| 2012 NL Leaders | |||||||||||||
| Name | Age | Team | G | IP | TBF | BB% | K% | BABIP | LOB% | GB% | HR/Air | ERA | FIP |
| Chad Qualls | 34 | Pittsburgh | 17 | 13.67 | 58 | 3.4% | 10.3% | .292 | 31% | 55% | 0% | 6.58 | 2.69 |
| Julio Teheran | 22 | Atlanta | 2 | 6.33 | 24 | 4.2% | 20.8% | .278 | 33% | 24% | 0% | 5.69 | 2.02 |
| Travis Blackley | 30 | San Francisco | 4 | 5.00 | 25 | 8.0% | 8.0% | .350 | 33% | 43% | 0% | 9.00 | 3.53 |
| Dustin Moseley | 31 | San Diego | 1 | 5.00 | 22 | 9.1% | 18.2% | .286 | 36% | 53% | 13% | 9.00 | 5.33 |
| Pedro Beato | 26 | NY Mets | 7 | 4.33 | 20 | 10.0% | 25.0% | .333 | 36% | 29% | 11% | 10.39 | 5.21 |
| Christopher Schwinden | 26 | NY Mets | 3 | 8.67 | 46 | 6.5% | 2.2% | .297 | 40% | 50% | 19% | 12.46 | 9.93 |
| Christopher Leroux | Pittsburgh | 10 | 11.33 | 48 | 4.2% | 25.0% | .323 | 40% | 50% | 6% | 5.56 | 2.95 | |
| Jorge De La Rosa | 31 | Colorado | 3 | 10.67 | 53 | 3.8% | 11.3% | .308 | 42% | 34% | 17% | 9.28 | 8.66 |
| Rick Vanden Hurk | Pittsburgh | 4 | 2.67 | 16 | 6.3% | 18.8% | .455 | 43% | 55% | 0% | 13.48 | 3.13 | |
| John Ely | LA Dodgers | 2 | 2.67 | 19 | 21.1% | 15.8% | .750 | 45% | 55% | 0% | 20.22 | 6.50 | |
| Jose Contreras | 41 | Philadelphia | 17 | 13.67 | 56 | 5.4% | 26.8% | .343 | 45% | 55% | 6% | 5.27 | 2.76 |
| Michael Stutes | 26 | Philadelphia | 6 | 5.67 | 29 | 13.8% | 17.2% | .350 | 45% | 20% | 0% | 6.35 | 3.48 |
| Ryan Perry | Washington | 7 | 8.00 | 35 | 5.7% | 8.6% | .357 | 45% | 37% | 11% | 10.13 | 6.38 | |
| Joseph Paterson | Arizona | 6 | 2.67 | 26 | 11.5% | 0.0% | .619 | 46% | 57% | 20% | 37.08 | 16.24 | |
| Francisco Cordero | 37 | Houston | 6 | 5.00 | 32 | 12.5% | 15.6% | .579 | 46% | 41% | 16% | 19.80 | 9.33 |
| Daniel Otero | San Francisco | 12 | 12.33 | 57 | 3.5% | 14.0% | .409 | 50% | 71% | 0% | 5.84 | 2.80 | |
| Vinnie Chulk | 34 | Milwaukee | 7 | 9.00 | 48 | 8.3% | 20.8% | .515 | 52% | 26% | 0% | 10.00 | 2.24 |
| Takashi Saito | 42 | Arizona | 16 | 12.00 | 60 | 8.3% | 18.3% | .351 | 52% | 41% | 16% | 6.75 | 7.13 |
| Joshua Outman | 28 | Colorado | 27 | 40.67 | 185 | 10.8% | 21.6% | .348 | 52% | 48% | 11% | 8.19 | 4.87 |
| Collin McHugh | NY Mets | 8 | 21.33 | 99 | 8.1% | 17.2% | .355 | 53% | 40% | 12% | 7.59 | 5.99 | |
| Enerio Del Rosario | 27 | Houston | 19 | 19.00 | 97 | 7.2% | 11.3% | .446 | 53% | 39% | 2% | 9.00 | 4.07 |
| William Harris | 28 | Colorado | 20 | 17.67 | 89 | 6.7% | 21.3% | .429 | 54% | 32% | 7% | 8.15 | 4.37 |
| Brandon Dickson | 28 | St. Louis | 4 | 6.33 | 32 | 6.3% | 18.8% | .364 | 54% | 52% | 17% | 7.11 | 6.29 |
| Hisanori Takahashi | Pittsburgh | 9 | 8.33 | 39 | 10.3% | 28.2% | .381 | 54% | 46% | 15% | 8.64 | 5.05 | |
| Chris Narveson | 31 | Milwaukee | 2 | 9.00 | 41 | 9.8% | 12.2% | .296 | 54% | 35% | 10% | 7.00 | 6.24 |
| Ross Ohlendorf | 30 | San Diego | 13 | 48.67 | 233 | 10.3% | 16.7% | .342 | 55% | 32% | 6% | 7.58 | 4.94 |
| Michael Ekstrom | 29 | Colorado | 15 | 15.67 | 72 | 2.8% | 12.5% | .370 | 56% | 44% | 3% | 6.32 | 3.19 |
| Livan Hernandez | 37 | Milwaukee | 26 | 36.33 | 156 | 5.1% | 18.6% | .324 | 56% | 44% | 15% | 7.68 | 5.85 |
| Justin Germano | 30 | Chi Cubs | 13 | 64.00 | 296 | 6.4% | 15.2% | .351 | 56% | 46% | 6% | 6.75 | 4.36 |
| Peter Moylan | 34 | Atlanta | 8 | 5.00 | 21 | 9.5% | 9.5% | .133 | 56% | 50% | 12% | 1.80 | 6.13 |
