 |
| Joel Hanrahan | 31 | Pittsburgh | 63 | 59.67 | 254 | 14.2% | 26.4% | .230 | 90% | 39% | 9% | 2.71 | 4.48 |
| Miguel Batista | 41 | Atlanta | 5 | 6.00 | 24 | 8.3% | 8.3% | .222 | 89% | 42% | 9% | 3.00 | 5.63 |
| Cory Gearrin | Atlanta | 22 | 20.00 | 80 | 6.3% | 25.0% | .308 | 88% | 58% | 4% | 1.80 | 2.83 | |
| Zach Duke | 29 | Washington | 8 | 13.67 | 56 | 7.1% | 17.9% | .262 | 87% | 40% | 0% | 1.32 | 2.54 |
| Aroldis Chapman | Cincinnati | 68 | 71.67 | 276 | 8.3% | 44.2% | .254 | 87% | 38% | 5% | 1.51 | 1.58 | |
| Kyle McPherson | 25 | Pittsburgh | 10 | 26.33 | 107 | 6.5% | 19.6% | .288 | 87% | 45% | 7% | 2.73 | 4.04 |
| Luke Gregerson | 28 | San Diego | 77 | 71.67 | 294 | 7.1% | 24.5% | .272 | 87% | 51% | 7% | 2.39 | 3.39 |
| Maikel Cleto | 23 | St. Louis | 9 | 9.00 | 41 | 4.9% | 36.6% | .474 | 87% | 32% | 26% | 7.00 | 6.57 |
| Bill Bray | 29 | Cincinnati | 14 | 8.67 | 43 | 32.6% | 16.3% | .222 | 87% | 30% | 13% | 5.19 | 9.36 |
| Matt Albers | 30 | Arizona | 23 | 21.00 | 84 | 8.3% | 22.6% | .245 | 86% | 59% | 13% | 2.57 | 4.32 |
| Jose Valdez | 30 | Houston | 12 | 12.00 | 57 | 14.0% | 17.5% | .306 | 86% | 49% | 5% | 2.25 | 4.54 |
| Stephen Fife | LA Dodgers | 5 | 26.67 | 115 | 10.4% | 17.4% | .303 | 86% | 45% | 4% | 2.70 | 4.18 | |
